Based on the engineering background of weakly cemented roadways and adjacent chambers in Western China, a numerical simulation method was used to examine the changes in stress distribution and increment in the surrounding rock of weakly cemented roadways adjacent to chambers. The results show that the surrounding rock stress of the weakly cemented roadway adjacent to the chambers increases by approximately 30%. The vertical stress of the surrounding rock mainly expands along the vertical direction, and the expansion range is 7–12 times that of the chamber height. The horizontal stress of the surrounding rock mainly expands along the horizontal direction, and the expansion range is 3–6 times that of the chamber width. Based on the support idea of “allowable deformation” + “relief pressure” + “maintaining roadway shape”, the support technology of weakly cemented roadways adjacent to chambers is established with “full section U-shaped steel shed + filling flexible materials between the steel shed and surrounding rock + patching the roof bolt + laying concrete on floor”. An engineering test based on the above support technology was carried out, and it was found that the deformation of the weakly cemented roadway adjacent to the chambers was 0 in 20 days.
{"title":"Influence of Stress Disturbance on the Deformation of Nearby Cemented Roadways following the Excavation of Chambers","authors":"Yueying Zhang, Dongxiao Zhang, Xufei Gong, Wei Zhang, Zihao Liu, Feng Xiong","doi":"10.3390/buildings14010169","DOIUrl":"https://doi.org/10.3390/buildings14010169","url":null,"abstract":"Based on the engineering background of weakly cemented roadways and adjacent chambers in Western China, a numerical simulation method was used to examine the changes in stress distribution and increment in the surrounding rock of weakly cemented roadways adjacent to chambers. The results show that the surrounding rock stress of the weakly cemented roadway adjacent to the chambers increases by approximately 30%. The vertical stress of the surrounding rock mainly expands along the vertical direction, and the expansion range is 7–12 times that of the chamber height. The horizontal stress of the surrounding rock mainly expands along the horizontal direction, and the expansion range is 3–6 times that of the chamber width. Based on the support idea of “allowable deformation” + “relief pressure” + “maintaining roadway shape”, the support technology of weakly cemented roadways adjacent to chambers is established with “full section U-shaped steel shed + filling flexible materials between the steel shed and surrounding rock + patching the roof bolt + laying concrete on floor”. An engineering test based on the above support technology was carried out, and it was found that the deformation of the weakly cemented roadway adjacent to the chambers was 0 in 20 days.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"16 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139443149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-09DOI: 10.3390/buildings14010167
Carlos Arévalo Sarrate, Javier Tarín Martínez, Antonio Lorenzo Lara Galera, Rubén Ángel Galindo Aires
Management systems that are recognized as key tools to improve business management and the results associated with it have spread at the business level during the last 50 years. Regarding Safety Management Systems (SMSs), despite having specific international standards, there are no complete studies that analyze the degree of effectiveness of SMS, and even less in construction, a sector that concentrates a large part of registered labor accidents worldwide. The present investigation is an analysis of SMS effectiveness from an empirical study carried out over 48 months in five countries with a total of more than 23 million work hours between 2009 and 2012. Additionally, it is implied that the impact of SMS implementation in a certain organization must be complemented by a statistical qualitative analysis of its effect on the distribution of accidents. Both analyses are developed in the present study, thus contributing relevant implications when assessing both quantitatively and qualitatively the effects of developing and implementing a health and safety management system in this sector. The findings from this research can contribute to understanding how SMS implementation can help reduce accidents in this industry as well as to enhance SMS implementation in a high-risk sector.
{"title":"Effect of Health and Safety Management Systems in the Construction Sector","authors":"Carlos Arévalo Sarrate, Javier Tarín Martínez, Antonio Lorenzo Lara Galera, Rubén Ángel Galindo Aires","doi":"10.3390/buildings14010167","DOIUrl":"https://doi.org/10.3390/buildings14010167","url":null,"abstract":"Management systems that are recognized as key tools to improve business management and the results associated with it have spread at the business level during the last 50 years. Regarding Safety Management Systems (SMSs), despite having specific international standards, there are no complete studies that analyze the degree of effectiveness of SMS, and even less in construction, a sector that concentrates a large part of registered labor accidents worldwide. The present investigation is an analysis of SMS effectiveness from an empirical study carried out over 48 months in five countries with a total of more than 23 million work hours between 2009 and 2012. Additionally, it is implied that the impact of SMS implementation in a certain organization must be complemented by a statistical qualitative analysis of its effect on the distribution of accidents. Both analyses are developed in the present study, thus contributing relevant implications when assessing both quantitatively and qualitatively the effects of developing and implementing a health and safety management system in this sector. The findings from this research can contribute to understanding how SMS implementation can help reduce accidents in this industry as well as to enhance SMS implementation in a high-risk sector.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"13 2","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139443943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-09DOI: 10.3390/buildings14010165
A. Laouadi, Lili Ji, Zahra Jandaghian, Michael A. Lacasse, L. Wang
Overheating in school buildings can negatively affect the cognitive learning performance of particularly young students whose thermoregulation systems are still developing. However, currently, in schools, issues related to overheating have been addressed by limiting the exposure time to thermal discomfort. In this paper, the development of a general procedure that combines building and bioheat simulations to evaluate overheating risk in schools and generate health-based overheating limit criteria that may be applied in Canadian schools is described. General school building models, having either old or new constructions, were created based on a primary school building and successfully calibrated using field measurements of indoor temperature and humidity and published building energy use intensity data. Three sets of two limit criteria (exposure duration and severity of overheating) that account for the personal exposure conditions of students in primary, middle, and secondary schools were developed by limiting the body dehydration of students during extreme overheating events. Comparing the proposed limit criteria with the hour of exceedance criterion revealed interesting relationships between them, suggesting the proposed limit criteria as a benchmark for the comfort-based criteria, particularly for the more vulnerable primary and middle schools. The proposed procedure with the obtained overheating limit criteria is intended to be applied in any field or simulation study to assess the risk of overheating in similar school buildings under any local prevailing climate.
{"title":"The Development of Health-Based Overheating Limit Criteria for School Buildings","authors":"A. Laouadi, Lili Ji, Zahra Jandaghian, Michael A. Lacasse, L. Wang","doi":"10.3390/buildings14010165","DOIUrl":"https://doi.org/10.3390/buildings14010165","url":null,"abstract":"Overheating in school buildings can negatively affect the cognitive learning performance of particularly young students whose thermoregulation systems are still developing. However, currently, in schools, issues related to overheating have been addressed by limiting the exposure time to thermal discomfort. In this paper, the development of a general procedure that combines building and bioheat simulations to evaluate overheating risk in schools and generate health-based overheating limit criteria that may be applied in Canadian schools is described. General school building models, having either old or new constructions, were created based on a primary school building and successfully calibrated using field measurements of indoor temperature and humidity and published building energy use intensity data. Three sets of two limit criteria (exposure duration and severity of overheating) that account for the personal exposure conditions of students in primary, middle, and secondary schools were developed by limiting the body dehydration of students during extreme overheating events. Comparing the proposed limit criteria with the hour of exceedance criterion revealed interesting relationships between them, suggesting the proposed limit criteria as a benchmark for the comfort-based criteria, particularly for the more vulnerable primary and middle schools. The proposed procedure with the obtained overheating limit criteria is intended to be applied in any field or simulation study to assess the risk of overheating in similar school buildings under any local prevailing climate.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"59 21","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139441611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-09DOI: 10.3390/buildings14010159
R. Abidoye, Albert Agbeko Ahiadu, Mustapha Bangura, C. Adilieme, T. Oyedokun, Abood Khaled Alamoudi
The work readiness of property graduates is the subject of global discourse and is an increasingly critical gap as employers demand professionals with competencies in their fundamental roles and digital technologies. Although these issues have been explored from the perspectives of students, graduates, and employers, the insights of property academics remain unexplored. As such, this study delved into the challenges encountered by property academics in Australia concerning the training of property graduates for the digital age, as well as the efficacy of strategies used to achieve this. The opinions of 22 property academics were gathered through an online questionnaire survey and analysed through mean scores, relative importance index (RII), and exploratory factor analysis (EFA). The profile of respondents suggests that approximately half of them have no more than five years of industry experience, and only 54.5% currently engage with the industry. The most significant challenges include limited funding to procure bespoke software and insufficient time to achieve digital competency. Furthermore, academics cited limited support from the universities as a key challenge, but rated curriculum rigidity as non-pertinent. Regarding strategies, retraining academics for digital proficiency, increased technical support from universities, adopting active learning, and revising curricula to incorporate digital technology are critical. Collaboration with industry partners and increased funding for software procurement also emerged as key external factors. Variations in these perceptions also suggest that older academics are less receptive towards retraining, academics with more industry experience believe that a restructuring of the curricula is required, and smaller institutions require more funding and industry support. The core themes of the proposed strategies also indicate that holistic curricula integration is required to incorporate the perspectives of all stakeholders. Practically, these findings underscore the pivotal role of academics in bridging the skills gap and the interconnected roles of graduates, universities, and industry partners.
{"title":"Preparing Property Graduates for the Digital Age: Challenges and Strategies from the Perspective of Australian Property Educators","authors":"R. Abidoye, Albert Agbeko Ahiadu, Mustapha Bangura, C. Adilieme, T. Oyedokun, Abood Khaled Alamoudi","doi":"10.3390/buildings14010159","DOIUrl":"https://doi.org/10.3390/buildings14010159","url":null,"abstract":"The work readiness of property graduates is the subject of global discourse and is an increasingly critical gap as employers demand professionals with competencies in their fundamental roles and digital technologies. Although these issues have been explored from the perspectives of students, graduates, and employers, the insights of property academics remain unexplored. As such, this study delved into the challenges encountered by property academics in Australia concerning the training of property graduates for the digital age, as well as the efficacy of strategies used to achieve this. The opinions of 22 property academics were gathered through an online questionnaire survey and analysed through mean scores, relative importance index (RII), and exploratory factor analysis (EFA). The profile of respondents suggests that approximately half of them have no more than five years of industry experience, and only 54.5% currently engage with the industry. The most significant challenges include limited funding to procure bespoke software and insufficient time to achieve digital competency. Furthermore, academics cited limited support from the universities as a key challenge, but rated curriculum rigidity as non-pertinent. Regarding strategies, retraining academics for digital proficiency, increased technical support from universities, adopting active learning, and revising curricula to incorporate digital technology are critical. Collaboration with industry partners and increased funding for software procurement also emerged as key external factors. Variations in these perceptions also suggest that older academics are less receptive towards retraining, academics with more industry experience believe that a restructuring of the curricula is required, and smaller institutions require more funding and industry support. The core themes of the proposed strategies also indicate that holistic curricula integration is required to incorporate the perspectives of all stakeholders. Practically, these findings underscore the pivotal role of academics in bridging the skills gap and the interconnected roles of graduates, universities, and industry partners.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"118 21","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139444609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-08DOI: 10.3390/buildings14010151
Jiayan Zheng, Yan Liu, Renwei Luo, Haijing Liu, Zhixiang Zhou, Ji He
To improve the accuracy of concrete crack measurement with a machine vision method in structural health monitoring and in technical status evaluation, a subpixel crack measurement method based on the partial area effect was proposed. (1) First, a pixelwise crack image segmentation method was established through a multi-step process of multi-threshold fusion and morphology operation, and a novel pixel degree crack width calculation method was developed with the extraction of the middle points, the center line and its normal, and the intersection of the center line normal and crack edges. (2) Then, a subpixel algorithm based on the partial area effect was introduced to locate vertical, horizontal, and oblique cracks in subpixel crack edges, and the subpixel crack width could be calculated along the crack center line pixelwise. (3) Finally, the proposed method was verified by indoor concrete beam crack measurement tests with a digital microscope, and the results show that the maximum relative errors of the subpixel width of the horizontal, vertical, and oblique straight cracks measured by the proposed method were 3.06%, 8.97%, and 5.16%, respectively. The absolute error of the crack length was less than 0.30 mm, and the measurement accuracy could reach 0.01 pixels. The subpixel crack measurement method provides a novel possible solution for structural health monitoring.
{"title":"A Subpixel Concrete Crack Measurement Method Based on the Partial Area Effect","authors":"Jiayan Zheng, Yan Liu, Renwei Luo, Haijing Liu, Zhixiang Zhou, Ji He","doi":"10.3390/buildings14010151","DOIUrl":"https://doi.org/10.3390/buildings14010151","url":null,"abstract":"To improve the accuracy of concrete crack measurement with a machine vision method in structural health monitoring and in technical status evaluation, a subpixel crack measurement method based on the partial area effect was proposed. (1) First, a pixelwise crack image segmentation method was established through a multi-step process of multi-threshold fusion and morphology operation, and a novel pixel degree crack width calculation method was developed with the extraction of the middle points, the center line and its normal, and the intersection of the center line normal and crack edges. (2) Then, a subpixel algorithm based on the partial area effect was introduced to locate vertical, horizontal, and oblique cracks in subpixel crack edges, and the subpixel crack width could be calculated along the crack center line pixelwise. (3) Finally, the proposed method was verified by indoor concrete beam crack measurement tests with a digital microscope, and the results show that the maximum relative errors of the subpixel width of the horizontal, vertical, and oblique straight cracks measured by the proposed method were 3.06%, 8.97%, and 5.16%, respectively. The absolute error of the crack length was less than 0.30 mm, and the measurement accuracy could reach 0.01 pixels. The subpixel crack measurement method provides a novel possible solution for structural health monitoring.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"22 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139445549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-08DOI: 10.3390/buildings14010154
Jingxian Liu, Yingyu Wu, Fulin Qu, Hanbing Zhao, Yilin Su
The cement industry’s intricate production process, including kiln heating and fossil fuel use, contributes 5–8% of global CO2 emissions, marking it as a significant carbon emitter in construction. This study focuses on quantifying CO2 capture potential in blended cement systems through the utilisation of phenolphthalein and thermalgravimetric methodologies. Its primary objective is to assess the CO2 absorption capacity of these blended systems’ pastes. Initial evaluation involves calculating the carbon capture capacity within the paste, subsequently extended to estimate CO2 content in the resultant concrete products. The findings indicate that incorporating ground granulated blast-furnace slag (GGBS) or an ettringite-based expansive agent did not notably elevate carbonation depth, irrespective of their fineness. Conversely, the introduction of fly ash (FA) notably augmented the carbonation depth, leading to a substantial 36.4% rise in captured CO2 content. The observed distinctions in carbonation behaviour primarily stem from variances in pore structure, attributable to distinct hydration characteristics between GGBS and FA. Thermal analysis confirms the increased stabilisation of CO2 in FA blends, highlighting the crucial influence of material composition on carbonation and emission reduction. Incorporating both GGBS and FA notably diminishes binder emissions, constituting almost half of PC-concrete emissions. Initially, 60% GGBS shows lower emissions than 50% FA, but when considering CO2 capture, this emission dynamic significantly changes, emphasising the intricate influence of additives on emission patterns. This underscores the complexity of evaluating carbonation-induced emissions in cementitious systems.
水泥行业错综复杂的生产工艺（包括窑炉加热和化石燃料的使用）造成的二氧化碳排放量占全球总量的 5-8%，是建筑业的重要碳排放源。本研究通过利用酚酞法和热重法来量化混合水泥系统中的二氧化碳捕集潜力。其主要目的是评估这些混合体系浆料的二氧化碳吸收能力。初步评估包括计算水泥浆中的碳捕获能力，随后扩展到估算最终混凝土产品中的二氧化碳含量。研究结果表明，掺入磨细高炉矿渣（GGBS）或基于乙曲石的膨胀剂，无论其细度如何，都不会显著提高碳化深度。相反，粉煤灰（FA）的引入则显著提高了碳化深度，使捕获的二氧化碳含量大幅提高了 36.4%。观察到的碳化行为差异主要源于孔隙结构的不同，这可归因于 GGBS 和 FA 之间不同的水化特性。热分析证实了二氧化碳在 FA 混合物中的稳定性提高，突出了材料成分对碳化和减排的重要影响。同时掺入 GGBS 和 FA 可显著减少粘结剂的排放量，几乎占 PC 混凝土排放量的一半。最初，60% 的 GGBS 比 50% 的 FA 排放量低，但当考虑到二氧化碳捕获时，这种排放动态发生了显著变化，强调了添加剂对排放模式的复杂影响。这凸显了评估水泥基系统中碳化引起的排放的复杂性。
{"title":"Assessment of CO2 Capture in FA/GGBS-Blended Cement Systems: From Cement Paste to Commercial Products","authors":"Jingxian Liu, Yingyu Wu, Fulin Qu, Hanbing Zhao, Yilin Su","doi":"10.3390/buildings14010154","DOIUrl":"https://doi.org/10.3390/buildings14010154","url":null,"abstract":"The cement industry’s intricate production process, including kiln heating and fossil fuel use, contributes 5–8% of global CO2 emissions, marking it as a significant carbon emitter in construction. This study focuses on quantifying CO2 capture potential in blended cement systems through the utilisation of phenolphthalein and thermalgravimetric methodologies. Its primary objective is to assess the CO2 absorption capacity of these blended systems’ pastes. Initial evaluation involves calculating the carbon capture capacity within the paste, subsequently extended to estimate CO2 content in the resultant concrete products. The findings indicate that incorporating ground granulated blast-furnace slag (GGBS) or an ettringite-based expansive agent did not notably elevate carbonation depth, irrespective of their fineness. Conversely, the introduction of fly ash (FA) notably augmented the carbonation depth, leading to a substantial 36.4% rise in captured CO2 content. The observed distinctions in carbonation behaviour primarily stem from variances in pore structure, attributable to distinct hydration characteristics between GGBS and FA. Thermal analysis confirms the increased stabilisation of CO2 in FA blends, highlighting the crucial influence of material composition on carbonation and emission reduction. Incorporating both GGBS and FA notably diminishes binder emissions, constituting almost half of PC-concrete emissions. Initially, 60% GGBS shows lower emissions than 50% FA, but when considering CO2 capture, this emission dynamic significantly changes, emphasising the intricate influence of additives on emission patterns. This underscores the complexity of evaluating carbonation-induced emissions in cementitious systems.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"52 2","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139447892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-08DOI: 10.3390/buildings14010157
Zhaoru Yan, Feihong Zheng, Jinsan Ju
The temperature measuring instrument was utilized to monitor the welding temperature field at designated points along steel rectangular hollow sections (RHSs) during welding. A total of 32 temperature monitoring points were established on the four surfaces of the RHS branch. Additionally, the welding process was simulated using finite element software to calculate the temperature distribution. The calculated temperature results were then compared with the experimental results obtained from the temperature measuring instrument. The relative errors between the numerical simulation and the experimental temperature results remained within 10%, indicating a reasonable agreement between the two. Once the temperature field was determined, it was used as an input load to calculate the welding residual stress. The longitudinal and transverse residual stresses were analyzed for two paths on the four surfaces of the RHS-to-RHS Y-shaped connection branch. By analyzing the residual stresses, it is possible to evaluate the structural integrity and performance of the welded RHS connection. The analysis process in this paper is crucial for ensuring the safety and reliability of tubular steel structure projects.
{"title":"Analysis and Experiment on the Welding Temperature Field of Multi-Layer and Multi-Pass for RHS–RHS Y-Connections","authors":"Zhaoru Yan, Feihong Zheng, Jinsan Ju","doi":"10.3390/buildings14010157","DOIUrl":"https://doi.org/10.3390/buildings14010157","url":null,"abstract":"The temperature measuring instrument was utilized to monitor the welding temperature field at designated points along steel rectangular hollow sections (RHSs) during welding. A total of 32 temperature monitoring points were established on the four surfaces of the RHS branch. Additionally, the welding process was simulated using finite element software to calculate the temperature distribution. The calculated temperature results were then compared with the experimental results obtained from the temperature measuring instrument. The relative errors between the numerical simulation and the experimental temperature results remained within 10%, indicating a reasonable agreement between the two. Once the temperature field was determined, it was used as an input load to calculate the welding residual stress. The longitudinal and transverse residual stresses were analyzed for two paths on the four surfaces of the RHS-to-RHS Y-shaped connection branch. By analyzing the residual stresses, it is possible to evaluate the structural integrity and performance of the welded RHS connection. The analysis process in this paper is crucial for ensuring the safety and reliability of tubular steel structure projects.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"40 17","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139448208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-08DOI: 10.3390/buildings14010153
Mohammed Qusay Abdul Sahib, Reza Aghayari, Mohammad Javad Moradi, M. Tahamouli Roudsari
In this paper, the feasibility of strengthening a flat column–slab connection within the carbon fiber reinforced polymer (CFRP) has been investigated through experimental study. The experimental program includes a set of nine reinforced concrete flat slab specimens. Three unaltered specimens served as control slabs, while an additional six samples were strengthened with various CFRP configurations to enhance their shear capacity. The strain distribution, ductility, punching shear resistance, stiffness, and crack formation were studied. The result of experimental studies showed that in the direct method of strengthening in which two layers of unidirectional CFRP sheets were employed in two opposite directions, the ultimate punching shear resistance improved by 64%, 44.7%, and 15.3%, with respect to the location of the column connection, as compared with the control specimens. In the case of using one layer of unidirectional CFRP strips, the punching shear resistance was enhanced by approximately 16% and 39%, considering the configuration of CFRP sheets and the amount of strengthened and adhesive layers used. Following the outcomes of this research, the application of CFRPs in improving the resistance capacity of flat slabs against the punching shear is considerable. The reported outcomes were compared with the latest provisions of ACI to show the efficiency of the presented strengthening. Finally, a parametric study was performed assuming different loading locations to assess the effect of the loading region on the response of RC slabs. Results indicate that approaching the loading location toward the RC slab supports results of an increase in the load-bearing capacity and a reduction in the ductility of the RC slab.
{"title":"Experimental Investigation on the Rehabilitation of RC Flat Slabs Using CFRP Sheets to Enhance Punching Shear Capacity","authors":"Mohammed Qusay Abdul Sahib, Reza Aghayari, Mohammad Javad Moradi, M. Tahamouli Roudsari","doi":"10.3390/buildings14010153","DOIUrl":"https://doi.org/10.3390/buildings14010153","url":null,"abstract":"In this paper, the feasibility of strengthening a flat column–slab connection within the carbon fiber reinforced polymer (CFRP) has been investigated through experimental study. The experimental program includes a set of nine reinforced concrete flat slab specimens. Three unaltered specimens served as control slabs, while an additional six samples were strengthened with various CFRP configurations to enhance their shear capacity. The strain distribution, ductility, punching shear resistance, stiffness, and crack formation were studied. The result of experimental studies showed that in the direct method of strengthening in which two layers of unidirectional CFRP sheets were employed in two opposite directions, the ultimate punching shear resistance improved by 64%, 44.7%, and 15.3%, with respect to the location of the column connection, as compared with the control specimens. In the case of using one layer of unidirectional CFRP strips, the punching shear resistance was enhanced by approximately 16% and 39%, considering the configuration of CFRP sheets and the amount of strengthened and adhesive layers used. Following the outcomes of this research, the application of CFRPs in improving the resistance capacity of flat slabs against the punching shear is considerable. The reported outcomes were compared with the latest provisions of ACI to show the efficiency of the presented strengthening. Finally, a parametric study was performed assuming different loading locations to assess the effect of the loading region on the response of RC slabs. Results indicate that approaching the loading location toward the RC slab supports results of an increase in the load-bearing capacity and a reduction in the ductility of the RC slab.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"60 8","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139446668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-08DOI: 10.3390/buildings14010158
Wei Xu, Shijun Zhao, Weizhao Zhang, Xinbo Zhao
The characterization and understanding of crack evolution in non-uniform geological structures are crucial for predicting the mechanical response of rock-like materials or structures under varying loading conditions. In this study, an improved Peridynamic model with a degree of heterogeneity characterized by random pre-breaking “bonds” coefficients is introduced to capture the intricacies of crack initiation, propagation, and branching behaviors in heterogeneous rock-like materials. MATLAB discrete programs for heterogeneous material models and PD simulation programs based on the FORTRAN language were developed. The effectiveness of the heterogeneous PD model in simulating crack propagation and branching patterns in heterogeneous materials has been verified through dynamic and static (quasi-static) loading cases with pre-notch. The different levels of heterogeneity not only affect the direction of crack propagation but also determine the crack deflection direction and branching patterns. The crack propagation path appears to possess obvious asymmetry in the crack propagation direction. As the load applied continues to increase, the asymmetric multi-crack branching phenomenon will occur. The higher the level of heterogeneity, the more complex the behaviors of crack propagation and branching become. This research provides valuable insights into the interplay of material heterogeneity and crack evolution, offering a foundation for improved numerical simulations and contributing to the broader field of geomechanics.
{"title":"Numerical Simulation of Crack Propagation and Branching Behaviors in Heterogeneous Rock-like Materials","authors":"Wei Xu, Shijun Zhao, Weizhao Zhang, Xinbo Zhao","doi":"10.3390/buildings14010158","DOIUrl":"https://doi.org/10.3390/buildings14010158","url":null,"abstract":"The characterization and understanding of crack evolution in non-uniform geological structures are crucial for predicting the mechanical response of rock-like materials or structures under varying loading conditions. In this study, an improved Peridynamic model with a degree of heterogeneity characterized by random pre-breaking “bonds” coefficients is introduced to capture the intricacies of crack initiation, propagation, and branching behaviors in heterogeneous rock-like materials. MATLAB discrete programs for heterogeneous material models and PD simulation programs based on the FORTRAN language were developed. The effectiveness of the heterogeneous PD model in simulating crack propagation and branching patterns in heterogeneous materials has been verified through dynamic and static (quasi-static) loading cases with pre-notch. The different levels of heterogeneity not only affect the direction of crack propagation but also determine the crack deflection direction and branching patterns. The crack propagation path appears to possess obvious asymmetry in the crack propagation direction. As the load applied continues to increase, the asymmetric multi-crack branching phenomenon will occur. The higher the level of heterogeneity, the more complex the behaviors of crack propagation and branching become. This research provides valuable insights into the interplay of material heterogeneity and crack evolution, offering a foundation for improved numerical simulations and contributing to the broader field of geomechanics.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"53 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139447333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-08DOI: 10.3390/buildings14010152
Yufei Lyu, Lei Zhang, Xin Liu, Xuan Ma
Microclimate is a reflection of the climatic conditions within the scope of human daily activities, so it is closely related to human activities. This paper uses Qingshui Village in Hancheng as the research object and the purpose of this paper was to study the influence mechanism of the traditional street spatial form on microclimate and thermal comfort, emphasizing the use of parameterized design platforms in technical methods to construct performance simulations and obtain relatively optimal solutions that are suitable for the spatial form of rural streets and alleys in the region. We select the Universal Thermal Climate Evaluation Index (UTCI) as the evaluation index for microclimate comfort and construct a performance-driven automatic optimization method for street and alley spaces. The results showed that: (1) When the street is in the northeast-southwest direction, the width is taken in the range of 6.5 m–7.3 m, the height of the building on the north side of the street is about 6.0 m, and the height of the building on the south side of the street is about 5.7 m, the comfort rate can reach up to 33.8%. (2) As for street and alley intersections, the focus remains on retaining their original forms while primarily controlling the scale changes. Within streets, the height of the building in the east-west direction is controlled at 5.6 m–6.1 m, the building in the north-south direction is controlled at 7 m–7.4 m, and street widths are controlled between 5.4 m and 6.3 m, resulting in a comfort level of 32.0%; (3) In alleys, east-west building heights are kept between 4.2 m and 5.5 m, and north-south building heights range from 4.5 m to 5.3 m, with widths at around 4.5 m, resulting in a similar comfort level of 32.0%. The research outcomes offer a scientific foundation for the design, creation, and enhancement of the physical environment of local village streets and alleys.
{"title":"Microclimate-Adaptive Morphological Parametric Design of Streets and Alleys in Traditional Villages","authors":"Yufei Lyu, Lei Zhang, Xin Liu, Xuan Ma","doi":"10.3390/buildings14010152","DOIUrl":"https://doi.org/10.3390/buildings14010152","url":null,"abstract":"Microclimate is a reflection of the climatic conditions within the scope of human daily activities, so it is closely related to human activities. This paper uses Qingshui Village in Hancheng as the research object and the purpose of this paper was to study the influence mechanism of the traditional street spatial form on microclimate and thermal comfort, emphasizing the use of parameterized design platforms in technical methods to construct performance simulations and obtain relatively optimal solutions that are suitable for the spatial form of rural streets and alleys in the region. We select the Universal Thermal Climate Evaluation Index (UTCI) as the evaluation index for microclimate comfort and construct a performance-driven automatic optimization method for street and alley spaces. The results showed that: (1) When the street is in the northeast-southwest direction, the width is taken in the range of 6.5 m–7.3 m, the height of the building on the north side of the street is about 6.0 m, and the height of the building on the south side of the street is about 5.7 m, the comfort rate can reach up to 33.8%. (2) As for street and alley intersections, the focus remains on retaining their original forms while primarily controlling the scale changes. Within streets, the height of the building in the east-west direction is controlled at 5.6 m–6.1 m, the building in the north-south direction is controlled at 7 m–7.4 m, and street widths are controlled between 5.4 m and 6.3 m, resulting in a comfort level of 32.0%; (3) In alleys, east-west building heights are kept between 4.2 m and 5.5 m, and north-south building heights range from 4.5 m to 5.3 m, with widths at around 4.5 m, resulting in a similar comfort level of 32.0%. The research outcomes offer a scientific foundation for the design, creation, and enhancement of the physical environment of local village streets and alleys.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"51 21","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139445751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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