Pub Date : 2023-02-14DOI: 10.30880/ijscet.2023.14.01.018
M. A. Baig, M. Ansari, N. Islam, Mohammad Umair
The existing bridge seismic design guidelines that rely on the ground acceleration in the far fault zone,ignore the potential impact of near fault forward directivity and fling-step effects on the bridge structures. In the current study probabilistic seismic damage evaluation of a continuous four-span box girder bridge under the impact of near-fault forward directivity and fling step effect is studied employing the fragility analysis. The incremental dynamic analysis is used to construct the fragility curves which shows a range of damage states from minor to collapse for the different damage metrics and for the considered peak ground acceleration varying between 0.1g and 1.2g. Damage metrics such displacement pier ductility, rotational pier ductility and displacement of girder are used to develop the fragility curves and the probabilistic seismic damage model. To evaluate the bridge vulnerability, a probabilistic seismic damage assessment is performed using an ensemble of forward directivity and an ensemble of fling-step comprising permanent ground offset. The suggested probability-based earthquake damage framework is anticipated to be a well-versed model able to estimate the seismic damages to the continuous box girder bridges while taking into account the variation of near fault earthquakes. The findings show that, even at low PGA values the forward directivity and the fling-step ground motions represent a significant risk to the bridge.
{"title":"Influence of Near Fault Earthquakes with Forward Directivity and Fling Step on Seismic Response of Steel Box-Girder Bridge","authors":"M. A. Baig, M. Ansari, N. Islam, Mohammad Umair","doi":"10.30880/ijscet.2023.14.01.018","DOIUrl":"https://doi.org/10.30880/ijscet.2023.14.01.018","url":null,"abstract":"The existing bridge seismic design guidelines that rely on the ground acceleration in the far fault zone,ignore the potential impact of near fault forward directivity and fling-step effects on the bridge structures. In the current study probabilistic seismic damage evaluation of a continuous four-span box girder bridge under the impact of near-fault forward directivity and fling step effect is studied employing the fragility analysis. The incremental dynamic analysis is used to construct the fragility curves which shows a range of damage states from minor to collapse for the different damage metrics and for the considered peak ground acceleration varying between 0.1g and 1.2g. Damage metrics such displacement pier ductility, rotational pier ductility and displacement of girder are used to develop the fragility curves and the probabilistic seismic damage model. To evaluate the bridge vulnerability, a probabilistic seismic damage assessment is performed using an ensemble of forward directivity and an ensemble of fling-step comprising permanent ground offset. The suggested probability-based earthquake damage framework is anticipated to be a well-versed model able to estimate the seismic damages to the continuous box girder bridges while taking into account the variation of near fault earthquakes. The findings show that, even at low PGA values the forward directivity and the fling-step ground motions represent a significant risk to the bridge.","PeriodicalId":14418,"journal":{"name":"International Journal of Sustainable Construction Engineering and Technology","volume":"43 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72671534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.30880/ijscet.2023.14.01.012
Azmah Bakhir, A. H. Nawawi, N. Basrah
Most university campus buildings have low occupancy rates and high operating and maintenance costs because they are historically designed to fulfil the needs of specific faculties without any utility value. Real estate resources in universities tend to be undermanaged and misunderstood as overheadcosts by top-level management. The problems are prevailing within Malaysian public universities. Therefore, it is critical to take a more integrated corporate real estate management (CREM) approach, which is appropriate for public institutions with limited autonomy and strict regulatory oversight. This paper aims to determine key themes of CRE strategies and critical components of CREM alignment for successful implementation within an organisation. A comprehensive literature review was done on CREM at higher education institutions between 1990 and 2021. Then, a summary of several important publications was provided. The discussion of several approaches for coordinating CRE and organisational strategies followed. Because there is still adisconnect between the theoretical framework and the real-world implementations by educational administrators, the gap in Malaysia concerning CREM past research was then discovered. The article concludes by recommending a conceptual framework for CREM implementation in public universities in Malaysia that incorporates CRE strategies, alignment, and portfolio management. In order to enjoy a stream of revenues and support their core business operations, public universities can integrate CREM knowledge while managing their properties and resources. The conceptual framework promotes the overall effectiveness of investment in Malaysian higher education and offers helpful information for public institutions and government organisations involved in education.
{"title":"How Can Malaysian Public Universities Make The Most of Their Campus Real Estate? – A Conceptual Framework for Managing Corporate Real Estate","authors":"Azmah Bakhir, A. H. Nawawi, N. Basrah","doi":"10.30880/ijscet.2023.14.01.012","DOIUrl":"https://doi.org/10.30880/ijscet.2023.14.01.012","url":null,"abstract":"Most university campus buildings have low occupancy rates and high operating and maintenance costs because they are historically designed to fulfil the needs of specific faculties without any utility value. Real estate resources in universities tend to be undermanaged and misunderstood as overheadcosts by top-level management. The problems are prevailing within Malaysian public universities. Therefore, it is critical to take a more integrated corporate real estate management (CREM) approach, which is appropriate for public institutions with limited autonomy and strict regulatory oversight. This paper aims to determine key themes of CRE strategies and critical components of CREM alignment for successful implementation within an organisation. A comprehensive literature review was done on CREM at higher education institutions between 1990 and 2021. Then, a summary of several important publications was provided. The discussion of several approaches for coordinating CRE and organisational strategies followed. Because there is still adisconnect between the theoretical framework and the real-world implementations by educational administrators, the gap in Malaysia concerning CREM past research was then discovered. The article concludes by recommending a conceptual framework for CREM implementation in public universities in Malaysia that incorporates CRE strategies, alignment, and portfolio management. In order to enjoy a stream of revenues and support their core business operations, public universities can integrate CREM knowledge while managing their properties and resources. The conceptual framework promotes the overall effectiveness of investment in Malaysian higher education and offers helpful information for public institutions and government organisations involved in education.","PeriodicalId":14418,"journal":{"name":"International Journal of Sustainable Construction Engineering and Technology","volume":"41 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87280502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.30880/ijscet.2023.14.01.024
Y. Astor, Retno Utami, Yasuyuki Nabesima, A. V. R. Sihombing
Pavement conditions could be degraded throughout its service life. Hence, a pavement management system is needed to ensure pavement performance according to its design life. To support a reliable pavement, a pavement condition survey needs to be conducted most effective and practical way. One of the technologies used in pavement condition surveys is the Unmanned Aerial Vehicle (UAV) or known as drone. The use of UAVs for road maintenance will reduce the cost and time and with the 3D model, the accuracy level is at the centimeter level which indicates UAVs are an excellent and promising tool for road work.In this study, a PCI method of pavement condition evaluationwill be used to asses pavement through both manually surveyed and 3D model calculation with the use of Agisoft application. Later on, statistical test will be carried out such as ANOVA and correlation to determine the relationship between pavement condition obtained from two different survey method as well as the comparison in identifying pavement distresss, PCI value and pavement condition. In result, those two methods can identify identical types of damage, with a fairly high percentage of > 60%. While, manual method could identify a higher percentage of degree of severity than 3D model with the help of application. Themanual of pavement condition assessment can identify in more detail than the Agisoft Metashape application. Based on statistical tests,the two methods used show a close and unidirectional relationship.
{"title":"Implementation of UAV for Pavement Functional Performance Assesment","authors":"Y. Astor, Retno Utami, Yasuyuki Nabesima, A. V. R. Sihombing","doi":"10.30880/ijscet.2023.14.01.024","DOIUrl":"https://doi.org/10.30880/ijscet.2023.14.01.024","url":null,"abstract":"Pavement conditions could be degraded throughout its service life. Hence, a pavement management system is needed to ensure pavement performance according to its design life. To support a reliable pavement, a pavement condition survey needs to be conducted most effective and practical way. One of the technologies used in pavement condition surveys is the Unmanned Aerial Vehicle (UAV) or known as drone. The use of UAVs for road maintenance will reduce the cost and time and with the 3D model, the accuracy level is at the centimeter level which indicates UAVs are an excellent and promising tool for road work.In this study, a PCI method of pavement condition evaluationwill be used to asses pavement through both manually surveyed and 3D model calculation with the use of Agisoft application. Later on, statistical test will be carried out such as ANOVA and correlation to determine the relationship between pavement condition obtained from two different survey method as well as the comparison in identifying pavement distresss, PCI value and pavement condition. In result, those two methods can identify identical types of damage, with a fairly high percentage of > 60%. While, manual method could identify a higher percentage of degree of severity than 3D model with the help of application. Themanual of pavement condition assessment can identify in more detail than the Agisoft Metashape application. Based on statistical tests,the two methods used show a close and unidirectional relationship.","PeriodicalId":14418,"journal":{"name":"International Journal of Sustainable Construction Engineering and Technology","volume":"54 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76189490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.30880/ijscet.2023.14.01.019
Batoul Zargar, Hosein Jahangirnia, A. E. Meibodi, Mozhgan Safa
The global energy crisis has increased the need to use renewable energy such as solar energy instead of fossil fuels. The present study aims to model the financing of the photovoltaic industry which is one of the most fundamental challenges that this industry is facing. To fulfill this aim, this study proposed a model based on the opinions of industry experts collected through interviews in the period from January 2021 to August 2021 and validated it by the structural equation modeling method. Based on the results of the research, issues related to the financing challenge of the photovoltaic industry can be examined in 8 clusters, which are; challenging factors, mediating conditions, consequences, government financing strategies, government incentives for the private sector, personal financing strategies, public financing strategies, guarantees, and insurance. The relationship between each of these variables has also been confirmed as research hypotheses.
{"title":"Monitoring The Photovoltaic Industry Financing Challenge in Iran","authors":"Batoul Zargar, Hosein Jahangirnia, A. E. Meibodi, Mozhgan Safa","doi":"10.30880/ijscet.2023.14.01.019","DOIUrl":"https://doi.org/10.30880/ijscet.2023.14.01.019","url":null,"abstract":"The global energy crisis has increased the need to use renewable energy such as solar energy instead of fossil fuels. The present study aims to model the financing of the photovoltaic industry which is one of the most fundamental challenges that this industry is facing. To fulfill this aim, this study proposed a model based on the opinions of industry experts collected through interviews in the period from January 2021 to August 2021 and validated it by the structural equation modeling method. Based on the results of the research, issues related to the financing challenge of the photovoltaic industry can be examined in 8 clusters, which are; challenging factors, mediating conditions, consequences, government financing strategies, government incentives for the private sector, personal financing strategies, public financing strategies, guarantees, and insurance. The relationship between each of these variables has also been confirmed as research hypotheses.","PeriodicalId":14418,"journal":{"name":"International Journal of Sustainable Construction Engineering and Technology","volume":"15 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90378108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.30880/ijscet.2023.14.01.005
Abderrahim Belabid, H. Akhzouz, Hannane Elminor, H. Elminor
Let's imagine a low clay soil or aggregates, lime or cement and fibers; how can we create value with these three materials or rather how can we achieve an affordable, sustainable building with low environmental impact that requires less maintenance. The elimination of steel increases the life span of buildings by avoiding the corrosion of steel through the phenomenon of the concrete carbonation. So what is the proposed mix and with what mode can we build. The objective of this paper is to propose and evaluate a new construction technology: the technology of monolithic structures applied to low-rise buildings. This technology focuses on the valorization of local materials through a modern construction process. Thus, in this paper describestheprocess, propose and analysisthe adequate models in materials and architecture. Finally,itanalyze the feasibility, the ecological and economic profitability of this technology. This construction process uses the same ingredients as traditional buildings, but with innovative approaches in design and execution.
{"title":"Monolithic Structure Technology: A New Construction Process to Enhance Traditional Construction","authors":"Abderrahim Belabid, H. Akhzouz, Hannane Elminor, H. Elminor","doi":"10.30880/ijscet.2023.14.01.005","DOIUrl":"https://doi.org/10.30880/ijscet.2023.14.01.005","url":null,"abstract":"Let's imagine a low clay soil or aggregates, lime or cement and fibers; how can we create value with these three materials or rather how can we achieve an affordable, sustainable building with low environmental impact that requires less maintenance. The elimination of steel increases the life span of buildings by avoiding the corrosion of steel through the phenomenon of the concrete carbonation. So what is the proposed mix and with what mode can we build. The objective of this paper is to propose and evaluate a new construction technology: the technology of monolithic structures applied to low-rise buildings. This technology focuses on the valorization of local materials through a modern construction process. Thus, in this paper describestheprocess, propose and analysisthe adequate models in materials and architecture. Finally,itanalyze the feasibility, the ecological and economic profitability of this technology. This construction process uses the same ingredients as traditional buildings, but with innovative approaches in design and execution.","PeriodicalId":14418,"journal":{"name":"International Journal of Sustainable Construction Engineering and Technology","volume":"45 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90963175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.30880/ijscet.2023.14.01.001
Paramasivam Janarththan, Rasathurai Arunjeyan, N. Sathiparan
Water penetration into masonry walls can occur in the masonry structures during the rainy climate. Water penetration not only causes discoloration or efflorescence but also can be damaging to material property. Eventhough several studies from past literature focus on wet conditions effect on brick masonry, but there is limited study on cement block masonry. The present research aimed to evaluate the effect of wet conditions on the mechanical characteristic of cement block, binder mortar and masonry. Where three types of fine aggregates, namely river sand, lateritic soil and manufactured sand were used for masonry block production. For binding mortar, two mortar classes M2 and M6 according to British Standard European Norm were used. Compression, flexural bending, and splitting tensile tests for blocks and binding mortar were performed in dry and wet conditions. Also, compression, direct shear and bond test were performed on masonry prisms in dry and wet conditions. The results demonstrate that a considerable amount of strength reduction was observed in wet conditions. In wet conditions, cement-soil block masonry showed a higher reduction in compression strength and bond strength, but showed lesser shear strength reduction when compared with the other two masonry types. Overall, cement-river sand block masonry has shown better performance in wet conditions.
{"title":"Effect of Wet Condition and Aggregates Type Used in Cement-Based Blocks on Mechanical Behavior of Masonry","authors":"Paramasivam Janarththan, Rasathurai Arunjeyan, N. Sathiparan","doi":"10.30880/ijscet.2023.14.01.001","DOIUrl":"https://doi.org/10.30880/ijscet.2023.14.01.001","url":null,"abstract":"Water penetration into masonry walls can occur in the masonry structures during the rainy climate. Water penetration not only causes discoloration or efflorescence but also can be damaging to material property. Eventhough several studies from past literature focus on wet conditions effect on brick masonry, but there is limited study on cement block masonry. The present research aimed to evaluate the effect of wet conditions on the mechanical characteristic of cement block, binder mortar and masonry. Where three types of fine aggregates, namely river sand, lateritic soil and manufactured sand were used for masonry block production. For binding mortar, two mortar classes M2 and M6 according to British Standard European Norm were used. Compression, flexural bending, and splitting tensile tests for blocks and binding mortar were performed in dry and wet conditions. Also, compression, direct shear and bond test were performed on masonry prisms in dry and wet conditions. The results demonstrate that a considerable amount of strength reduction was observed in wet conditions. In wet conditions, cement-soil block masonry showed a higher reduction in compression strength and bond strength, but showed lesser shear strength reduction when compared with the other two masonry types. Overall, cement-river sand block masonry has shown better performance in wet conditions.","PeriodicalId":14418,"journal":{"name":"International Journal of Sustainable Construction Engineering and Technology","volume":"93 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90431932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.30880/ijscet.2023.14.01.016
C. C, K. Sasidhar, A. Madhumathi
The traditional building form design or form-making is an intuitive design method that is neither efficient nor competent for energy-efficient façade design. The form-making design approach threatens sustainable development in India. This paper discusses the new tread of form-finding, a process in which the framework is set for parameters to interact. It suggests a performance-based shape grammar (PBSG) generative design method for façade finding and evaluates it as an energy-efficient facade design method for FGM office buildings for India's hot and humid climate.A research method to develop PBSG rules for a given project framework was demonstrated by redesigning a case sample site and evaluating the existing FGM office building in the sample site. The PBSG methods in two stages apply multiple rules, first for form-finding and later for façade plane-finding for energy efficiency.It was observed that the SG resultant generated form was 42% more energy-efficient than the existing design using the same envelope materials, HVAC equipment, development regulations, and context.The outcome of this study provides a framework for a generative design process using PBSG in the early design stages and proves to be an energy-efficient design method for India's hot and humid climate.
{"title":"Performance-based Generative Shape Grammar Method: Energy Efficient Facade Design for Fully Glazed Multi-Storied Office Building - Hot and Humid Climate, Chennai, India","authors":"C. C, K. Sasidhar, A. Madhumathi","doi":"10.30880/ijscet.2023.14.01.016","DOIUrl":"https://doi.org/10.30880/ijscet.2023.14.01.016","url":null,"abstract":"The traditional building form design or form-making is an intuitive design method that is neither efficient nor competent for energy-efficient façade design. The form-making design approach threatens sustainable development in India. This paper discusses the new tread of form-finding, a process in which the framework is set for parameters to interact. It suggests a performance-based shape grammar (PBSG) generative design method for façade finding and evaluates it as an energy-efficient facade design method for FGM office buildings for India's hot and humid climate.A research method to develop PBSG rules for a given project framework was demonstrated by redesigning a case sample site and evaluating the existing FGM office building in the sample site. The PBSG methods in two stages apply multiple rules, first for form-finding and later for façade plane-finding for energy efficiency.It was observed that the SG resultant generated form was 42% more energy-efficient than the existing design using the same envelope materials, HVAC equipment, development regulations, and context.The outcome of this study provides a framework for a generative design process using PBSG in the early design stages and proves to be an energy-efficient design method for India's hot and humid climate.","PeriodicalId":14418,"journal":{"name":"International Journal of Sustainable Construction Engineering and Technology","volume":"58 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86578139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.30880/ijscet.2023.14.01.028
F. S. Yoresta, N. Nugroho
This paper describes an experimental program which examined the flexural strengthening of timber beams (50x50x1000 mm) using cold-formed steel (CFS) plates (0.75 mm thick and 30 mm wide). A total of fifteen specimens were tested in three-point bending scheme with a span-depth ratio of 18:1. The effectiveness of the steel plates was evaluated for different strengthening lengths and number of strengthening layers. Test results showed that maximum load carrying capacity and stiffness of the strengthened beams can be improved by up to around 70% and 40%, respectively, relative to that of control unstrengthened beams. The increase in the percentage gain occurred as increasing strengthening length as well as number of the strengthening layers. Control unstrengthened beams demonstrated linear elastic behavior during the test whereas the strengthened beams tended to undergo a pseudo-ductile behavior. Along with it tensile failure in timber was still observed in the strengthened beams.
{"title":"Strengthening of Timber Beam with Cold-Formed Steel Plates","authors":"F. S. Yoresta, N. Nugroho","doi":"10.30880/ijscet.2023.14.01.028","DOIUrl":"https://doi.org/10.30880/ijscet.2023.14.01.028","url":null,"abstract":"This paper describes an experimental program which examined the flexural strengthening of timber beams (50x50x1000 mm) using cold-formed steel (CFS) plates (0.75 mm thick and 30 mm wide). A total of fifteen specimens were tested in three-point bending scheme with a span-depth ratio of 18:1. The effectiveness of the steel plates was evaluated for different strengthening lengths and number of strengthening layers. Test results showed that maximum load carrying capacity and stiffness of the strengthened beams can be improved by up to around 70% and 40%, respectively, relative to that of control unstrengthened beams. The increase in the percentage gain occurred as increasing strengthening length as well as number of the strengthening layers. Control unstrengthened beams demonstrated linear elastic behavior during the test whereas the strengthened beams tended to undergo a pseudo-ductile behavior. Along with it tensile failure in timber was still observed in the strengthened beams.","PeriodicalId":14418,"journal":{"name":"International Journal of Sustainable Construction Engineering and Technology","volume":"18 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88341426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.30880/ijscet.2023.14.01.003
Jeonghyun Kim, Pilar Bilbao
Since a construction project involves a huge amount of resources, delays in construction have an unfavorable impact on all stakeholders. Due to the large-scale, specialization, and complexity of construction projects, construction delaysare reported globally. Previous quantitative studies mainly through questionnaires have focused on identifying delay factors. However, the identified delay factors show little difference regardless of time and region, thus, a more fundamental study on theroot causes of the delay is needed. Therefore, this study intends to discuss in depth the causes of delay factors identified in previous studies from professionals’ point of view. According to the interview with the experts, schedule delays are caused by factors such as short initial construction periods, errors in design documents, and rework. The effect of construction delays includes not only work quality degradation and increased risk of workplace accidents, but also the professional ethical dilemma ofmanagers. The experts mention that the construction delay can be alleviated with basic measures such as estimating spare construction period, reviewing design documents before work, and thorough quality control. This paper helps in understanding of the identified construction delays and can provide valuable insights in formulating effective strategies to avoid delays in construction projects.
{"title":"Why are the Frequently Reported Delay Factors in Construction Projects Recurring?: A Qualitative Study","authors":"Jeonghyun Kim, Pilar Bilbao","doi":"10.30880/ijscet.2023.14.01.003","DOIUrl":"https://doi.org/10.30880/ijscet.2023.14.01.003","url":null,"abstract":"Since a construction project involves a huge amount of resources, delays in construction have an unfavorable impact on all stakeholders. Due to the large-scale, specialization, and complexity of construction projects, construction delaysare reported globally. Previous quantitative studies mainly through questionnaires have focused on identifying delay factors. However, the identified delay factors show little difference regardless of time and region, thus, a more fundamental study on theroot causes of the delay is needed. Therefore, this study intends to discuss in depth the causes of delay factors identified in previous studies from professionals’ point of view. According to the interview with the experts, schedule delays are caused by factors such as short initial construction periods, errors in design documents, and rework. The effect of construction delays includes not only work quality degradation and increased risk of workplace accidents, but also the professional ethical dilemma ofmanagers. The experts mention that the construction delay can be alleviated with basic measures such as estimating spare construction period, reviewing design documents before work, and thorough quality control. This paper helps in understanding of the identified construction delays and can provide valuable insights in formulating effective strategies to avoid delays in construction projects.","PeriodicalId":14418,"journal":{"name":"International Journal of Sustainable Construction Engineering and Technology","volume":"18 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78015159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.30880/ijscet.2023.14.01.022
Antonius Aldy Winoto, A. F. Roy
Maintenance and repair of the bridge are inevitable in the operation of a bridge to maintain its condition to keep the operation. Indonesia has hundreds of thousands of bridges that are still actively in use. The classic problem with infrastructure management, such as bridges, is that large numbers are generally not balanced with adequate bridge maintenance budgets. Therefore,the strategy of implementing maintenance and repair by preparing priorities becomes the only logical approach. To get a priority scale, a scoring mechanism is needed. The assessment used by the Ministry of Public Works and Public Housing (PUPR) especiallythe Bina Marga field is based on the bridge management and maintenance system, namely Bridge Management System (BMS) 1993. With BMS 1993, the condition of the bridge is represented by the Condition Value (NK) of the bridge. This study is based on existingNK, prediction of NK value in the future. The predicted model developed is with regression models. Regression models are combined with k-fold cross-validation to improve the accuracy rate of the model. The developed model produces regression models for all variables of condition values with a low error percentage that is in the range of MAPE = 10% and RMSE 0.15. Further significance tests with ANOVA are also conducted to test the effect of independent variables on dependent variables, including testing on fit models to show the resulting model does not overfit and/or underfitting.
{"title":"Model of Predicting the Rating of Bridge Conditions in Indonesia with Regression and K-Fold Cross Validation","authors":"Antonius Aldy Winoto, A. F. Roy","doi":"10.30880/ijscet.2023.14.01.022","DOIUrl":"https://doi.org/10.30880/ijscet.2023.14.01.022","url":null,"abstract":"Maintenance and repair of the bridge are inevitable in the operation of a bridge to maintain its condition to keep the operation. Indonesia has hundreds of thousands of bridges that are still actively in use. The classic problem with infrastructure management, such as bridges, is that large numbers are generally not balanced with adequate bridge maintenance budgets. Therefore,the strategy of implementing maintenance and repair by preparing priorities becomes the only logical approach. To get a priority scale, a scoring mechanism is needed. The assessment used by the Ministry of Public Works and Public Housing (PUPR) especiallythe Bina Marga field is based on the bridge management and maintenance system, namely Bridge Management System (BMS) 1993. With BMS 1993, the condition of the bridge is represented by the Condition Value (NK) of the bridge. This study is based on existingNK, prediction of NK value in the future. The predicted model developed is with regression models. Regression models are combined with k-fold cross-validation to improve the accuracy rate of the model. The developed model produces regression models for all variables of condition values with a low error percentage that is in the range of MAPE = 10% and RMSE 0.15. Further significance tests with ANOVA are also conducted to test the effect of independent variables on dependent variables, including testing on fit models to show the resulting model does not overfit and/or underfitting.","PeriodicalId":14418,"journal":{"name":"International Journal of Sustainable Construction Engineering and Technology","volume":"9 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90309332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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