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Development of interaction diagrams of reinforced concrete short columns strengthened by NSM-CFRP strips using finite element method NSM-CFRP带加固钢筋混凝土短柱相互作用图的有限元法编制
IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2022-10-31 DOI: 10.1108/ijbpa-01-2022-0014
Y. Obeidat, Wasim S. Barham, Rawan Abu libdeh
PurposeThe main aim of this study is to examine the behavior of reinforced concrete short columns strengthened using longitudinal near surface mounted (NSM)-carbon fiber reinforced polymer (CFRP) strips.Design/methodology/approachA full 3D-finite element (FE) model was developed using ABAQUS in order to conduct the analysis. The model is first validated based on experimental data available in the literature, and then the effect of concrete compressive strength, number of CFRP strips that are used and the spacing between them were taken in consideration for both concentric and eccentric loading cases. The parametric study specimens were divided into three groups. The first group consisted of unstrengthened columns and served as control specimens. The second group consisted of columns strengthened by longitudinal CFRP strips at two opposite column faces.FindingsThe results of this study are used to develop interaction diagrams for CFRP-strengthened short columns and to develop best-fit equations to estimate the nominal axial load and moment capacities for these strengthened columns. The results showed that the specimens that were strengthened using more longitudinal CFRP strips showed a significant increase in axial load capacity and a significant improvement in the interaction diagram, especially at large load eccentricity values. This result can be justified by the fact that longitudinal strips effectively resist the bending moment that is generated due to eccentric loading. Generally, the process of strengthening using longitudinal strips only has a reasonable effect and it can be typically considered an excellent choice considering the economic aspect when the budget of strengthening is limited.Originality/valueThis research aims at studying the performance of strengthened rectangular reinforced concrete short columns with CFRP strips using FE method, developing interaction diagrams of strengthened columns in order to investigate the effect of different parameters such as compressive strength (20, 30 and 40 MPa), number of CFRP strips (1, 2, 3 and 4) and the spacing between CFRP strips in terms of the ratio of CFRP center point distance to column outside dimension ratio (0.60, 0.70 and 0.80) on the behavior of strengthened RC columns and improving empirical formulas to predict the nominal axial load and moment capacities of strengthened RC columns. These parameters that directly affect short column load carrying capacity are presented in ACI-318 (2014).
目的本研究的主要目的是研究近表面贴附碳纤维增强聚合物(CFRP)纵向带加固钢筋混凝土短柱的性能。设计/方法/方法使用ABAQUS开发了一个全三维有限元(FE)模型来进行分析。该模型首先根据文献中的实验数据进行了验证,然后在同心和偏心荷载情况下考虑了混凝土抗压强度、使用的CFRP条数及其间距的影响。参数研究样本被分为三组。第一组由未加固柱组成,并作为对照试样。第二组由在两个相对的柱面处用纵向CFRP带加固的柱组成。发现本研究的结果用于绘制CFRP加固短柱的相互作用图,并开发最佳拟合方程来估计这些加固柱的标称轴向荷载和弯矩承载力。结果表明,使用更多纵向CFRP带加固的试件显示出轴向承载力的显著提高和相互作用图的显著改善,尤其是在大荷载偏心值下。这一结果可以通过以下事实来证明,即纵向带有效地抵抗由于偏心载荷而产生的弯矩。通常,使用纵向带加固的过程只有合理的效果,并且在加固预算有限的情况下,考虑到经济方面,它通常可以被认为是一个很好的选择。原创性/价值本研究旨在利用有限元方法研究CFRP带加固矩形钢筋混凝土短柱的性能,绘制加固柱的相互作用图,以研究不同参数(如抗压强度(20、30和40MPa)、,CFRP带的数量(1、2、3和4)和CFRP带间距(CFRP中心点距离与柱外尺寸比的比值(0.60、0.70和0.80)对加固RC柱性能的影响,并改进经验公式来预测加固RC柱的标称轴向荷载和弯矩承载力。ACI-318(2014)中介绍了这些直接影响短柱承载能力的参数。
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引用次数: 0
Integrated computational approaches for energy retrofit of historical buildings in extreme climate environments 极端气候环境下历史建筑节能改造的综合计算方法
IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2022-10-18 DOI: 10.1108/ijbpa-03-2022-0044
S. Stellacci, Leonor Domingos, R. Resende
PurposeThe purpose of this research is to test the effectiveness of integrating Grasshopper 3D and measuring attractiveness by a categorical based evaluation technique (M-MACBETH) for building energy simulation analysis within a virtual environment. Set of energy retrofitting solutions is evaluated against performance-based criteria (energy consumption, weight and carbon footprint), and considering the preservation of the cultural value of the building, its architectural and spatial configuration.Design/methodology/approachThis research addresses the building energy performance analysis before and after the design of retrofitting solutions in extreme climate environments (2030–2100). The proposed model integrates data obtained from an advanced parametric tool (Grasshopper) and a multi-criteria decision analysis (M-MACBETH) to score different energy retrofitting solutions against energy consumption, weight, carbon footprint and impact on architectural configuration. The proposed model is tested for predicting the performance of a traditional timber-framed dwelling in a historic parish in Lisbon. The performance of distinct solutions is compared in digitally simulated climate conditions (design scenarios) considering different criteria weights.FindingsThis study shows the importance of conducting building energy simulation linking physical and digital environments and then, identifying a set of evaluation criteria in the analysed context. Architects, environmental engineers and urban planners should use computational environment in the development design phase to identify design solutions and compare their expected impact on the building configuration and performance-based behaviour.Research limitations/implicationsThe unavailability of local weather data (EnergyPlus Weather File (EPW) file), the high time-resource effort, and the number/type of the energy retrofit measures tested in this research limit the scope of this study. In energy simulation procedures, the baseline generally covers a period of thirty, ten or five years. In this research, due to the fact that weather data is unavailable in the format required in the simulation process (.EPW file), the input data in the baseline is the average climatic data from EnergyPlus (2022). Additionally, this workflow is time-consuming due to the low interoperability of the software. Grasshopper requires a high-skilled analyst to obtain accurate results. To calculate the values for the energy consumption, i.e. the values of energy per day of simulation, all the values given per hour are manually summed. The values of weight are obtained by calculating the amount of material required (whose dimensions are provided by Grasshopper), while the amount of carbon footprint is calculated per kg of material. Then this set of data is introduced into M-MACBETH. Another relevant limitation is related to the techniques proposed for retrofitting this case study, all based on wood-fibre boards.Practical implicationsT
本研究的目的是通过基于分类的评估技术(M-MACBETH)来测试集成Grasshopper 3D和测量吸引力的有效性,用于虚拟环境中的建筑能源模拟分析。一套能源改造解决方案是根据基于性能的标准(能源消耗、重量和碳足迹)进行评估的,并考虑到建筑物的文化价值、建筑和空间配置的保护。设计/方法/方法本研究解决了极端气候环境下(2030-2100)改造解决方案设计前后的建筑能源性能分析。所提出的模型集成了从高级参数化工具(Grasshopper)和多标准决策分析(M-MACBETH)获得的数据,根据能耗、重量、碳足迹和对建筑配置的影响对不同的能源改造解决方案进行评分。该模型被用于预测里斯本一个历史悠久的教区的传统木结构住宅的性能。在考虑不同标准权重的数字模拟气候条件(设计场景)下,比较了不同解决方案的性能。本研究显示了将物理环境和数字环境联系起来进行建筑能源模拟的重要性,然后在分析的背景下确定一套评估标准。建筑师、环境工程师和城市规划者应该在开发设计阶段使用计算环境来确定设计解决方案,并比较它们对建筑结构和基于性能的行为的预期影响。研究的限制/意义由于当地天气数据(EnergyPlus天气文件(EPW)文件)的不可获得性、高时间资源的努力以及本研究中测试的能源改造措施的数量/类型限制了本研究的范围。在能源模拟程序中,基线通常涵盖30年、10年或5年的时间。在本研究中,由于天气数据在模拟过程中无法获得所需的格式(。EPW文件),基线中的输入数据是EnergyPlus(2022)的平均气候数据。此外,由于软件的互操作性较低,该工作流非常耗时。Grasshopper需要高技能的分析师来获得准确的结果。为了计算能量消耗的值,即模拟每天的能量值,所有每小时给出的值都是手动求和的。重量的值是通过计算所需材料的数量获得的(其尺寸由Grasshopper提供),而碳足迹的数量是每公斤材料计算的。然后将这组数据引入M-MACBETH。另一个相关的限制与本案例研究提出的改造技术有关,这些技术都是基于木纤维板。本文提出的能源模拟和气候变化适应方法可以应用于其他历史建筑,考虑不同的评估标准和基于上下文的优先级。社会影响鉴于2015年《巴黎协定》和《2030年可持续发展议程》之后预计的极端温度变化,未来几年有必要采取基于环境的建筑环境适应措施。建筑环境包括历史遗迹,它们代表着不可替代的文化遗产和社区身份的因素,需要随着时间的推移而保存下来。独创性/价值这项研究显示了利用物理和数字环境进行建筑能源模拟的重要性。在开发设计阶段,建筑师、工程师和城市规划者应该使用计算环境,根据一套性能标准对设计方案进行排名,并比较对建筑配置和基于性能的行为的预期影响。本研究集成了Grasshopper 3D和M-MACBETH。
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引用次数: 2
Factors influencing the organisational capabilities of the public sector for implementation of building information modelling in construction projects 影响公共部门在建筑项目中实施建筑信息建模的组织能力的因素
IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2022-10-11 DOI: 10.1108/ijbpa-01-2022-0020
A. Yusuf, A. Opawole, N. A. Musa, D. S. Kadiri, E. Ebunoluwa
PurposeThis study examined factors influencing the organisational capabilities of the public sector for building information modelling (BIM) implementation in construction projects with a view to enhancing the performance of public sector projects.Design/methodology/approachThe study adopted a quantitative descriptive analysis that was based on primary data. In total, 198 valid questionnaires obtained from construction professionals within the public sector provided primary quantitative data for the assessment. The respondents provided the responses on the factors which were identified through an in-depth synthesis of literature relating to organisational capabilities of the public sector. Data collected were analysed using descriptive and inferential statistics.FindingsThe findings established that the potential of the public sector to deploy BIM in construction projects is greatly influenced by varying degree of organisational capability attributes with bureaucratic culture (mean score, MS = 3.37), structural complexity (MS = 3.17), lack of skilled and trained staff (MS = 3.12), personnel stability (MS = 3.11), staff cooperation (MS = 3.09) and political constraint (MS = 3.07) ranked highest. Through factor analysis, these and other highly influential factors were grouped into eight components, namely management-related, policy-related, technical-related, attitude-related, work structure-related, work ethic-related, decision-related and feedback-related factors. This grouping reflects the various components of organisational capability attributes which the public sector needs to efficiently develop to benefit from project management paradigm introduced by BIM.Practical implicationsThis study provided information for improving specific capability attributes with respect to human and technical resources as well as other soft infrastructure to support BIM implementation on building projects by the public sector client. The study also serves as a guide for understanding BIM implementation by the public sector in similar socio-political and economic contexts.Originality/valueThis assessment indicates various degrees by which the organisational attributes of public sector have influenced the attributes' capability to implement BIM on construction projects. Thus, findings provide information on areas of improvement for better implementation of BIM by the public sector in project delivery.
目的本研究探讨影响公共部门在建筑项目中实施建筑信息模型(BIM)的组织能力的因素,以期提高公共部门项目的绩效。设计/方法/方法该研究采用了基于原始数据的定量描述性分析。从公共部门的建筑专业人员处获得的198份有效问卷为评估提供了主要的定量数据。受访者提供了通过深入综合有关公共部门组织能力的文献确定的因素的答复。收集的数据使用描述性和推断性统计进行分析。研究结果表明,公共部门在建筑项目中部署BIM的潜力受到不同程度的组织能力属性的极大影响,其中官僚文化(平均得分,MS = 3.37)、结构复杂性(MS = 3.17)、缺乏熟练和训练有素的员工(MS = 3.12)、人员稳定性(MS = 3.11)、员工合作(MS = 3.09)和政治约束(MS = 3.07)排名最高。通过因子分析,将这些因素和其他影响较大的因素分为8个组成部分,即管理相关因素、政策相关因素、技术相关因素、态度相关因素、工作结构相关因素、职业道德相关因素、决策相关因素和反馈相关因素。这个分组反映了公共部门需要有效发展的组织能力属性的各个组成部分,以从BIM引入的项目管理范式中受益。实际意义本研究为提高人力和技术资源以及其他软基础设施方面的具体能力属性提供了信息,以支持公共部门客户在建筑项目中实施BIM。该研究还可以作为公共部门在类似的社会政治和经济背景下理解BIM实施的指南。原创性/价值这一评估表明公共部门的组织属性在不同程度上影响了这些属性在建筑项目中实施BIM的能力。因此,研究结果为公共部门在项目交付中更好地实施BIM提供了改进领域的信息。
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引用次数: 2
Reducing overheating risk in naturally ventilated houses through the design of compressed Earth blocks walls in hot dry climate 在炎热干燥的气候下,通过设计压缩土砌块墙壁来减少自然通风房屋过热的风险
IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2022-10-07 DOI: 10.1108/ijbpa-12-2021-0160
C. Hema, Philbert Nshimiyimana, A. Messan, A. Lawane, G. van Moeseke
PurposeAppropriate thermal properties of walls can lead to the improvement of the indoor environment of buildings especially in countries with low energy availability such as Burkina Faso. In order to benefit from these advantages, the thermal properties must be properly characterized. This paper investigates the impact of the design of single- and double-layer walls based on compressed Earth blocks (CEB) on the risk of indoor overheating.Design/methodology/approachFirst a building has been used as a tool to measure climate data. Then, a software program was used to define an accurate thermal model. Two indices were defined: weighted exceedance hour (WEH) related to the risk of overheating and cyclic thickness (ξ) related to the thermal properties of the walls. The aim is to define the appropriate values of ξ which minimized the WEH. The study also assesses the sensitivity of these thermal properties to occupancy profiles.FindingsThe results indicate the arrangements of the thermal properties that can promote comfortable environments. In single-layer wall buildings, ξ = 2.43 and ξ = 3.93 are the most suitable values to minimize WEH for the room occupied during the day and night, respectively. If a double-layer wall is used, ξ = 1.42 and CEB layer inside is the most suitable for the room occupied during the day, while ξ = 2.43 and CEB outside should be preferred in the case of a room with night occupancy profile.Originality/valueThe findings indicate that occupation patterns at room scale should be systematically considered when dealing with wall design in order to improve the thermal comfort.
目的适当的墙体热性能可以改善建筑的室内环境,尤其是在布基纳法索等能源供应率较低的国家。为了从这些优点中受益,必须正确地表征热性能。本文研究了基于压缩土块(CEB)的单层和双层墙设计对室内过热风险的影响。设计/方法/方法首先,建筑物被用作测量气候数据的工具。然后,使用软件程序来定义精确的热模型。定义了两个指标:与过热风险相关的加权超越小时(WEH)和与墙体热性能相关的循环厚度(ξ)。目的是定义使WEH最小化的ξ的适当值。该研究还评估了这些热特性对占用情况的敏感性。结果表明,热性能的排列可以促进舒适的环境。在单层墙建筑中,ξ=2.43和ξ=3.93分别是使白天和晚上占用的房间的WEH最小化的最合适值。如果使用双层墙,ξ=1.42,内部的CEB层最适合白天占用的房间,而如果房间具有夜间占用情况,则应首选ξ=2.43和外部的CEB。独创性/价值研究结果表明,在处理墙壁设计时,应系统考虑房间规模的占用模式,以提高热舒适性。
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引用次数: 0
Interrelations of slenderness ratio and main design criteria in supertall buildings 超高层建筑长细比与主要设计准则的相互关系
IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2022-10-07 DOI: 10.1108/ijbpa-07-2022-0102
H. E. Ilgın
PurposeTo date, there are no studies in the literature that provide a comprehensive understanding of the interrelationships between the slenderness ratio and the main design criteria in supertall towers (=300 m). In this paper, this important issue was explored using detailed data collected from 75 cases.Design/methodology/approachThis paper was carried out with a comprehensive literature review including the database of the Council on Tall Buildings and Urban Habitat(CTBUH) (CTBUH, 2022), peer-reviewed journals, MSc theses and PhD dissertations, conference proceedings, fact sheets, architectural and structural magazines and other Internet sources. In this study, the case study method was also used to gather and consolidate information about supertall towers to analyze the interrelationships. Cases were 75 supertall buildings in various countries [44 from Asia (37 from China), 16 from the Middle East (6 from Dubai, the United Arab Emirates), 11 from the United States of America and 3 from Russia, 1 from the UK].FindingsThe paper's findings highlighted as follows: (1) for buildings in the height range of 300–399 m, the slenderness ratio was usually between 7 and 7.9 and megatall towers were frequently built at a slenderness ratio of 10–15; (2) the median slenderness ratio of buildings in the 400–599 m height ranges was around 8.6; (3) a trend towards supertall slender buildings (=8) was observed in Asia, the Middle East and North America; (4) residential, office and mixed-use towers had a median slenderness ratio of over 7.5; (5) all building forms were utilized in the construction of slender towers (>8); (6) the medium slenderness ratio was around 8 for supertall buildings constructed with outriggered frame and tube systems; (7) especially concrete towers reached values pushing the limits of slenderness (>10) and (8) since the number of some supertall building groups (e.g. steel towers) was not sufficient, establishing a scientific relationship between aspect ratio and related design criteria was not possible.Originality/valueTo date, there are no studies in the literature that provide a comprehensive understanding of the interrelationships between the slenderness ratio and the main design criteria in supertall towers (=300 m). This important issue was explored using detailed data collected from 75 cases.
迄今为止,文献中还没有研究全面了解超高层塔楼(=300米)的长细比与主要设计标准之间的相互关系。本文通过收集75个案例的详细数据,探讨了这一重要问题。设计/方法/方法本文通过全面的文献综述进行,包括高层建筑和城市人居委员会(CTBUH)的数据库(CTBUH, 2022)、同行评审期刊、硕士论文和博士论文、会议记录、概况介绍、建筑和结构杂志以及其他互联网资源。本研究亦采用个案研究的方法,收集和整合超高层塔楼的相关资料,分析其相互关系。案例包括75座超高层建筑,分布在不同的国家[44座来自亚洲(37座来自中国),16座来自中东(6座来自阿拉伯联合酋长国迪拜),11座来自美国,3座来自俄罗斯,1座来自英国]。研究结果表明:(1)在300 ~ 399 m高度范围内,建筑的长细比通常在7 ~ 7.9之间,超高层塔楼的长细比通常在10 ~ 15之间;(2) 400 ~ 599 m高度范围内建筑长细比中位数约为8.6;(3)在亚洲、中东和北美地区,超高层细长建筑(=8)呈上升趋势;(4)住宅、办公和混合用途塔楼的中位数长细比大于7.5;(5)所有的建筑形式都被用于建造细长的塔(b>8);(6)外触发框架-筒结构超高层建筑的中长细比为8左右;(7)特别是混凝土塔达到了推动长细极限的值(bbb10)和(8)由于一些超高层建筑群(如钢塔)的数量不够,无法在长宽比和相关设计标准之间建立科学的关系。独创性/价值迄今为止,文献中还没有研究对超高层塔(=300米)的长细比与主要设计标准之间的相互关系提供全面的理解。这一重要问题是通过从75个案例中收集的详细数据来探讨的。
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引用次数: 3
Relationship between physical environment and neuropsychological perception in children with Asperger’s disorder 阿斯伯格障碍儿童的物理环境与神经心理感知的关系
IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2022-10-06 DOI: 10.1108/ijbpa-12-2021-0165
Haniyeh Ehsani Far, Siyamak Nayyeri Fallah, Akram Khalili
Purpose This research aims to examine the relationship between the physical environment and neuropsychological perception in children with Asperger’s disorder.Design/methodology/approach This study through mixed qualitative–quantitative approaches conducted strategies including a survey and case study. Accordingly, multiple methods were applied to collect data including semi-structured expert interviews (20 persons) and questionnaires (N = 400). The sampling strategy of questionnaire participants was random clustering and the target population was children with Asperger from Iran Asperger Support Associations. Besides, the sampling strategy for the participants of semi-structured expert interviews was non-random and purposeful. The collected data from the participant’s questionnaires and interviews were analyzed by Porsline and Excel software and content analysis, respectively.Findings Based on the relationship between the physical environment and neuropsychological perception, the results of the research indicate that despite all existing differences between the two spectra of hyper-sensitive and hypo-sensitive behaviors, it is possible to design architectural spaces responding to their common needs and satisfy both spectra.Originality/value This research on to healing aspect is quite new and contributes significant information about health issues in building design. This study tries to derive and examine the supportive characteristics of architectural spaces that integrate special physical and effective designs to improve the healing process of children with Asperger’s disorder.
目的本研究旨在探讨阿斯伯格障碍儿童的物理环境与神经心理感知之间的关系。设计/方法论/方法本研究通过定性-定量混合方法进行策略,包括调查和案例研究。因此,采用多种方法收集数据,包括半结构化专家访谈(20人)和问卷调查(N=400)。问卷参与者的抽样策略是随机聚类,目标人群是来自伊朗阿斯伯格支持协会的阿斯伯格儿童。此外,半结构化专家访谈参与者的抽样策略是非随机和有目的的。从参与者的问卷和访谈中收集的数据分别通过Porsline和Excel软件以及内容分析进行分析。研究结果基于物理环境和神经心理感知之间的关系,研究结果表明,尽管超敏感和低敏感行为的两个光谱之间存在所有差异,但设计符合其共同需求并满足这两个光谱的建筑空间是可能的。独创性/价值这项关于治疗方面的研究是一项非常新的研究,为建筑设计中的健康问题提供了重要信息。本研究试图推导和检验建筑空间的支持性特征,这些特征结合了特殊的物理和有效的设计,以改善阿斯伯格症儿童的治疗过程。
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引用次数: 0
Modeling labor costs using artificial intelligence tools 使用人工智能工具建模劳动力成本
IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2022-10-04 DOI: 10.1108/ijbpa-05-2022-0084
M. H. Momade, S. Durdyev, Saurav Dixit, Shamsuddin Shahid, Abubakar Kori Alkali
PurposeConstruction projects in Malaysia are often delayed and over budget due to heavy reliance on labor. Linear regression (LR) models have been used in most labor cost (LC) studies, which are less accurate than machine learning (ML) tools. Construction management applications have increasingly used ML tools in recent years and have greatly impacted forecasting. The research aims to identify the most influential LC factors using statistical approaches, collect data and forecast LC models for improved forecasts of LC.Design/methodology/approachA thorough literature review was completed to identify LC factors. Experienced project managers were administered to rank the factors based on importance and relevance. Then, data were collected for the six highest ranked factors, and five ML models were created. Finally, five categorical indices were used to analyze and measure the effectiveness of models in determining the performance category.FindingsWorker age, construction skills, worker origin, worker training/education, type of work and worker experience were identified as the most influencing factors on LC. SVM provided the best in comparison to other models.Originality/valueThe findings support data-driven regulatory and practice improvements aimed at improving labor issues in Malaysia, with the possibility for replication in other countries facing comparable problems.
由于严重依赖劳动力,马来西亚的建设项目经常被推迟和超出预算。线性回归(LR)模型已用于大多数劳动力成本(LC)研究,其准确性低于机器学习(ML)工具。近年来,建筑管理应用越来越多地使用机器学习工具,并极大地影响了预测。本研究旨在利用统计方法识别影响最大的LC因素,收集数据并预测LC模型,以改进LC预测。设计/方法/方法完成了全面的文献综述,以确定LC因素。有经验的项目经理被要求根据重要性和相关性对这些因素进行排序。然后,收集排名最高的六个因素的数据,并创建五个ML模型。最后,利用5个分类指标分析和衡量模型在确定绩效类别方面的有效性。发现工人年龄、建筑技能、工人出身、工人培训/教育、工作类型和工人经验被确定为影响LC的最重要因素。与其他模型相比,SVM提供了最好的结果。原创性/价值研究结果支持数据驱动的监管和实践改进,旨在改善马来西亚的劳工问题,并有可能在其他面临类似问题的国家复制。
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引用次数: 1
FE modeling of the effect of conductivity in galvanic corrosion between different types of stainless steel and carbon steel in a structure bolted joint 结构螺栓连接中不同类型不锈钢和碳钢之间电偶腐蚀中导电性影响的有限元建模
IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2022-10-04 DOI: 10.1108/ijbpa-10-2021-0138
Younes Ech Charqy, R. Radouani, M. Essahli
PurposeThis study presents a numerical modeling by the finite element method of galvanic corrosion between the bolt (cathode) and the end plate (anode). The bolt is made of three types of stainless steel: austenitic (SS304L, SS316L), martensitic (SS410, SS420) and duplex (32,101), and the end plate is made of carbon steel (S235JR).Design/methodology/approachFinite element modeling.FindingsThe results obtained show, on the one hand, that this corrosion rate increases as the conductivity increases, on the other hand, the stainless steels having the highest corrosion resistance causes a considerable loss of mass of the end plate and subsequently a decrease in the lifetime of the bolted joint.Originality/valueThe galvanic corrosion of beam to column bolted joint with end plate, used in steel structures, was studied in order to determine the corrosion rate of the end plate and subsequently to predict the total lifetime of the bolted joint.
目的本研究采用有限元方法对螺栓(阴极)和端板(阳极)之间的电偶腐蚀进行了数值模拟。螺栓由奥氏体(SS304L、SS316L)、马氏体(SS410、SS420)和双相(32101)三种类型的不锈钢制成,端板由碳钢(S235JR)制成。设计/方法/方法有限元建模。研究结果表明,一方面,这种腐蚀速率随着电导率的增加而增加,另一方面,具有最高耐腐蚀性的不锈钢会导致端板质量的显著损失,从而降低螺栓接头的寿命。独创性/价值研究了钢结构中使用的带端板的梁柱螺栓连接的电偶腐蚀,以确定端板的腐蚀速率,进而预测螺栓连接的总寿命。
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引用次数: 1
Remote sensing to assess the risk for cultural heritage: forecasting potential collapses due to rainfall in historic fortifications 遥感评估文化遗产风险:预测历史防御工事可能因降雨而坍塌
IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2022-09-29 DOI: 10.1108/ijbpa-03-2022-0040
M. Moreno, R. Ortiz, P. Ortiz
PurposeHeavy rainfall is one of the main causes of the degradation of historic rammed Earth architecture. For this reason, ensuring the conservation thereof entails understanding the factors involved in these risk situations. The purpose of this study is to research three past events in which rainfall caused damage and collapse to historic rammed Earth fortifications in Andalusia in order to analyse whether it is possible to prevent similar situations from occurring in the future.Design/methodology/approachThe three case studies analysed are located in the south of Spain and occurred between 2017 and 2021. The hazard presented by rainfall within this context has been obtained from Art-Risk 3.0 (Registration No. 201999906530090). The vulnerability of the structures has been assessed with the Art-Risk 1 model. To characterise the strength, duration, and intensity of precipitation events, a workflow for the statistical use of GPM and GSMaP satellite resources has been designed, validated, and tested. The strength of the winds has been evaluated from data from ground-based weather stations.FindingsGSMaP precipitation data is very similar to data from ground-based weather stations. Regarding the three risk events analysed, although they occurred in areas with a torrential rainfall hazard, the damage was caused by non-intense rainfall that did not exceed 5 mm/hour. The continuation of the rainfall for several days and the poor state of conservation of the walls seem to be the factors that triggered the collapses that fundamentally affected the restoration mortars.Originality/valueA workflow applied to vulnerability and hazard analysis is presented, which validates the large-scale use of satellite images for past and present monitoring of heritage structure risk situations due to rain.
目的强降雨是造成历史夯筑物退化的主要原因之一。因此,确保其保护需要了解这些风险情况中涉及的因素。本研究的目的是研究过去三次降雨对安达卢西亚历史悠久的夯土防御工事造成破坏和坍塌的事件,以分析是否有可能防止类似情况在未来发生。设计/方法/方法分析的三个案例研究位于西班牙南部,发生在2017年至2021年之间。在这种情况下,降雨带来的危害已从Art Risk 3.0(注册号201999906530090)获得。结构的脆弱性已经用艺术风险1模型进行了评估。为了表征降水事件的强度、持续时间和强度,设计、验证和测试了GPM和GSMaP卫星资源的统计使用工作流程。根据地面气象站的数据对风力进行了评估。FindingsGSMaP降水数据与地面气象站的数据非常相似。关于所分析的三个风险事件,尽管它们发生在有暴雨危险的地区,但破坏是由不超过5毫米/小时的非强降雨造成的。降雨持续了几天,墙壁保护状况不佳,似乎是引发坍塌的因素,从根本上影响了修复砂浆。独创性/价值提出了一种应用于脆弱性和危害分析的工作流程,该工作流程验证了大规模使用卫星图像来监测过去和现在因降雨而造成的遗产结构风险情况。
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引用次数: 3
Scan-to-BIM technique in building maintenance projects: practicing quantity take-off 建筑维修项目中Scan-to-BIM技术:实践量起飞
IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2022-09-22 DOI: 10.1108/ijbpa-06-2022-0097
M. Sing, Sophie, Y.Y. Luk, Ken H.C. Chan, H. Liu, Richard Humphrey
PurposeIn Hong Kong, over 20,000 private residential buildings will be 50 plus years old by 2039. However, building maintenance has not been owners’ popular interest because of the high cost as well as the complexities in justifying whether the quantities and prices of the maintenance works are reasonable. This paper therefore aims to validate the practicality of adopting Scan-to-BIM: Terrestrial Laser Scan (TLS) and Building Information Modelling (BIM) to perform quantity take-offs (QTO) for estimating building maintenance costs.Design/methodology/approachA 64-year-old tenement building was selected to conduct a case study. In this instance, the building had undergone a Scan-to-BIM survey approach to generate QTO for the bills of quantities for external painting works. The Scan-to-BIM approach includes site visit, positioning of scanning equipment, assignment of circular scan routes, point cloud registration and identification of residual error. After that, time, cost and quality data were logged into contrast with QTO on as-built plans for external wall plastering works.FindingsThe “time”, “cost” and “quality” of the Scan-to BIM practice were then examined and compared with the prevailing practices of manual measurements on as-built drawings. As noted from the results, the initial cost of Scan-to BIM is high, owing to the cost of equipment, software and capable available operators. However, the authors identified that the time and cost can be significantly minimised by developing and implementing efficient practices such as preparing a detailed scan plan, equipping modeller with quantity surveying knowledge, using automated object recognition and 5D BIM software packages such as Vico Office and CostX.Practical implicationsThe upshot is that Scan-to-BIM could be one of the measures to advance the clarity in the QTO and estimated price of the maintenance projects.Originality/valueThe practicability of Scan-to-BIM has received limited attention on existing building maintenance project. The Scan-to-BIM approach was examined using a case building of a 64-year-old tenement building. The approach demonstrated in this research study is promised to advance the clarity in the QTO and estimated price of maintenance project.
目标到2039年,香港将有2万多幢私人住宅楼建成50年以上。然而,由于维修工程的成本高昂,以及在证明维修工程的数量和价格是否合理方面存在复杂性,建筑物维修一直不是业主的普遍兴趣。因此,本文旨在验证采用扫描到BIM:地面激光扫描(TLS)和建筑信息建模(BIM)来进行数量统计(QTO)以估计建筑维护成本的实用性。设计/方法/方法选择一栋有64年历史的唐楼进行案例研究。在这种情况下,该建筑采用了扫描到BIM的调查方法,为外部涂装工程的工程量清单生成QTO。扫描到BIM的方法包括现场访问、扫描设备的定位、圆形扫描路线的分配、点云登记和残余误差的识别。之后,将时间、成本和质量数据与外墙抹灰工程竣工计划中的QTO进行对比。发现扫描BIM实践的“时间”、“成本”和“质量”随后进行了检查,并与竣工图上手动测量的主流实践进行了比较。从结果中可以看出,由于设备、软件和有能力的操作员的成本,扫描BIM的初始成本很高。然而,作者发现,通过制定和实施有效的实践,如准备详细的扫描计划、为建模人员配备数量测量知识、,使用自动物体识别和5D BIM软件包,如Vico Office和CostX。实际意义。结果是,扫描BIM可能是提高QTO和维护项目估计价格清晰度的措施之一。独创性/价值扫描到BIM的实用性在现有建筑维护项目中受到的关注有限。扫描BIM方法是使用一栋有64年历史的唐楼的案例建筑进行检查的。本研究中展示的方法有望提高QTO和维护项目估计价格的清晰度。
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引用次数: 1
期刊
International Journal of Building Pathology and Adaptation
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