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65th International Conference on Vibroengineering

作者： Xu, Fenqiang Yao, Yunlong Li, Qinghui Shao, Zhiwei Wang, Guisen School of Civil Engineering and Architecture Nanjing Institute of Technology Nanjing211167 China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing210098 China Jiangsu Road Construction Co. Ltd Nanjing210019 China

Pipe piles have been widely used in composite foundation treatment by virtue of the advantages of assembly line production, easy control of pile quality, fast construction, high bearing capacity of single pile and green environmental protection. By introducing elastic cushion in the static load test method of pipe pile composite foundation, and using theoretical analysis and field test to study the change rule of settlement, pile-soil stress ratio and pile top stress of pipe pile composite foundation with different cushion stiffness. It is concluded that it is feasible to replace the sand cushion layer recommended by the current specification with elastic cushion layer. The study shows that the elastic cushion method of static load test of pipe pile composite foundation is closer to the bearing state of real working condition. The elastic cushion has better pile-soil stress adjustment effect, which is more responsive to the stress adjustment effect of actual engineering cushion, and the elastic cushion provides an improved method for the static load test method of composite foundation. Copyright © 2023 Fenqiang Xu, et al.

关键词： Piles

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Using BIM for Optimising Buildings in the Early Design Stages 18

Using BIM for Optimising Buildings in the Early Design Stage...

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18th IBPSA Conference on Building Simulation, BS 2023

作者： Bollez, Manon Klein, Ralf Saelens, Dirk KU Leuven Department of Civil Engineering Building Physics and Sustainable Design Section Kasteelpark Arenberg 40 box 2447 HeverleeBE-3001 Belgium KU Leuven Department of Civil Engineering Construction Technology Cluster Technology Campus Ghent Gebroeders De Smetstraat 1 GhentBE-9000 Belgium EnergyVille Thor Park 8310 GenkBE-3600 Belgium

With regulators making building performance requirements more and more stringent, it becomes crucial to ensure energy efficiency of the construction process at all stages. However, early design stages are underutilised when it comes to identifying problems and adjusting the final design. While Building Energy Modelling (BEM) is becoming more popular for performing energy simulations and estimating energy demand, it is inherently uncertain due to the uncertainty in the underlying input parameters in early design stages. In this paper, the potential of Building Information Modelling (BIM) to enhance the usefulness of BEM and therefore predict energy demand more accurately is investigated. More specifically, the aim of the present paper is to investigate how BIM can be used to analyse the impact of design parameters on the energy performance in the early design stages. We consider uncertainty at different Levels-of-Detail (LOD) and develop a building energy simulation model to analyse how LOD simplifications in early design stages may propagate into inaccurate demand predictions. We export the BIM model to the Industry Foundation Classes (IFC) format and use the ifc2modelica toolchain to convert the IFC representation of the model into a Modelica simulation file. We analyse the data obtained from the simulation by considering the role of uncertainty of input data and how certain parameters could be adjusted to influence thermal and energy performance. © 2023 *** rights reserved.

关键词： Energy efficiency

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Management and Maintenance of Buildings in BIM Environment: Facility Management of Historic Buildings (HBIM) 9th

Management and Maintenance of Buildings in BIM Environment: ...

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9th International Conference on Mobility, IoT and Smart Cities, EAI Mobility IoT 2022

作者： Mésároš, Peter Grazianová, Mária Smetanková, Jana Krajníková, Katarína Behúnová, Annamária Technical University of Kosice Faculty of Civil Engineering Institute of Construction Technology Economics and Management Kosice Slovakia Technical University of Kosice Faculty of Civil Engineering Expert’s Institute in Construction Kosice Slovakia National Infrastructure for Technology Transfer Support in Slovakia II – NITT SK II Bratislava Slovakia Technical University of Košice Faculty of Mining Ecology Process Control and Geotechnologies Institute of Earth Resources Kosice Slovakia

ISBN: (纸本)9783031282249

To ensure the longest and most efficient operation of the building, it is necessary to use the necessary construction equipment correctly and to detect and eliminate all errors and deficiencies in a timely manner. Maintenance of building represents a combination of technical, administrative and managerial activities during the operation of buildings, the priority objective of which is to maintain the required function. Innovative methods and tools supporting the facility management of buildings are increasingly being used in the management and maintenance of buildings. Such innovative technologies also include building information modelling (BIM). BIM provides users with important information and data that help simplify planning, implementation and maintenance of buildings throughout their life cycle. Precisely in the management and maintenance of historical buildings, sufficient data and information are key aspects to eliminate the occurrence of many faults and damage to historical buildings of the monument fund, which is caused by simple neglect of care or inappropriate maintenance. For this purpose, the principles of Heritage Building Information Modelling (HBIM) are increasingly applied in construction practice. As part of the research, will be analysed the current situation in the field of facility management of historic buildings and the current level of knowledge of the term HBIM. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Maintenance

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Sustainable high-strength cement mortar: synergistic of fiber reinforcement and partial aggregate replacement

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Innovative Infrastructure Solutions 2025年第7期10卷 1-11页

作者： Sedeeq, Leena Jaffer Hamad, Ali Jihad Mohsin, Imran Nazar Al-Saffar, Zaid Hazim Dulaimi, Anmar Technical Institute Mosul Northern Technical University Mosul Iraq Construction Materials and Technology Building Technology School of Housing Building and Planning Universiti Sains Malaysia Penang Malaysia Building and Construction Techniques Engineering Department Technical Engineering College of Mosul Northern Technical University Mosul Iraq Technical College of Engineering Duhok Polytechnic University Duhok Iraq Department of Civil Engineering College of Engineering University of Kerbala Karbala Iraq Iraq School of Civil Engineering and Built Environment Liverpool John Moores University Liverpool UK

The construction sector heavily relies on natural resources and significantly impacts environmental degradation, underscoring the urgent need for sustainable building materials. Recent efforts prioritize enhancing the performance of cement-based products while reducing their ecological footprint. Sustainable High-Strength Cement Mortar (SHSCM) has gained prominence due to its superior mechanical properties, yet traditional formulations often rely heavily on non-renewable resources, resulting in substantial carbon emissions. This research addresses the dual objective of optimizing the mechanical properties of SHSCM while promoting sustainability through the innovative use of waste materials. Specifically, this study investigates the incorporation of ceramic waste (CW) as a partial replacement for fine aggregates, alongside the reinforcement of glass fibers (GF), to explore their synergistic effects on the mechanical performance of the mortar. By examining various combinations of CW (10%, 20%, and 30%) and GF (2%, 4%, and 6%). Preliminary results indicate that the inclusion of up to 30% CW not only enhances compressive and flexural strengths but also highlights the challenges posed by increased fiber content on workability. According to the multi criteria decision making (MCDM) framework, that is represented by technique for order of preference by similarity to ideal solution (TOPSIS). This method helps decision-makers assess options by comparing how close they are to the best possible solution and how far they are from the worst possible outcome, providing a well-rounded evaluation of each choice. TOPSIS identified mix M7 (30% CW and 2% GF) was the optimal formulation confirming it achieved the highest compressive and flexural strength while maximizing CW efficiency. This paper ultimately seeks to contribute to the field of sustainable construction materials by demonstrating that effective valorization of waste materials can lead to the development of high-performanc

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Seismic Fragility Assessment of Chloride-Corroded RC Piles in Marine Environments

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Geotechnical and Geological engineering 2025年第6期43卷 1-17页

作者： Shao, Wei Qin, Feilong Shi, Danda Soomro, Mukhtiar Ali Zhou, Pan College of Ocean Science and Engineering Shanghai Maritime University Shanghai China State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin University Tianjin China School of Mechanics and Civil Engineering China University of Mining and Technology Xuzhou China Department of Civil Engineering College of Architecture and Environment Sichuan University Chengdu China

This paper studied the seismic fragility analysis of corroded piles in marine environments under the coupled actions of chloride corrosion and earthquake. The combined models of the pitting and uniform corrosion are considered in the corrosion mechanism of the pile, and the influence of corrosion on the mechanical properties of pile materials ranging from 0 to 100 years is analyzed. According to the low-cycle reciprocating test, the hysteretic curves for different service times are obtained to express the stiffness attenuation of the pile subjected to chloride corrosion. The uncertainty of seismic waves is considered, and the curvature ductility coefficient is used as the damage index to calculate the impact of the earthquake on the marine corroded piles. Then, the vulnerability curves are presented. The results show that under the action of chloride ions corrosion, the reinforcement diameter, yield strength, ultimate strength, and concrete compressive strength of the pile decrease with increasing service time. Therefore, the bending capacity, stiffness, and seismic capacity of the pile decrease with the development of service time. From the seismic fragility curves and surfaces, it is observed that there is a nonlinear growth of failure probability for piles with the increase of peak seismic acceleration and service time under the coupled actions of chloride corrosion and earthquake.

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Operational modal analysis and finite element model updating of a 230 m tall tower

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Structures 2022年 37卷 154-167页

作者： Avci, Onur Alkhamis, Khalid Abdeljaber, Osama Alsharo, Anas Hussein, Mohammed Civil Construction and Environmental Engineering Iowa State University Ames 50011 IA United States Public Works Authority Doha Qatar Department of Building Technology Linnaeus University Sweden Department of Civil and Architectural Engineering Qatar University Doha Qatar

Dynamic response levels are critical for tall and slender civil structures. Studying the dynamic behavior of large civil structures with finite element modeling techniques requires detailed and accurate modeling of structural geometry, material properties, member fixities, connection types, and accompanying assumptions. Still, the finite element model results are approximations that could be away from representing the actual structural behavior. Structures are dynamically tested at their operational conditions to validate the finite element model results. This paper presents Operational Modal Analysis (OMA) and finite element model updating of a tall structure located in the West Bay area of Doha (Qatar). The structure is a reinforced concrete building with shear wall cores situated towards the center of the building plan, which was constructed between 2012 and 2016. With 53 stories above the ground and two stories below ground, the 230 m (755 ft) tall building is being used for residential and hotel purposes. For the finite element model updating and calibration tasks presented in this paper, the authors intentionally introduced drastic model changes for the first two model updates so that the results from the first two attempts guide how to proceed with a more reasonable update for the third calibration of the finite element model. While this is a non-standard technique that represents a specific condition where the initial attempts on the finite element model are very crude approximations, it is a systematized demonstration of how to operate when the structural parameters are sparse or uncertain for modeling purposes. While in theory, the finite element model updates can always be fine-tuned in a way to further decrease the error between the measured and predicted OMA results, in this paper, the authors predominantly focused on the presentation of three finite element model updates to demonstrate the way they have improved the modal assurance criteria plots and l

关键词： civil engineering structures Dynamic testing Experimental Modal Analysis Finite element modeling Operational Modal Analysis Operational modal testing Structural dynamics Structural Health Monitoring (SHM) Vibration testing

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An Overview of Technique Used in Traffic Monitoring System 1

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F-EIR Conference on Environment Concerns and its Remediation, F-EIR 2021

作者： Berwal, Parveen Kaushik, Gopesh Chandra, Kunal Upadhaya, Kirti Gupta, Deepak Goyal, Rajesh Civil Engineering Department Galgotias College of Engineering and Technology Uttar Pradesh Greater Noida201310 India School of Construction Management NICMAR Delhi NCR Bahadurgarh124507 India

ISBN: (数字)9783030962029

ISBN: (纸本)9783030962012

In the recent past, the term traffic congestion has emerged as one of the most brutal challenges to face for the engineers, governments, planners and policy makers in almost every country. With ongoing advancements in social and economic structures, fabricated by vehicles-oriented urban development, they have established congestion as an inevitable reality of urban life. Predominantly there are various factors which play a humongous role towards aggravating this problem some of them are listed as: (Speed, Travel time, Delay, Volume) etc. Subsequently, every research demands exhaustive data collection and based upon that, reaching upon suitable methods to overcome the widely spread problem. Speed has emerged as the most important traffic measurement to identify congestion. This phenomenon has been widely classified into two types (i) Recurring and (ii) Nonrecurring. According to the United States Department of Transportation Federal Highway Administration-alone, nonrecurring congestion is responsible for more than 50% of the total traffic congestion, whereas, recurring congestion contributes for about 40%. Extensive collection of data is aimed to be done at several locations in order to measure the maximum number of traffic characteristics. The main emphasis of this paper is aimed towards understanding the techniques used in recurring urban congestion, its types and methods to curtail it with least available manpower. Literature reviews regarding this problem reveals some interesting insights. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Travel time

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数值流形方法无自锁和沙漏问题的一种单点积分策略

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Acta Mechanica Sinica 2023年第9期39卷 100-113页

作者：张宁郑宏杨亮王熠琛武文安 School of Civil Engineering Qinghai University Qinghai 810016China Key Laboratory of Urban Security and Disasier Engineering Ministry of EducationBeijing University of TechnologyBeijing100124China Agiletech Engineering Consulants Co. LidBejing 100037China National Engineering Lab for Green and Safe Construction Technology in Urban Rail Transit Beijing 100037China

凭借切割运算,数值流形方法(NMM)可通过最简单的规则网格处理任意形状的问题域然而,这通常会生成很多低阶的、形状不规则的单元。因此NMM不但需要大量积分点,而且在几乎不可压缩和弯曲变形占优时常常存在自锁现象.为解决上述问题,本研... 详细信息

凭借切割运算,数值流形方法(NMM)可通过最简单的规则网格处理任意形状的问题域然而,这通常会生成很多低阶的、形状不规则的单元。因此NMM不但需要大量积分点,而且在几乎不可压缩和弯曲变形占优时常常存在自锁现象.为解决上述问题,本研究将建立一个数值稳定的单点积分策略.通过单元的矩,该策略将单元虚功分解为零阶主项和高阶稳定项,进一步通过修正高阶稳定项中的球应变部分和剪切应变部分,达到克服体积自锁和剪切自锁的目的,并用始终非零的稳定项克服沙漏变形.除了积分点更少外,新方法不存在体积自锁、剪切自锁和沙漏模式,因而也具有更高精度.文中数值算例验证了新规则的鲁棒性和精度提升.

关键词：自锁现象数值流形方法规则网格沙漏模式剪切应变精度提升积分点

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18th International Conference on Indoor Air Quality and Climate, INDOOR AIR 2024

作者： Fu, Ting Lai, Qiujia Huang, Di Gao, Shan Liu, Huan Feng, Chi School of Architecture and Urban Planning Chongqing University Chongqing China Key Laboratory of New Technology for Construction of Cities in Mountain Area Ministry of Education Chongqing University Chongqing China School of Civil Engineering Chongqing University Chongqing China

ISBN: (纸本)9798331306816

Mold growth on interior wall surfaces closely correlates with air quality. To investigate how residents’ gender affects fungal composition and diversity, this study utilized swab sampling and high-throughput sequencing to analyze 30 samples from the interior wall surfaces of two university dormitory buildings in Chongqing, China. Results revealed that male-associated fungal communities displayed higher richness, diversity, and evenness than the female counterpart. Ascomycota and Basidiomycota dominated at the phylum level for the samples from the female and male dormitories, respectively. Significant differences in species composition were observed at the genus level, showing greater complexity in male cases. At the amplicon sequence variant level, a notable difference in fungal communities between genders was evident (p © 2024 18th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2024 - Conference Program and Proceedings. All rights reserved.

关键词： College buildings

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Numerical analysis on mechanical properties and failure mode of GFRP-concrete composite beam 11th

Numerical analysis on mechanical properties and failure mode...

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11th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2022

作者： Chen, Zhaohui Xing, Jiajie Song, Chao Qiao, Yunqiang School of Civil Engineering Chongqing University Chongqing China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University Chongqing China Co. Ltd Chongqing China

ISBN: (纸本)9781032345314

Based on the experiments of the GFRP-concrete composite beam, the mechanical property and failure mode of GFRP concrete composite beams are numerically analyzed. Taking into account the anisotropy and stiffness degradation of GFRP, the Hashin criteria is implemented by the VUMAT Model in ABAQUS. The interfacial element by using the bilinear cohesive model is introduced to simulate the bond slip behavior between GFRP flange and concrete slab. The validity of the numerical model is verified by comparing with the results of experimental tests of full GFRP I-profile and GFRP-concrete composite beam. The effects of the strength, thickness, width of concrete slab, and the height of GFRP web on the mechanic performance and failure mode of the composite beam are studied. The results show that the material softening of GFRP and interfacial bond-slip have important influence on the mechanical properties of the composite beam. The increasing strength and thickness of concrete slab would improve the bearing capacity of the composite beam, but excessive compression strength of concrete would lead to longitudinal shear failure of the slab. In addition, the web height of the GFRP profile has a significant effect on the cross-section stress and strain distribution of the composite beam. © 2022 the Author(s).

关键词： Concrete slabs

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