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7th Asia-Pacific Workshop on Structural Health Monitoring, APWSHM 2018

作者： Guo, Yapeng Niu, Haowei Li, Shunlong Harbin Institute of Technology School of Transportation Science and Engineering Harbin China Key Lab of Intelligent Disaster Mitigation Ministry of Industrial and Information Technology Harbin China Key Lab of Structures Dynamic Behaviour and Control Ministry of Education Harbin China

ISBN: (纸本)9783000603594

Safety is an inevitable issue in all kinds of construction sites. The most effective way to insure human's safety is wearing safety helmet, thus whether wearing or not is a main problem of safety monitoring. This paper proposed an approach using deep learning-based computer vision techniques to detect workers (i.e., not wearing safety helmet) from image sequences shot by unmanned aerial vehicle (UAV). Firstly training and testing dataset were created using label tools as a size of 300×300. Then a fine-tune method based on single shot multibox detector network was employed to get high accuracy of detection. The effectiveness and accuracy of methods were validated and discussed. Finally, some visualization work has been done for a deeper understanding of the network. © APWSHM 2018. All rights reserved.

关键词： Computer vision

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A Critical Review on BIM Research Process and Future Trends at Home and Abroad

A Critical Review on BIM Research Process and Future Trends ...

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2018 International Conference on Construction and Real Estate Management: Innovative Technology and Intelligent Construction, ICCREM 2018

作者： Chen, Jiaqing Man, Qingpeng Dept. of Construction Management Harbin Institute of Technology Harbin150001 China Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150001 China

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

Based on Web of Science and CNKI databases, this paper analyzes the current status of BIM research by using the method of bibliometrics. In order to screen all BIM-related articles, periodicals with search keywords as "Building Information Model" or "Building Information Modeling" or "BIM" are searched respectively in each database, and exported in EndNote and Refworks formats. Besides, VOSviewer, a document mapping software, is used to analyze the search results and make it visualized. Following the map of analysis for co-authors and keywords both at home and abroad, this paper systematically illustrated the well-known experts, hot areas, and research prospects in BIM research as well as the problems and shortcomings in the existing research. Through the analysis, it can be summarized that (1) BIM has gained increasing importance in the architecture, engineering, and construction industry;(2) The hot topic related to BIM research are focused on mobile and cloud computing, laser scan, virtual reality, and big data. This paper provides important guidance for BIM researchers to better learn about BIM research area. © 2018 American Society of Civil Engineers.

关键词： Construction industry

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Damage Detection in CFRP/GFRP Composite Bar Using Guided Ultrasonic Waves 7

Damage Detection in CFRP/GFRP Composite Bar Using Guided Ult...

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7th Asia-Pacific Workshop on Structural Health Monitoring, APWSHM 2018

作者： Wu, Y. Zhou, W. Xian, G. Key Lab of Structures Dynamic Behavior and Control of Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Harbin Institute of Technology School of Civil Engineering Harbin150090 China

ISBN: (纸本)9783000603594

The CFRP/GFRP composite bar is a multilayered cylindrical structure, in which the CFRP bar is embedded in the GFRP. It has some advantages over the single CFRP or GFRP composite bar, however delamination between the CFRP and GFRP may lead to a loss of composite action, resulting in reduction of stiffness and fatigue life of this composite bar. Due to the inaccessibility and invisibility of the interface between CFRP and GFRP, the interfacial performance monitoring using traditional measurement methods have been proved challenging. In this work, the guided ultrasonic wave based method is proposed to detect the delamination in CFRP/GFRP composite bar. Since the guided ultrasonic wave is generated using the circular piezoelectric wafer attached on the end plane of the bar, the shear lag transfer model is presented first for the piezoelectric wafer mounted on the surface of the composite bar. This model can explain the characteristics of the guided wave generated in the core CFRP and outer GFRP. Subsequently, the finite element analyses are implemented to demonstrate the characteristics of the guided wave propagating in CFRP/GFRP composite bar. Finally, a series of experiments are conducted on the real CFRP/GFRP composite bars, which include the pristine and the damaged ones. The guided wave signals obtained in the experiments are used to analyze the degree and location of the delamination. This study provides an appropriate approach for the long CFRP/GFRP composite bar. © APWSHM 2018. All rights reserved.

关键词： Damage detection

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Experimental study on interface performance of FRP composite connector 7

Experimental study on interface performance of FRP composite...

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7th Asia-Pacific Conference on FRP in structures, APFIS 2019

作者： Wu, X.G. Han, J.C. Yu, S.Y. Tao, X.K. Tang, Y.C. Xing, S.X. Zhang, R.H. Key Lab of Structures Dynamics Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Hebei Construction Material Vocational and Technical College Qinhuangdao Heibei066004 China College of Urban and Rural Construction Zhongkai University of Agriculture and Engineering Guangzhou510006 China Qinhuangdao Municipal Building Material Group Co. Ltd Qinhuangdao Heibei066000 China

ISBN: (纸本)9780648752899

In order to improve the interfacial comprehensive performance of composite wallboard, an experimental study on the interfacial mechanical properties of sandwich exterior wallboard with FRP composite pipes as connectors was carried out. The influence of the number and layout of FRP composite pipe connectors on the shear resistance of the interface was investigated through the experiment of FRP composite pipe reinforced interface extrusion. The ultimate strength, displacement and failure mode of the connectors were determined. The deformation of the connectors and the sliding ability of the interface, the shear distribution of the interface and the shear bonding degree of the interface were investigated. Four interface shear specimens were designed. The characteristics of interface stress stage and ultimate failure mode were investigated. Based on the experimental study, the influence of the layout parameters of the innovative connector on the mechanical properties of the interface is proposed, and the design suggestions to ensure the spatial effect of the interface are put forward. The research work provides a scientific basis for the design of FRP composite pipe connectors. © APFIS 2019. All right reserved.

关键词： Walls (structural partitions)

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Multi-Stakeholder Risk Analysis for Construction Industry Industrialization: A Review

Multi-Stakeholder Risk Analysis for Construction Industry In...

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2018 International Conference on Construction and Real Estate Management: Analysis of Real Estate and the Construction Industry, ICCREM 2018

作者： Xie, Mengping Wang, Yuna Yang, Kaijun Dept. of Construction Management Harbin Institute of Technology Harbin150001 China Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150000 China

ISBN: (数字)9780784481745

ISBN: (纸本)9780784481745

As a new way of building production, construction industry industrialization (CII) involves a variety of project risk. The stakeholders are one of the main factors for the successful implementation of CII. Therefore, it is necessary to analyze the risk of the stakeholders. This study systematically reviews the definitions, characteristic, stakeholders, and the risk analysis of CII. Based on the risks involved in the traditional construction projects, this paper summarizes the core issues of the risk study of the stakeholders in CII. This study attempts to systematically study the risk of CII from the perspective of the stakeholders, and thus forms a complete system and theoretical framework for the analysis risk of the stakeholders in CII. It is hoped that it will be helpful to provide some guidance for deepening the participants' understanding and avoid their related risk as well as providing some help for the understanding of the interaction between follow-up risk factors. © 2018 American Society of Civil Engineers.

关键词： Construction industry

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Construction of Information Management Model of Engineering Project Based on BIM Technology

Construction of Information Management Model of Engineering ...

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2018 International Conference on Construction and Real Estate Management: Innovative Technology and Intelligent Construction, ICCREM 2018

作者： Hua, Yu Wang, Yaowu Dept. of Civil Engineering Harbin Institute of Technology Harbin150001 China Harbin Institute of Technology Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin150001 China

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

As is known to all, the construction project is an extremely complex process. Relying on the syndromes, such as many parties, a large amount of investment, long project cycle, and so on, the project management process has many difficulties. Therefore, information management has always been an important part of engineering project management. Based on the overall objectives and requirements of the project information management, this paper constructs a framework of engineering project information management model based on BIM technology. The model framework consists of three levels, user layer, application layer, and data layer. Each participant enters the management model through the user layer, then selects different applications, and accepts the model data provided by the data layer, so that they can achieve the corresponding target management finally. © 2018 American Society of Civil Engineers.

关键词： Project management

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Experimental investigation of sandwich wall panels with FRP shear connectors 7

Experimental investigation of sandwich wall panels with FRP ...

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7th Asia-Pacific Conference on FRP in structures, APFIS 2019

ISBN: (纸本)9780648752899

关键词： Walls (structural partitions)

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dynamic effect of water penetration on steel corrosion in carbonated mortar: A neutron imaging, electrochemical, and modeling study

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CEMENT 2022年 9卷

作者： Zhidong Zhang Pavel Trtik Fangzhou Ren Thilo Schmid Christopher H. Dreimol Ueli Angst Durability of Engineering Materials Institute for Building Materials ETH Zurich HCP G 31.1 Leopold-Ruzicka-Weg 4 Zurich 8093 Switzerland Laboratory for Neutron Scattering and Imaging (LNS) Paul Scherrer Institut (PSI) Villigen 5232 Switzerland Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Wood Materials Science Institute for Building Materials ETH Zürich Zürich 8093 Switzerland Cellulose and Wood Materials Laboratory EMPA Dübendorf 8600 Switzerland

Carbonation may potentially lead to corrosion of steel bars in reinforced concrete. This concern presents a major barrier against the implementation of sustainable low-clinker cementitious materials in the design of reinforced concrete structures. Various studies have documented the relationship between different equilibrium moisture states in carbonated concrete and the corrosion rate of the embedded steel. However, limited attempts were focused on visually observing the dynamic (time-dependent) behavior of moisture penetration into concrete and the related corrosion state and rate. Moreover, there is a lack of data on the local moisture state in the cementitious matrix in the steel-concrete interfacial zone. In this study, liquid water uptake in carbonated mortar was in-situ and over time monitored by neutron imaging. The corrosion state of embedded steel was monitored by means of electrochemical measurements. This combined experiment revealed that the arrival of the waterfront at the steel surface led to a sharp decrease of the steel potential. The corrosion rate increased from negligibly low values (<1 µm/year) to about 31 µm/year within a couple of minutes. Based on the neutron images, it is concluded that the moisture ingress through the concrete cover is locally affected by the heterogeneity of projected (depth-averaged) porosity distribution, and that large obstacles such as entrapped air have an effect. These observations were further confirmed by numerical simulation results of water transport, which also showed that liquid water permeability of the studied carbonated mortar determined by the inverse analysis is much higher than reported values in the literature. Overall, this study highlights the importance of considering the dynamic and coupled corrosion and moisture transport behavior during the periods which active corrosion can occur in carbonated concrete exposed to cyclic wetting/drying conditions.

关键词： Cement-based materials Carbonation Durability Corrosion Water imbibition Microstructure

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Revision of bolt connection design formulae for standard GB 50005-2017 and a comparison of the lateral resistance between national design codes

Revision of bolt connection design formulae for standard GB ...

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2018 World Conference on Timber Engineering, WCTE 2018

作者： Niu, Shuang Wang, Xiaoting Zhu, Enchun Key Lab. of Structures Dynamic Behaviour and Control Harbin Institute of Technology Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

The current China national standard Code for design of timber structures GB50005-2003 has not been revised for over a decade, and features incapability and shortcomings for the current design practice. To facilitate the revision of the code, theoretical and experimental studies were carried out on lateral resistance of bolt connections. Formulae for the coefficient of effective dowel bearing length were derived employing European Yield Modes (EYM). Test results reveal the applicability of the formulae derived, and the fact that plasticity of the bolts is not fully developed. The resistance partial factors for design were derived so as to obtain equivalent reliability level with current design code. In terms of reliability level, a concise comparison was made between the proposed design formulae for Standard GB 50005-2017 and the European and American codes. © WCTE 2018 Committee.

关键词： Bolts

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Research on a Technical Framework in Smart Construction Based on Big Data

Research on a Technical Framework in Smart Construction Base...

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2018 International Conference on Construction and Real Estate Management: Innovative Technology and Intelligent Construction, ICCREM 2018

作者： Han, Zixin Wang, Yaowu Dept. of Construction Management School of Civil Engineering Harbin Institute of Technology Harbin150000 China Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

Smart construction is an important technology in the process of building a smart city. In recent years, big data has become a hot topic in the whole world. The application of big data technology in smart construction plays a significant role in promoting the construction of new urbanization. The concept and development of smart construction are introduced in this paper. The relationship between big data and smart construction is discussed based on the current development of Chinese construction industry and the difficulties encountered while applying big data technology in smart construction. Finally, the technical framework of big data technology in smart construction is also presented in this paper. © 2018 American Society of Civil Engineers.

关键词： Big data

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