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Experimental research on the seismic performance of reinforced reactive powder concrete frame joints

Zhendong yu Chongji/Journal of Vibration and Shock 2018年第6期37卷 149-156页

作者： Wang, Dehong Ju, Yanzhong Zheng, Wenzhong Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering and Architecture Northeast Electric Power University Jilin132012 China

To study the seismic behavior of frame joints made of reactive powder concrete with ultrahigh strength, toughness and durability, 4 reinforced reactive powder concrete beam-column joints were tested under cyclic loads simulated seismic load conditions. The failure patterns, seismic bearing capacity, hysteretic characteristics, ductility, energy dissipating, strength and rigidity degeneration of the reactive powder concrete frame joints were analyzed. The test results show that, the shear-cracking strength of the reactive powder concrete specimens is higher, and the development of surface crack exhibits the characteristics of multiple fine cracking and a little concrete spalling, and the specimens remain as an integral whole as the loading *** strength and rigidity degeneration rates are small. The deformation capacity and energy dissipation are well. When the failure is occurring, the shear deformation is the double of that under the peak load, and the averaging equivalent viscous damping coefficient of specimens is 0.137, which is higher than the equivalent viscous damping coefficient of normal and high-strength concrete joints. The use of reactive powder concrete can improve the seismic performances of frame joints, including the shear ductility, energy dissipation capacity and so on, and reduce the stirrup ratio in joint core, which is conducive to the construction. © 2018, Editorial Office of Journal of Vibration and Shock. All right reserved.

关键词： High performance concrete

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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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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 study on seismic performance of reinforced concrete frame columns supported with post-build wing walls

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Open Civil Engineering Journal 2017年 11卷 82-91页

作者： Fan, Yang Ying, Wang Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology Harbin 150090 China

Six specimens of concrete frame columns reinforced by post-build wing walls on the opposite faces were designed and fabricated to investigate their seismic performance. Axial compression ratio was considered as the critical factor and divided into 0.31, 0.36, and 0.40 before reinforcement. HRB400 steel grade was used to the longitudinal bar and the ratio of longitudinal reinforcement divided into 1.23%, 1.05% and 0.82%, stirrup reinforcement ratio was 0.6%, and the stirrups were made by HPB300 steel grade. To meet with requirement of ‘strong shear, weak bending’, the ratio of the shear span to effective depth of columns was equal to 2.4. All specimens were subjected into cyclic reversing load. The testing results showed that wing walls reinforced significantly increased the seismic bearing capacity of the specimens and the wing walls damaged seriously, but the columns were not. The limited drift was ranged from 0.021 to 0.033. The post-build wing walls under horizontal motion may dissipate energy effectively while ensuring that the existing columns without obvious damage under vertical loads and earthquake strong motion. © Fan and Ying;Licensee Bentham Open.

关键词： Anti-seismic reinforcement Axial compression ratio Concrete frame column Energy consumption Post-build wing wall

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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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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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Research on Hoisting Sequence controlling during Assembly Construction

Research on Hoisting Sequence Controlling during Assembly Co...

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2018 International Conference on Construction and Real Estate Management: Sustainable Construction and Prefabrication, ICCREM 2018

作者： Yuan, Zhenmin Wang, Yaowu School of 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 Prev./Mitigation of Civ. Eng. Dis. of Min. Indust./Info. Technol. Harbin150090 China

ISBN: (数字)9780784481738

ISBN: (纸本)9780784481738

Due to increasingly complex structures and higher prefabrication rates, the hoisting order of precast components in fabricated buildings is gradually getting attention. During the assembly construction forbidding precast components on site, there are some influencing factors that interfere with the smooth implementation of a hoisting sequence scheme. This paper identifies and analyzes these factors through literature method, on-site investigation, and expert interview to establish an index system affecting the changes of a hoisting sequence scheme. Then, the index system is illustrated through a case, and the results show that the changes of a hoisting sequence scheme caused by transportation management are more than those caused by construction site management. Finally, this paper also discusses some influencing factors that affecting the changes of a hoisting sequence scheme in the premise of allowing precast components to be stacked on site. © 2018 American Society of Civil Engineers.

关键词： Office buildings

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A Review of the Application of BIM in the Assembly Construction

A Review of the Application of BIM in the Assembly Construct...

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

作者： Zhang, Tianqi Man, Qingpeng 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 Harbin150001 China

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

With the rapid development of computer technology and network technology, the informatization of the architecture engineering construction (AEC) industry is continuously improving. Meanwhile, BIM technology has brought a strong impetus to the development of the construction industry. However, for our country, BIM technology is still in its infancy. The application of BIM technology in the construction industry is still an important issue. Recently, the assembly construction has become the trend of the modern construction industry. By summarizing recent researches on the application of BIM technology in prefabricated building, this paper analyzes the advantages of assembly architecture and BIM technology, then explores the application of BIM technology in fabricated architecture. © 2018 American Society of Civil Engineers.

关键词： Construction industry

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Safety monitoring in construction site based on unmanned aerial vehicle platform with computer vision using transfer learning techniques 7

Safety monitoring in construction site based on unmanned aer...

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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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