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Policy Trends and Policy Analysis for the Industrialization of the Construction Industry: A Review

Policy Trends and Policy Analysis for the Industrialization ...

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

作者： Li, Xiaoting Wang, Yuna Geng, Yunpeng Wang, Qian 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 Harbin150000 China Dept. of Architecture and Civil Engineering Harbin Institute of Technology Harbin150001 China

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

Industrialization of the construction industry is the direction of change in the mode of building production, so it is imminent to promote the development of industrialization of the construction industry in China. The Chinese government put forward different policies for the development of industrialization of the construction industry in different stages of industrialization of the construction industry. In this review, we describe current researches on the policy of promoting the industrialization of the construction industry in China, discuss the advantages and disadvantages of nine kinds of research methods, and put forward some policy recommendations to promote the industrialization of buildings. In addition, we provide a framework for policy study on industrialization of the construction industry using policy bibliography. © 2018 American Society of Civil Engineers.

关键词： Construction industry

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A sophisticated simulation for the fracture behavior of concrete material using XFEM

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Earthquake Engineering and Engineering Vibration 2017年第4期16卷 859-881页

作者： Zhai Changhai Wang Xiaomin Kong Jingchang Li Shuang Xie Lili School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of EducationHeilongjiangHarbin 150090China Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China

The development of a powerful numerical model to simulate the fracture behavior of concrete material has long been one of the dominant research areas in earthquake engineering. A reliable model should be able to adequately represent the discontinuous characteristics of cracks and simulate various failure behaviors under complicated loading conditions. In this paper, a numerical formulation, which incorporates a sophisticated rigid-plastic interface constitutive model coupling cohesion softening, contact, friction and shear dilatation into the XFEM, is proposed to describe various crack behaviors of concrete material. An effective numerical integration scheme for accurately assembling the contribution to the weak form on both sides of the discontinuity is introduced. The effectiveness of the proposed method has been assessed by simulating several well-known experimental tests. It is concluded that the numerical method can successfully capture the crack paths and accurately predict the fracture behavior of concrete structures. The influence ofmode-Ⅱ parameters on the mixed-mode fracture behavior is further investigated to better determine these parameters.

关键词： fracture behavior concrete material earthquake engineering interface constitutive model XFEM

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On-Site Safety Uncertainties Assessment of Construction Based on Cloud Model and Fuzzy Sets Theory

On-Site Safety Uncertainties Assessment of Construction Base...

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

作者： Liu, Yongyue Wang, Yaowu Yang, Zhihe Yu, Tao Dept. of Construction Management School of Civil Engineering Harbin Institute of Technology Harbin150090 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 Harbin150090 China Dept. of Construction Management School of Management Harbin Institute of Technology Harbin150001 China

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

Safety uncertainties widely exist in every phase of construction projects, especially during the on-site building stage. To identify different kinds of on-site safety uncertainties, a four-level analytic hierarchy process (AHP) model is proposed based on China's current construction industry standards. Then analyze the influence and frequency of level-4th (L4) factors, synthesized cloud model (SCM) is applied to sampling calculation program, with which both randomness and fuzziness can be jointly considered. Finally, a multi-factor assessment method (MAM) under fuzzy sets theory is used to assess level-3rd (L3), level-2nd (L2), and level-1st (L1) factors of on-site safety system. Such methodology not only avoids the limitation of filling in huge numbers of written documents, but also can realize the dynamic adjustment of system factors, and may significantly decrease the difficulty of on-site safety management and safety inspection. In addition, practical advices are put forward to avoid some limitations of standard. © 2018 American Society of Civil Engineers.

关键词： Fuzzy set theory

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Effect of polymer-based self-healing agent on the gas permeability of cement mortar after compressive loading 11

Effect of polymer-based self-healing agent on the gas permea...

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11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017

作者： Du, Tao Yan, Ke-Ye Zhao, Sheng-Ying Li, Hui Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology 73 Huanghe Road Harbin Heilongjiang150090 China

ISBN: (纸本)9781605953304

Concrete is easily to crack due to its low tensile strength. Once harmful substances ingress through cracks, the service life of concrete will be endangered. The self-healing agent with a high healing efficiency and multiple autonomous is prepared based on pyrogallol and polyethylenimine. This self-healing agent is in liquid state, when the solution is exposed to air, there will be a film formed at the liquid/air interface. This film exhibited well regenerative properties which can be used to seal the cracks of concrete to reduce the risk of ingress of aggressive substances. In this paper, the ratio of the two components of the self-healing agent was investigated to achieve an optimization of strength and generation rate of this film. Then cement mortar specimens of ?100×50 mm are immersed in the self-healing agent under a vacuum environment to let the pores fill with self-healing agent. Thereafter, the discs are subjected to gas permeability test to exam the effects of self-healing agent on the permeability of cement mortar before and after compressive loadings. Results showed that this material can effectively reduce the gas permeability coefficient of cement mortar with micro cracks. Scanning electron microscopy (SEM) results also confirmed the crack barrier effect of this self-healing agent. Through several loading cycles, this self-healing agent also retained a certain self-healing effect in cement matrix, indicating that this self-healing agent appears to be a promising approach to increase concrete durability.

关键词： Cracks

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Comprehensive safety assessment for CFST tied arch bridge subjected to explosion

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Journal of Physics: Conference Series 2019年第2期1168卷

作者： Peng Sun Xiaomeng Hou Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China School of Highway Chang'an University Xi'an 710064 China

Accidental vehicle explosion and car bomb blast causes certain damage to bridge structure, while studies on safety assessment for bridge structures subjected to blast are limited, especially for the concrete filled steel tube(CFST) tied arch bridge(tied arch bridge in short). This study developed a safety assessment index system for CFST tied arch bridge under explosion by the modified analytic hierarchy process(AHP) model based on catastrophe theory. The Jinta bridge was used as a demonstration case for this study and the dynamic responses of tied arch bridge under explosion loading was simulated by numerical simulations. The results show that the proposed system can reflects the safety condition of the tied arch bridge after explosion. The evaluation system presented in this study can serve as an approach for the safety assessment of tied arch bridge and provide the basis for engineering decision-making of bridge structures after explosion accident.

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dynamic constitutive model of Q235B steel and its application in LS-DYNA

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Baozha Yu Chongji/Explosion and Shock Waves 2018年第3期38卷 596-602页

作者： Zhi, Xudong Zhang, Rong Lin, Li Fan, Feng Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology HarbinHeilongjiang150090 China School of Civil Engineering Harbin Institute of Technology HarbinHeilongjiang150090 China College of Civil Engineering and Architecture Harbin University of Science and Technology HarbinHeilongjiang150080 China

In this work we conducted a quasi-static tensile test, a high temperature tensile test and a dynamic tensile test on Q235B steel, the most widely used in steel structures in China, using a multi-functional material testing machine and a split Hopkinson tension bar (SHTB) and, based on the test data obtained, fitted three frequently used material models, i.e. the Cowper-Symonds model, the Johnson-Cook model and the Zerilli-Armstrong model, in LS-DYNA. We then verified their validity by conducting Taylor impact tests. The results showed that Q235B steel was temperature and strain-rate sensitive, that the Cowper-Symonds model was applicable in low velocity impact simulations, that the Johnson-Cook model was suitable for simulations with a wider range of strain-rates, and that the Zerilli-Armstrong model was not recommendable for low velocity impact simulation. © 2018, Editorial Office of Journal of Vibration and Shock. All right reserved.

关键词： Strain rate

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Big-data driven building retrofitting: An integrated Support Vector Machines and Fuzzy C-means clustering method

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IOP Conference Series: Earth and Environmental Science 2020年第4期588卷

作者： Weizhuo Lu Kailun Feng Department of Civil Environmental and Natural Resources Engineering Luleå University of Technology Department of Construction Management Harbin Institute of Technology Harbin 150009 China 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

It has become a mainstream to use physical models to quantify expected energy savings from alternative retrofit methods and technologies. However, they are not suitable for predicting energy use of buildings when detailed and specified input parameters are unavailab.e. The overall purpose of the research is to support the stakeholders in taking decisions on refurbishments options when not all of physical information is availab.e, in order to achieve the Swedish Energy Agency's measurements of near-zero energy buildings. The research will transfer big data from Swedish Energy Performance Certificates for building retrofitting. A Support Vector Machines and Fuzzy C-means clustering (SVM-FCM) integrated machine learning algorithm is used directly to extract the case-specific knowledge from EPC big data regarding building characteristics and energy saving of retrofit measures. It enables to prioritize retrofit measures and compute their expected energy savings for buildings. This proposed data driven method is an attempt of taking advantage of big data for practical building retrofit selection.

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Measurement and comparison of snow density on ground and roof 9th

Measurement and comparison of snow density on ground and roo...

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9th International Structural Engineering and Construction Conference: Resilient structures and Sustainable Construction, ISEC 2017

作者： Qingwen, Zhang Zhicheng, Ren Shiyu, Wang Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)9780996043748

With the intensification of global climate changing, the human and economic losses caused by snowstorms becomes higher and higher. Harbin, located in the north of China, has the geographical advantage of heavy snowfall, the density and the distribution of snow on the ground and roof were measured. In the aspect of snow density, the snow density on ground and roofs were measured. The snow is divided into three kinds, and the range of snow density is roughly determined. By comparing the two kinds of measurements on both fields, the effects of location, snow thickness and temperature on snow density are specified. Also, the differences of snow density on both ground and roof, new snow and old snow are got. The results show that the old snow density is greater than the new snow density. The snow density of the roof area is obviously larger than that of the ground area;the ground snow density increases with the accumulation of snowfall. Copyright © 2017 ISEC Press.

关键词： Snow

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controlled substructure identification of shear structure with virtual control system 11

Controlled substructure identification of shear structure wi...

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11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017

作者： Zhang, Dongyu Li, Hui Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9781605953304

Substructure identification is a powerful tool to identify the parameters of a complex structure. Previously, the authors have developed an inductive substructure identification method for shear structures. However, it was found that the identification accuracy of this method is significantly influenced by certain characteristics of structural responses and, thus, it may not be able to always provide accurate estimation results. To solve this problem, a self-balanced virtual control system (VCS) is introduced into the structure, converting the original substructure identification to a controlled substructure identification problem. By optimally tuning the parameters of the VCS, the dynamic characteristics of the controlled structure can be changed and, thus, the goal of improving substructure identification accuracy is achieved. Finally, a numerical example of 6-story shear structure is utilized to effectiveness of the VCS based controlled substructure identification method.

关键词： Parameter estimation

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Design and validation of a smartphone based wireless structural vibration monitoring system 11

Design and validation of a smartphone based wireless structu...

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11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017

作者： Zhang, Dongyu Tian, Jiadong Li, Hui Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9781605953304

Traditional structural health monitoring (SHM) system usually uses expensive professional sensors, data transmission and data acquisition systems. Thus, only very important structures are affordable to install a SHM system. In recent years, smartphones become very popular, which not only integrate high-performance vibration sensors, but also have powerful data acquisition, processing, storage and transmission capabilities, making it possible to utilize smartphones to carry out some SHM tasks. In this paper, the authors developed a software that can easily convert several android based smartphones into a wireless structural vibration monitoring system. The software consists of a server program and a client program. The smart phone installing the server program can remotely control the smartphones installing the client program via local WIFI network to perform the tasks of network timesynchronization and measuring structural responses. First, the architecture of this program is introduced in detail. Then, the time synchronizing algorithm for all client nodes in the software is discussed. Next, the accuracy of time synchronization of the smartphone based wireless sensing system is validated through an experiment. Finally, a shaking table experiment is conducted, the results of which demonstrate that the smartphone based wireless structural vibration monitoring system can quite accurately identify the modal parameters of the tested structure.

关键词： Smartphones

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