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A Discrete Event Simulation-Based Analysis of Precast Concrete Supply Chain Strategies Considering Suppliers' Production and Transportation Capabilities

A Discrete Event Simulation-Based Analysis of Precast Concre...

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International Conference on Construction and Real Estate Management 2019: Innovative Construction Project Management and Construction Industrialization, ICCREM 2019

作者： Chen, Shiwei Feng, Kailun Lu, Weizhuo Wang, Yaowu Chen, Xue Wang, Shuo Dept. of Construction Management Harbin Institute of Technology Harbin150000 China Dept. of Civil Environmental and Natural Resources Engineering Lulea Univ. of Technology Lulea97187 Sweden 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 Zhonghuan Information College Tianjin Univ. of Technology Tianjin300380 China

ISBN: (数字)9780784482308

ISBN: (纸本)9780784482308

The production and transportation capabilities of a precast concrete (PC) component supplier have great impact on the construction of a PC building project. In China, the production and transportation capabilities of different PC suppliers can vary greatly, which will influence contractors' selection of PC supply chain strategies. However, previous studies often considered the capabilities of PC suppliers to be ideal and failed to compare different PC supply chain strategies under different levels of suppliers capabilities. This study collects detailed data from a PC building project and uses discrete event simulation (DES) to compare different supply chain strategies under different production and transportation capability levels of PC suppliers. Construction duration, construction cost, and greenhouse gas emissions are selected as indicators to compare three different supply chain strategies: just-in-time, on-site storage, and off-site storage. The strengths and weaknesses of each strategy under different capabilities of PC suppliers are found. The results provides guidance for contractors in selecting supply chain strategies when considering PC suppliers' production and transportation capabilities. © 2019 American Society of Civil Engineers.

关键词： Precast concrete

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Post-fire assessment of mechanical properties of polypropylene-fibered reactive powder concrete using non-destructive testing methods 12th

Post-fire assessment of mechanical properties of polypropyle...

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12th fib International PhD Symposium in Civil Engineering

作者： Abid, Muhammad Hou, Xiaomeng Zheng, Wenzhong Shi, Shuomang Key Lab of Structures Dynamic Behavior and Control 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

ISBN: (纸本)9788001064016

Reactive powder concrete (RPC) is an advanced generation of concrete having superior qualities than traditional types of concretes. However, fire may severely affect its quality and strength. In this paper mechanical properties of RPC containing polypropylene (PP) fibers were studied experimentally after exposure to high temperature. The quality of concrete was also assessed by non-destructive testing (NDTs) such as ultrasonic pulse velocity (UPV) method and resonance frequency (RF) method. dynamic elastic modulus has been determined by available equation from NDTs measurements. The results show that an initial increase in strength was observed up to 300℃. However, a gradual decrease in strength occurred for temperature higher than 300℃. Constitutive relationships have been proposed for structural strength assessment through NDTs. © 2018 Czech Technical University in Prague. All rights reserved.

关键词： Nondestructive examination

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Case study on the Synchronous Swivel of Large-Weight T-rigid Frame Bridge

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IOP Conference Series: Earth and Environmental Science 2020年第5期510卷

作者： Qinghe Wang Guoming Dong Baligasima Patrick Jiaxi Liu School of Civil Engineering Shenyang Jianzhu University Shenyang 110168 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China

Swivel technique has been vividly recognized and generally adopted for the T-rigid frame bridge in practice, and this has been achieved by tensioning the prestressed stranding via the ball hinge at the centre of the rigid frame bridge. Although the technique has been adopted and used, very limited study has been devoted to the feasibility of synchronous swivel for double-swing synchronous swivel T-rigid frame bridges to date. This study aims at analysing the construction control of a synchronous swivel T-rigid frame bridge with the self-weight of 12,000 ton for each wing, and providing simplified procedures to determine the unbalanced weight and friction coefficient of the rotating bridge. This study will provide guidance for the future similar projects.

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Local buckling of stainless steel stub columns with novel octagonal hollow sections

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Engineering structures 2025年 338卷

作者： Zhong, Yukai Jiang, Ke Chen, Man-Tai Su, Andi Zhao, Ou Research Center for Wind Engineering and Engineering Vibration Guangzhou University Guangzhou China School of Civil and Environmental Engineering Nanyang Technological University Singapore Department of Civil and Natural Resources Engineering University of Canterbury Christchurch New Zealand State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai200240 China Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure Department of Civil Engineering Shanghai Jiao Tong University Shanghai200240 China Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

Octagonal hollow section, a novel type of polygonal hollow sections, combines the advantages of traditional circular and rectangular hollow sections while mitigating their limitations, with higher load-carrying capacities over rectangular hollow sections due to smaller plate element widths and better constructability over circular hollow sections owing to multiple flat faces providing operation platforms for welded and bolted connections. The present paper reports experimental and numerical studies on the local buckling behaviour of stainless steel octagonal hollow sections under axial compression. The testing programme included axial compression tests on fifteen stainless steel octagonal hollow section stub column specimens with five different outer cross-section dimensions and three different wall thicknesses, as well as tensile coupon tests and initial local geometric imperfection measurements. In parallel with the testing programme, a numerical modelling programme was carried out, with finite element models developed and validated against the test results and afterwards adopted to carry out parametric studies. The test and numerical data were used to evaluate the applicability of relevant design rules, as specified in the European code, American specification and ASCE standard, to stainless steel octagonal hollow sections. The evaluation results generally revealed that (i) the three sets of codified slenderness limits were unsafe when used for cross-section classification of stainless steel hexagonal hollow sections, (ii) the European code and American specification resulted in overall accurate and consistent cross-section compression resistance predictions for stainless steel octagonal hollow sections, but still with some overly conservative predictions for non-slender cross-sections and slightly unsafe predictions for those at the boundary of non-slender and slender cross-sections, and (iii) the ASCE standard provided overall scattered and inaccurate cross-sec

关键词： Welding codes

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Second order hierarchical partial least squares regression-polynomial chaos expansion for global sensitivity and reliability analyses of high-dimensional models

arXiv

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arXiv 2019年

作者： Bu, Ling-Ze Zhao, Wei Wang, Wei School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic 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 of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

To tackle the curse of dimensionality and multicollinearity problems of polynomial chaos expansion for analyzing global sensitivity and reliability of models with high stochastic dimensions, this paper proposes a novel non-intrusive algorithm called second order hierarchical partial least squares regression-polynomial chaos expansion. The first step of the innovative algorithm is to divide the polynomials into several groups according to their interaction degrees and nonlinearity degrees, which avoids large data sets and reflects the relationship between polynomial chaos expansion and high dimensional model representation. Then a hierarchical regression algorithm based on partial least squares regression is devised for extracting latent variables from each group at different variable levels. The optimal interaction degree and the corresponding nonlinearity degrees are automatically estimated with an improved cross validation scheme. Based on the relationship between variables at two adjacent levels, Sobol’ sensitivity indices can be obtained by a simple post-processing of expansion coefficients. Thus, the expansion is greatly simplified through retaining the important inputs, leading to accurate reliability analysis without requirements of additional model evaluations. Finally, finite element models with three different types of structures verified that the proposed method can greatly improve the computational efficiency compared with the ordinary least squares regression-based method. © 2019, CC BY-NC-SA.

关键词： Digital elevation model

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Damage Detection of Transmission Tower Based on Stochastic Subspace and Statistic Model

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IOP Conference Series: Earth and Environmental Science 2021年第1期687卷

作者： Wang Xingjie Yang Tingting Cao Meigen Zheng Chong Zhou Wensong Pang Yutong Wenzhou Power Supply Company of State Grid Wenzhou 330300 Zhejiang Province China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 Heilongjiang Province China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 Heilongjiang Province China School of Civil Engineering North China University of Technology Beijing 100144 China

During the long service period of the transmission tower, the severe environment, material aging and fatigue effects result in the damage accumulation and resistance fading of the transmission tower, which even lead to the structural failure. In this paper, a stochastic subspace-based damage detection algorithm combined with statistical model is proposed for the damage identification of transmission tower structures through processing and analysing its vibration signals. Based on the structural modal parameters identified from the structural vibration response, the nominal modal parameters are defined. Considering that the Hankel matrixes constructed by the system observability matrix and the system output covariance matrix have the same kernel space, the damage index sensitive to the modal parameters is constructed. In the manuscript, firstly, the damage index establishment method and process of the algorithm are presented; and then the vibration data of transmission tower structure simulation under different damage conditions are obtained through numerical simulations; finally, above data are analysed to obtain the damage identification results of transmission tower. The results show that the method proposed in this work can effectively identify the local damage of transmission tower structure.

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

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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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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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