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

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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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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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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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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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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