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8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016

作者： Xiao, Yanrong Xian, Guijun Li, Hui Key Lab of Structural Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Harbin150090 China

ISBN: (纸本)9789881448026

FRP (fiber reinforced polymer) has taken advantages of the fiber reinforcement and resin matrix, possessing excellent mechanical properties and corrosive resistances, even in harsh environments. The lack of the knowledge of the durability performances of FRPs in various environmental conditions and the related degradation mechanisms of FRPs leads to significantly conservative design. Water ingress plays a critical effect on the durability of FRP, due to susceptibility of the bond between the fibers and resin matrices. In the present paper, molecular dynamics technique was used to model the moisture effect on the fiber-resin bond. The bonding performances of the epoxy on carbon fibers under dry and wet conditions were simulated. Free energy profiles were calculated to quantify interfacial adhesion. As shown from the decline of binding free energy, the water ingress led to remarkable deterioration of the fiber bonding to the resin matrix. The study is expected to be helpful for both the development of durable FRPs, and to predict the service life of a FRP subjected to hydrothermal aging accurately. Copyright © 2016 Department of Civil and Environmental Engineering & Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University.

关键词： Molecular dynamics

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Bayesian system identification based on hierarchical sparse Bayesian learning and gibbs sampling with application to structural damage assessment

arXiv

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arXiv 2017年

作者： Huang, Yong Beck, James L. Li, Hui Key Lab of Structural Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin China Division of Engineering and Applied Science California Institute of Technology CA United States

Bayesian system identification has attracted substantial interest in recent years for inferring structural models based on measured dynamic response from a structural dynamical system. The focus in this paper is Bayesian system identification based on noisy incomplete modal data where we can impose spatially-sparse stiffness changes when updating a structural model. To this end, based on a similar hierarchical sparse Bayesian learning model from our previous work, we propose two Gibbs sampling algorithms. The algorithms differ in their strategies to deal with the posterior uncertainty of the equation-error precision parameter, but both sample from the conditional posterior probability density functions (PDFs) for the structural stiffness parameters and system modal parameters. The effective dimension for the Gibbs sampling is low because iterative sampling is done from only three conditional posterior PDFs that correspond to three parameter groups, along with sampling of the equation-error precision parameter from another conditional posterior PDF in one of the algorithms where it is not integrated out as a "nuisance" parameter. A nice feature from a computational perspective is that it is not necessary to solve a nonlinear eigenvalue problem of a structural model. The effectiveness and robustness of the proposed algorithms are illustrated by applying them to the IASE-ASCE Phase II simulated and experimental benchmark studies. The goal is to use incomplete modal data identified before and after possible damage to detect and assess spatially-sparse stiffness reductions induced by any damage. Our past and current focus on meeting challenges arising from Bayesian inference of structural stiffness serve to strengthen the capability of vibration-based structural system identification but our methods also have much broader applicability for inverse problems in science and technology where system matrices are to be inferred from noisy partial information about their eigenq

关键词： Probability density function

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Pseudodynamic tests with substructuring of a full-scale precast box-modularized structure made of reinforced concrete shear walls

Pseudodynamic tests with substructuring of a full-scale prec...

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作者： Xu, Guoshan Wang, Zhen Wu, Bin Bursi, Oreste S. Tan, Xiaojing Yang, Qingbo Wen, Long Jiang, Hongbin Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China Department of Civil Environment & Mechanical Engineering University of Trento-Italy Trento Italy Yunnan Institute of Building Research Kunming China Jiangsu Power Design Institute Co. Ltd. of China Energy Engineering Group Nanjing China

A novel horizontal and vertical wall-to-wall and wall-to-floor connection methods for precast box-modularized structure with reinforced concrete shear walls (PBSRCSWs) are proposed in this paper. The entailing behavior of the proposed connections and the seismic performance of one full-scale six-story PBSRCSWs were experimentally studied by means of pseudodynamic substructure tests. In order to improve the relevant experimental accuracy, we presented and validated one versatile testing platform Hytest, combined with external displacement feedback control (EDFC;Hytest with EDFC). In greater detail, it was shown from the pseudodynamic substructure test results that the proposed Hytest with EDFC can effectively impose the desired displacements on the specimens rather than on the actuators. Moreover, both the horizontal and vertical wall-to-wall connections proposed for the PBSRCSWs exhibited a favorable behavior whilst the PBSRCSWs subjected to earthquake records showed an excellent seismic performance. Copyright © 2017 John Wiley & Sons, Ltd.

关键词： Feedback control

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Smartphones equipped with android application software for structural health monitoring

Smartphones equipped with android application software for s...

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2016 International Conference on Smart Infrastructure and Construction, ICSIC 2016

作者： Fang, K. Tian, J.D. Zhang, D.Y. Li, H. Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Harbin China Harbin Institute of Technology School of Civil Engineering Harbin China

ISBN: (纸本)9780727761279

Sensors with high accuracy, low cost, and easy integration into data acquisition system is one of the most important parts in structural health monitoring (SHM) system. In this paper, triaxial accelerometer and gyroscope embedded into the smartphones are utilized to monitor the vibration response of structure. However, in such an acquisition system, structural response data from different smartphones, compared to traditional wired accelerometers, is not always collected at the same time. So, nonsynchronous data processing technology is demonstrated comprehensively herein. First, the application based on Android operating system is described in detail. Modal identification method based on acceleration data which is collected asynchronously by different smartphones is introduced. Thus high performance SHM platform based on smartphones can be built. Then, numerical simulation study shows that modal identification method based on nonsynchronous data is feasible. At last, effectiveness and feasibility of SHM system based on the smartphones is proved in shaking table test on a three-story sheer frame building model. © The authors and ICE Publishing: All rights reserved, 2016.

关键词： Smartphones

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Analysis of load characteristics and responses of low-rise building under tornado

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Procedia Engineering 2017年 210卷 165-172页

作者： Feng Xu Jie Ma Wen-li Chen Yi-qing Xiao Zhong-dong Duan School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Graduate School Shenzhen 518055 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education Harbin 150090 China

In this paper, the numerical model of the tornado generator is established by using the computational fluid dynamics (CFD) method. The radar observed wind profiles of Spencer tornado (1998) are used as inlet boundary condition to form tornado wind field, and the influence of surface roughness is taken into account. This method is used to generate the tornado wind field with the same intensity as recorded in our country, and the wind load characteristics of low-rise building located in different positions in the tornado wind field are analyzed. Then the finite element model of the building is established by ANSYS software, and the building is considered as steel frame-steel plate composite wall structure, which rationality of the finite element model is determined by the modal analysis. The one-way fluid structure interaction method is adopted to transfer the tornado load to the surface of the finite element model, and the displacement response, deformation and damage state of the wall surface and roof surface of the building in different locations of the tornado wind field are analyzed in detail.

关键词： Tornado CFD Low-rise building Finite elemen model Fluid structure interaction

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Modular construction mechanics of a European pressurized reactor steel containment liner

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2017年第6期18卷 467-486页

作者： Jia-chuan YAN Xiao-fei JIN Feng QIN Zheng LI Feng FAN Jin-ping OU Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China China Construction First Engineering Division Corporation Limited Beijing 101300 China Country Garden Foshan 528312 China China Construction Second Engineering Bureau Nuclear Power Plants Branch Shenzhen 518034 China

A European pressurized reactor （EPR） steel containment liner structure is comprised of the cylinder part and the dome part. An introduction of the steel liner structure is presented, followed by studies on the key mechanical features of the construction process using a refined finite element method. The steel liner was divided into several modules and then assembled during construction. Firstly, the equipment structure used to hoist the liner module was optimized, the lifting lug was analyzed using a multi-scale finite element model; the wind speed limit during lifting was also studied. Subsequently, the effect of internal forces during assembly between the liner modules, the lateral pressure of fresh concrete, the non-uniform temperature load, and the wind load on the cylinder module was analyzed. According to the time-varying structural performance during continuous concrete pouring and the hardening construction, an ＂overlapping element and birth-death element＂ technique was adopted to analyze the deformation and stress of the long-span steel dome liner. In addition, the stability-bearing capacities of the dome structure during construction were also studied, which took into consideration the effect of the initial geometrical imperfections and the elasto-plasticity of the material. This study presents a reference in terms of the mechanics of the construction scheme and the safety of such a type of structure.

关键词： Containment Construction mechanics Steel liner Overlapping element Birth-death element

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A new multi-coefficients shrinkage model for concrete

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Jianzhu Cailiao Xuebao/Journal of Building Materials 2016年第5期19卷 826-831页

作者： Tang, Can Zheng, Wenzhong Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China

The contracting experiments were conducted on 69 concrete prisms, which include 5 different strength grades, 2 curing conditions, and 2 humidity environments, and experimental data of concrete shrinkage for 589d were accumulated. The influence coefficients of some factors on the shrinkage of concrete were obtained by normalization and fitting 588 experimental data collected from references. A new multi-coefficients shrinkage model for concrete was proposed based on the formula of influence coefficients and experimental data, which was suitable for the humidity from 10% to 100%, temperature from 5℃ to 80℃, theoretical thickness from 10mm to 500mm, curing time from 1d to 500d, cement content from 190kg/m3 to 500kg/m3, and water-cement ratio(by mass) from 0.35 to 0.70. The calculation results from proposed shrinkage model is agreed well with the experimental data. © 2016, Editorial Department of Journal of Building Materials. All right reserved.

关键词： Concretes

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Creep behavior of reinforced concrete column in consideration of sectional stress redistribution

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Jianzhu Jiegou Xuebao/Journal of Building structures 2016年第5期37卷 264-272页

作者： Zheng, Wenzhong Tang, Can Liu, Yuchen Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China

In order to investigate the effect of sectional stress redistribution on creep behavior of axial compressive concrete column, creep experiments were conducted on 12 groups of 100 mm×100 mm×400 mm concrete specimens under variable compressive stress. The effect of key parameters on the creep of reinforced concrete column and the sectional stress redistribution was investigated using the program edited by the MATlab software. The results show that the spring-back strain coefficient is 0.89 when the initial stress level is not larger than 0.35, and the initial stress level decreases with the increase of the initial stress level after the initial stress level is higher than 0.35. The ultimate creep value of axial compression reinforced concrete column decreases with the prolongation of the load age, the increase of longitudinal compression steel reinforcement ratio, section size and relative humidity, the decrease of concrete strength, initial stress level and temperature. The relations between the stable ultimate creep value of axial compression reinforced C20~C50 concrete column and each key parameters were fitted based on the simulation results. © 2016, Editorial Office of Journal of Building structures. All right reserved.

关键词： Axial compression

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Compressive sensing-based wireless sensors and sensor networks for structural health monitoring

Compressive sensing-based wireless sensors and sensor networ...

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2016 International Conference on Smart Infrastructure and Construction, ICSIC 2016

作者： Bao, Y. Li, H. Key Lab of Structures Dynamic Behavior and Control of Ministry of Education Harbin Institute of Technology Harbin China Harbin Institute of Technology School of Civil Engineering Harbin China

ISBN: (纸本)9780727761279

Wireless sensor technology-based structural health monitoring (SHM) has been widely investigated recently. This paper presents the new developments and applications of compressive sensing (CS) for wireless sensors and sensor networks-based SHM in our research group. Frist, the group sprse optimization based compressive sensing for data sampling and recovery of wireless sensor network is introduced. Then, the lost data recovery for wireless sensors are presented. CS provides a data loss recovery technique, which can be embedded into smart wireless sensors and effectively increases wireless communication reliability without re-Transmitting the data;the promise of this approach is to reduce communication and thus power savings. To embed into the smart sensor, a method called random demodulator is employed to provide memory and power efficient construction of the random sampling matrix. The program is embedded into the Imote2 smart sensor platform and tested in a series of sensing and communication experiments and field tests. Lastly, the fast moving wireless sensoing technique is presened. For the fast moving wireless data transmission, the Doppler effects are the main reason causing data packet loss. A field test on a cable-stayed bridge is performed to valid the ability of the CS-based robust wireless data transmission approach in obtaining high-quality data for the fast-moving wireless sensing technique. © The authors and ICE Publishing: All rights reserved, 2016.

关键词： Compressed sensing

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Analysis of post-tensioned precast segmental bridge piers reinforced with steel and FRP bars 8

Analysis of post-tensioned precast segmental bridge piers re...

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8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016

作者： Wang, Zhenyu Cai, Zhongkui Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9789881448026

The rapid construction nature and outstanding self-centring ability make the post-tensioned precast segmental (PTPS) bridge pier a promising alternative to traditional cast-in-place piers. In this paper, PTPS piers reinforced with both steel and fibre reinforced polymer (FRP) bars were numerically analyzed. This type of pier is referred to as a hybrid bars reinforced PTPS bridge pier in this paper. The steel bars which continuously cross the segment joints (referred to as ED bars) were expected to improve the energy dissipation ability of the PTPS piers, while the FRP bars were expected to increase the post-yield stiffness and to decrease the residual displacement. Monotonic and cyclic analyses on hybrid bars reinforced PTPS piers were subsequently conducted. Three parameters were investigated, namely, the mechanical properties of FRP bars, the FRP bar reinforcement ratio and the proportion of FRP bars to ED bars. According to the analysis results in this study, the FRP bars are effective on improving the self-centring ability of the hybrid bars reinforced PTPS piers. Copyright © 2016 Department of Civil and Environmental Engineering & Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University.

关键词： Energy dissipation

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