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Author Correction: Reduced graphene oxide functionalized nanofibrous silk fibroin matrices for engineering excitable tissues

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NPG Asia Materials 2019年第1期11卷 1页

作者： Guoxu Zhao Huaibin Qing Guoyou Huang Guy M. Genin Tian Jian Lu Zhengtang Luo Feng Xu Xiaohui Zhang The Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and Technology Xi’an Jiaotong University Xi’an China Bioinspired Engineering and Biomechanics Center (BEBC) Xi’an Jiaotong University Xi’an China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi’an China NSF Science and Technology Center for Engineering Mechanobiology Washington University in St. Louis St. Louis USA MOE Key Laboratory for Multifunctional Materials and Structures Xi’an Jiaotong University Xi’an China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing China Department of Chemical and Biomolecular Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong

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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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Damage Detection for SMC Benchmark Problem: A Subspace-Based Approach

Damage Detection for SMC Benchmark Problem: A Subspace-Based...

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作者： Zhou, Wensong Li, Shunlong Li, Hui Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China School of Transportation Science and Engineering Harbin Institute of Technology Harbin150090 China Key Laboratory of Advanced Material and Intelligent Control Technology on Transportation Safety Harbin Institute of Technology Harbin150090 China

A full-scale bridge benchmark problem was issued by the Center of Structural Monitoring and control at the Harbin Institute of Technology. The data used in this problem were collected by an in situ structural health monitoring system implemented into a full-scale cable-stayed bridge before and after the bridge was damaged, which is very rare in structural health monitoring field. This benchmark problem will help to verify and/or make comparison of the condition assessment and the damage detection methods, which are usually validated by numerical simulation and/or laboratory testing of small-scale structures with assumed deterioration models and artificial damage. With respect to damage detection of girder, one of the benchmark problems, using the monitored and field testing acceleration data, this paper describes a damage detection method, based on a residual generated from a subspace-based covariance-driven identification method, to detect the damage, and give relative quantitative damage indexes. This method was applied on both two parts of the given benchmark problem, and then detailed discussions and results on this problem are reported in this paper. © 2016 World Scientific Publishing Company.

关键词： Damage detection

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Influence of mineral admixtures on the rheological behavior of self-compacting concrete

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) 2016年第2期46卷 439-444页

作者： Gao, Xiao-Jian Sun, Bo-Chao Ye, Huan Wang, Zi-Long Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

In this paper, the influence of mineral admixtures on the rheological properties of fresh Self-Compacting Concrete (SCC) mixture was studied using a new type of concrete rheometer. The results show that both yield shear stress and plastic viscosity of the SCC mixture decrease as the content of fly ash in the mixture increases. As the content of Ground Granulated Blast Furnace Slag (GGBFS) increases, the thixotropy behavior of the SCC mixture becomes more obvious, and the yield stress decreases first and then increases. Both the yield stress and the thixotropy behavior of SCC mixture increase with the addition of limestone powder. For all the SCC mixtures with different mineral admixtures, as the storage time increases, the thixotropy behavior of fresh concrete is gradually weakened, the yield stress increases and the plastic viscosity decreases. © 2016, Editorial Board of Jilin University. All right reserved.

关键词： Fly ash

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Realization of the global yield mechanism of RC frame structures by redesigning the columns using column tree method

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Science China(Technological Sciences) 2015年第10期58卷 1627-1637页

作者： BAI JiuLin OU JinPing School of Civil Engineering Harbin Institute of Technology Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education

Global failure mechanism, i.e., the strong-column weak-beam mechanism, can provide higher total energy dissipation capacity with less ductility demand on components than other failure modes, and results in a more uniform story drift distribution and higher resistance to earthquake loads at the system level. However, the current code-based elastic design method cannot guarantee the global failure mechanism of frame structures under severe earthquakes. In this paper, a simple, but practical design procedure is proposed to ensure the global failure mechanism of reinforced concrete(RC) frame structures by redesigning the columns using the column tree method(CTM). CTM considers the yield limit state of all beams and column bases. The code-based design is firstly carried out to determine the section information of all beams and base columns. Then, the internal force demands applied on the column tree can be derived. Lastly, the column moments, shear forces and axial forces are determined according to the free-body diagram of CTM to finish the column redesign. Two RC frame structures with 6 and 12 stories are illustrated to verify the design procedure. The analytical results demonstrate the proposed approach can realize the global failure mechanism.

关键词： global failure mechanism column tree method （CTM） reinforced concrete frame structures failure mode plastic hinges

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Experimental studies on behavior of fully grouted reinforced-concrete masonry shear walls

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Earthquake Engineering and Engineering Vibration 2015年第4期14卷 743-757页

作者： Zhao Yan Wang Fenglai Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education School of Civil Engineering Harbin Institute of Technology

An experimental study is conducted on fully grouted reinforced masonry shear walls (RMSWs) made from concrete blocks with a new configuration. Ten RMSWs are tested under reversed cyclic lateral load to investigate the influence of different reinforcements and applied axial stress values on their seismic behavior. The results show that flexural strength increases with the applied axial stress, and shear strength dominated by diagonal cracking increases with both the amount of horizontal reinforcement and applied axial stress. Yield displacement, ductility, and energy dissipation capability can be improved substantially by increasing the amount of horizontal reinforcement. The critical parameters for the walls are derived from the experiment: displacement ductility values corresponding to 15% strength degradation of the walls reach up to 2.6 and 4.5 in the shear and flexure failure modes, respectively; stiffness values of flexure- and shear-dominated walls rapidly degrade to 17%–19% and 48%–57% of initial stiffness at 0.50 D_max (displacement at peak load). The experiment suggests that RMSWs could be assigned a higher damping ratio (～14%) for collapse prevention design and a lower damping value (～7%) for a fully operational limit state or serviceability limit state.

关键词： reinforced-concrete masonry shear wall shear strength ductility stiffness degradation energy dissipation equivalent viscous damping ratio

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Corrigendum to “Predicting water permeability and relative gas permeability of unsaturated cement-based material from hydraulic diffusivity” [Cem. Concr. Res. 58 (2014) 152–1 60]

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Cement and Concrete Research 2016年 87卷 105-106页

作者： Chunsheng Zhou Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education Heilongjiang Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

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Damage detection in metallic plates using d36 piezoelectric phased arrays 8

Damage detection in metallic plates using d36 piezoelectric ...

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8th European Workshop on Structural Health Monitoring, EWSHM 2016

作者： Wang, Wentao Lynch, Jerome P. Li, Hui Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China Department of Civil and Environmental Engineering University of Michigan Ann ArborMI48109-2125 United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109-2125 United States

ISBN: (纸本)9781510827936

Recently, d36-type piezoelectric wafers derived from lead magnesium niobate-lead titanate (PMN-PT) single crystal materials have been proposed for elastic wave generation in thinwalled structures. In contrast to traditional d31 piezoelectric materials which generate symmetric and anti-symmetric Lamb waves, d36 introduces these same Lamb waves plus an inplane shear horizontal (SH) wave. Based on guided wave theory, the SH0 wave mode is nondispersive which may find many advantages uses in structural health monitoring. To detect and localize damage (e.g., cracks, corrosion) in thin walled structures, a phased array of d36- type piezoelectric wafers is proposed. To validate the proposed phase array, extensive experiments have been conducted using an aluminum plate with four d36 PMN-PT piezoelectric wafers surface bonded. The d36 phased array is shown capable of accurately detecting the location of local damage in the plate. Good detection accuracy is observed indicating that this proposed methodology has the potential to provide an effective identification of damage in metallic thin walled structures.

关键词： Damage detection

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Time-dependent reliability prediction analysis of bridge members considering dependence of failure modes and proof modes

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key Engineering Materials 2015年 648卷 25-34页

作者： Liu, Yuefei Lu, Dagang Key Laboratory of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China

Structural health monitoring systems used in bridges contain sensors providing a large amount of monitored data, such as stress, deflection and ***. In this paper, firstly, based on monitored everyday extreme stress data, time-variant proof load effects of structural members were defined, and based on the time-dependent proof load effects, the time-dependent performance functions of structural member's proof modes were built;and then based on the monitored data, the Bayesian dynamic models(BDMs) of extreme stresses were built, and based on the predicted extreme stress with BDMs, the time-variant performance functions of structural member's failure modes were given;and then based on the time-dependent performance functions of failure modes and proof modes and correlation coefficients between them, with the conditional probability method, the time-dependent reliability indices of structural members were updated and predicted;finally an actual engineering was provided to illustrate the application of the proposed models and methods. © 2015 Trans Tech Publications, Switzerland.

关键词： dynamic models

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