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Experimental and numerical study on hysteretic performance of SMA spring-friction bearings

Earthquake Engineering and Engineering Vibration 2016年第4期15卷 597-609页

作者： Zhuang Peng Xue Suduo Nie Pan Wang Wenting School of Civil and Transportation Engineering Beijing University of Civil Engineering and Architecture Beijing Higher Institution Engineering Research Center of Structural Engineering and New Materials Beijing University of Civil Engineering and Architecture College of Architecture and Civil Engineering Beijing University of Technology

This paper presents an experimental and numerical study to investigate the hysteretic performance of a new type of isolator consisting of shape memory alloy springs and friction bearing called an SMA spring-friction bearing （SFB）. The SFB is a sliding-type isolator with SMA devices used for the seismic protection of engineering structures. The principle of operation of the isolation bearing is introduced. In order to explore the possibility of applying SMA elements in passive seismic control devices, large diameter superelastic tension/compression NiTi SMA helical springs used in the SFB isolator were developed. Mechanical experiments of the SMA helical spring were carried out to understand its superelastic characteristics. After that, a series of quasi-static tests on a single SFB isolator prototype were conducted to measure its force-displacement relationships for different loading conditions and study the corresponding variation law of its mechanical performance. The experimental results demonstrate that the SFB exhibits full hysteretic curves, excellent energy dissipation capacity, and moderate recentering ability. Finally, a theoretical model capable of emulating the hysteretic behavior of the SMA-based isolator was then established and implemented in MATLAB software. The comparison of the numerical results with the experimental results shows the efficacy of the proposed model for simulating the response of the SFB.

关键词： sliding isolation bearing SMA helical spring hysteretic performance quasi-static test theoretical model

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hysteretic behavior of cambered surface steel tube damper:Theoretical and experimental research

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Frontiers of Structural and Civil Engineering 2023年第4期17卷 606-624页

作者： Jiale LI Yun ZHOU Zhiming HE Genquan ZHONG Chao ZHANG Department of Civil Engineering Guangzhou UniversityGuangzhou 510006China Department of Civil&Transportation Engineering Guangdong University of TechnologyGuangzhou 510006China

A novel cambered surface steel tube damper(CSTD)with a cambered surface steel tube and two concave connecting plates is proposed *** steel tube is the main energy dissipation component and comprises a weakened segment in the middle,a transition segment,and an embedded *** is believed that during an earthquake,the middle weakened segment of the CSTD will be damaged,whereas the reliability of the end connection is *** and experimental studies are conducted to verify the effectiveness of the proposed *** for the initial stiffness and yield force of the CSTD are ***,two CSTD specimens with different steel tube thicknesses are fabricated and tested under cyclic quasi-static *** result shows that the CSTD yields a stable hysteretic response and affords excellent energy dissipation.A parametric study is conducted to investigate the effects of the steel tube height,diameter,and thickness on the seismic performance of the *** with equalstiffness design steel tube dampers,the CSTD exhibits better energy dissipation performance,more stable hysteretic response,and better uniformity in plastic deformation distributions.

关键词： cambered surface steel tube damper energy dissipation capacity finite element model hysteretic performance parametric study

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A new type of damper with friction-variable characteristics

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Earthquake Engineering and Engineering Vibration 2009年第4期8卷 507-520页

作者： Zhou Xiyuan Peng Lingyun Beijing Key Lab of Earthquake Engineering and Structural Retrofit Beijing University of Technology Beijing 100124. China

Professor T. T. Soong is one of the early pioneers in field of earthquake responsc control of structures. A new type of smart damper, which is based on an Energy Dissipating Restraint （EDR）, is presented in this paper. The EDR by Nims and Kelly, which has a triangle hysteretic loop, behaves like an active variable stiffness system （AVS） and possesses the basic characteristics of a linear viscous damper but has difficulty in capturing the output and large stroke simultaneously needed for practical applicataions in engineering structures. In order to overcome this limitation, the friction surface in the original Sumitomo EDR is divided into two parts with low and high friction coefficients in this paper. The results of finite element analysis studies show that the new type of smart friction damper enables large friction force in proportion to relative displacement between two ends of the damper and has a large allowable displacement to fit the demands of engineering applications. However, unlike the EDR by Nims and Kelly, this type of friction variable damper cannot self re-center. However, the lateral stiffness can be used to restore the structure. The nonlinear time history analysis of earthquake response for a structure equipped with the proposed friction variable dampers was carried out using the IDARC computer program. The results indicate that the proposed damper can successfully reduce the earthquake response of a structure.

关键词： friction variable damper energy dissipation restraint hysteretic performance finite element analysis nonlinear time history analysis

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