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| Tests and numerical simulation for GD-CSLD |
| SHI Luwei1, PENG Lingyun1, SU Jingyu1, YIN Yiwen1, KANG Yingjie2 |
1.Beijing Key Lab of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124, China;
2.School of Civil Engineering, Tsinghua University, Beijing 100084, China |
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Abstract Metal yield damper usually needs to be replaced after fatigue damage and is not easy to meet the requirement of large stroke. Here, a gear drive-circumferential shear lead damper (GD-CSLD) was proposed. It was shown that based on dynamic recovery recrystallization performance of lead at room temperature, GD-CSLD has excellent characteristics of no fatigue damage and no upper limit of displacement in theory through gear-rack fit. According to the structure of core energy dissipation components, tests and numerical simulation for 3 model specimens with different shear shaft sections were conducted. The optimal shear shaft section scheme was selected to design and process GD-CSLD. The hysteretic performance and fatigue performance of the damper were studied through performance tests. Based on the finite element analysis and test results, the energy dissipation mechanism of the damper was analyzed. The results showed that the hysteretic performance of GD-CSLD is stable, it can realize large stroke loading, and there is basically no fatigue damage effect after repeated loading; its energy dissipation mechanism includes two parts of lead material yield and lateral steel-lead friction, their contributions are basically the same.
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Received: 20 January 2020
Published: 15 October 2021
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