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| Performance tests of rotating-amplification type friction self-centering brace and its restoring force model verification |
| WANG Debin1, ZHANG Xinyue1, FU Xing2, WANG Wenming3, LIU Lu4 |
| 1. School of Civil Engineering, Dalian Jiaotong University, Dalian 116028, China;
2. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China;
3. School of Civil Engineering , Shandong Jianzhu University, Jinan 250101, China；
4. Beijing Municipal Road & Bridge Group Co.，Ltd.，Beijing 100032, China |
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Abstract A friction self-centering brace with displacement amplification function (SC-DAFB) is proposed to address the insufficient energy dissipation capacity of traditional self-centering braces and the self-centering capacity of displacement amplification dampers. SC-DAFB is based on the working mechanism of bridge amplification and has a basic structure and working mechanism that are explained in detail. The formula for calculating the restoring force of the brace at each loading stage is derived, and the low-cycle reciprocating loading test of 6 groups of SC-DAFB under different working conditions is carried out. The key mechanical properties of SC-DAFB, such as load bearing capacity, hysteresis curve, energy dissipation and residual displacement, are obtained and compared. The results show that reducing the initial amplification Angle can effectively improve the bearing capacity and energy dissipation performance of the brace. When the self-centering ratio is 1.3, the yield load and maximum load of the brace at the initial amplification angle of 30° increase by 47.6% and 29.4%, respectively, compared with the brace without displacement amplification. The theoretical calculation and the experimental results show good agreement, verifying the accuracy of the theoretical restoring force model.
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Received: 07 August 2023
Published: 15 May 2024
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