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Earthquakes and Structures Volume 25, Number 2, August 2023 , pages 113-123 DOI: https://doi.org/10.12989/eas.2023.25.2.113 |
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Study on energy dissipation mechanism of cross-shaped BRB with built-up angle steel |
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Yanmin Yang, Ying Xiong, Peng Wang, Xiangkun Meng and Tianyuan Cai
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| Abstract | ||
| A novel type of buckling restrained brace with built-up angle steel was developed. The core segment was formed by welding angle steel, and the middle section was reduced by cutting technology to solve the problem that the end of BRB was easy to buckle. The experimental program has been undertaken to study the performance of BRBs with different unbonded materials (silica gel, kraft paper) and different filler materials (ordinary concrete, full light-weight concrete). Four specimens were designed and fabricated for low cycle reciprocating load tests to simulate horizontal seismic action. The failure mode, hysteretic curves, tension-compression unbalance coefficient and other mechanical parameters were compared and analyzed. The finite element software ABAQUS was used to conduct numerical simulation, and the simulation results were compared with the experimental phenomena. The test results indicated that the hysteretic curve of each specimen was plump. Sustaining cumulative strains of each specimen was greater than the minimum value of 200 required by the code, which indicated the ductility of BRB was relatively good. The energy dissipation coefficient of the specimen with silica gel as unbonded material was about 13% higher than that with kraft paper. The experimental results were in good agreement with the simulation results. | ||
| Key Words | ||
| cross-shaped buckling restrained brace; energy dissipation capacity; finite element method; full light-weight concrete; hysteretic behavior | ||
| Address | ||
| Yanmin Yang, Peng Wang, Xiangkun Meng and Tianyuan Cai: School of Civil Engineering, Jilin Jianzhu University, Changchun 130118, China Ying Xiong: School of Architecture and Engineering, Qingdao Institute of Technology, Qingdao 266300, China | ||