阻尼器
消散
产量(工程)
结构工程
有限元法
刚度
振动
工程类
材料科学
复合材料
量子力学
热力学
物理
作者
Shan Wu,Haoxiang He,Shitao Cheng,Yifei Chen,Zheng Wang
摘要
The traditional metal yield dampers such as buckling-restrained brace are designed only for strong earthquakes. Under small earthquake, it is difficult to dissipate the energy for common single-stage yield damper. In addition, it is difficult to observe its damage state after earthquake and inconvenient to replace the energy dissipation components separately. Therefore, a new metal sleeve damper which can dissipate the energy under all levels of earthquakes is proposed in this study. Due to the different yield displacements of the energy dissipation strips with different aspect ratios, the damper has multi-stage yield characteristics. Considering the stiffness degradation effect from the semi-rigid joints on both sides of the strips, the mechanical performance parameters of the damper are derived. The quasi-static experiment of the damper is carried out. Finite element method (FEM) is utilized to simulate the performance of the damper. At last, the damping effects of the multi-stage yield damper and common single-stage yield damper are compared. The results indicate that the accuracies of the mechanical performance parameters computation formulas are high. The energy dissipation performance of the multi-stage yield damper is excellent. The correctness of the finite element (FE) modeling method is verified. The seismic performance of the RC frame with the multi-stage yield damper is improved significantly under all levels of earthquakes. Comparing with the single-stage yield damper, the multi-stage yield damper is more effective in the vibration control of the reinforced concrete (RC) frame.
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