Tests on the mechanical behavior of steel shear panel dampers under axial loads
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摘要: 该文通过5个拟静力试验检验了普通型剪切钢板阻尼器和形状优化型剪切钢板阻尼器的力学性能，分析了形状优化以及轴力对阻尼器力学性能的影响。试验结果表明：阻尼器设计公式计算值与试验结果吻合较好；阻尼器的腹板形状经过优化后，极限位移角增加33%，耗能区域由四角转移至中部，应力和应变集中现象得到明显改善，有效降低了夹持连接部位钢板的断裂损伤发生概率；与设计值相比，轴力可提高阻尼器的屈服承载力但使刚度有所下降；基于装配式思想设计的全螺栓连接阻尼器易于更换，较传统焊接的连接方式避免了焊接应力的不利影响，大幅度减少了修复时间与成本。Abstract: The mechanical behavior of five steel shear panel dampers with or without optimized shapes were tested cyclically to examine the influence of shape optimization and axial loads. The test results show that the stiffness and strength design equations can predict the behavior with less difference to the test values. The ultimate shear deformation of the optimized dampers is 33% larger than the traditional one without optimization. Unlike the traditional damper where plasticity was concentrated in the four corners, the optimized damper starts to yield from the center of the panel, which significantly improves the plasticity strain and stress concentration, thus reduces the fracture probability. Compared with the design values, axial loads can increase the shear bearing force, but decreases the stiffness. Finally, it is found that the all-bolt assembled damper can be easily replaced, and avoid the adverse effect from welding, thus significantly reduce the repair time and cost.
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