平面内剪切型软钢阻尼墙偏心受力减震性能研究

提出一种平面内剪切型软钢阻尼墙，通过对其进行基本力学性能试验和疲劳性能试验，分析该软钢阻尼墙的减震性能。考虑到实际工程应用中阻尼墙会发生平面外变形，设计具有平面外初始偏心的阻尼墙试件，研究其在偏心受力时的减震性能变化规律。结果表明，该软钢阻尼墙在平面外偏心情况下仍表现出良好的滞回性能和疲劳性能，但受偏心影响，阻尼墙试件的初始刚度、等效刚度、耗能量及耗能比等较平面内试件均有不同程度的下降；对比阻尼墙的基本力学性能，其疲劳性能受偏心荷载的影响更大，偏心受力试件较平面内试件的屈服荷载和耗能量的降幅均超过6%。数值模拟分析表明，采用Bouc-Wen模型可以较好地模拟该软钢阻尼墙的试验滞回曲线，该模型在减震结构设计中可用作此软钢阻尼墙的力学分析模型。

Performance of novel mild steel damping wall under eccentric load

This paper presented a novel shear-type mild steel damping wall. A basic performance test and fatigue test of the new damping wall was conducted to investigate the performance of the new shear-type metal damper. Considering out-of-plane deformation of the damping wall, a specimen with initial eccentric deformation was tested and the influence of the out-of-plane deformation upon the performance of the damping wall was studied. Test results show that the novel shear-type mild steel damping wall of eccentricity still show good hysteretic and fatigue properties while damper stiffness, energy dissipation capacity, etc., are reduced to different extent, especially under fatigue test,the maximum deviation of yield strength and the energy consumption are more than 6%. Moreover, simulation results using Bouc-Wen model are in good agreement with experimental results. Bouc-Wen model can be used as mechanical analysis model of the new shear-type mild steel damping wall in energy dissipated structural design.