基于典型工程实例对剪力墙抗震性能动力时程分析的提高研究

为提升剪力墙抗震性能分析精度,以某高层建筑工程楼体剪力墙为背景,将静力弹塑性分析方法与能量等效准则相结合,确定房屋剪力墙结构沿2个主轴方向的三线性恢复力参数,通过参数构建房屋剪力墙相近层模型。使用三维有限元模型模拟房屋剪力墙工程楼体,并采用相近层模型模拟该楼体三维有限元模型抗震性能的动力时程。结果表明,随着地震水平和楼层的增加,房屋剪力墙层间侧移角包络值和顶点侧移角包络值都在明显增加。设置黏滞流体阻尼器可改善房屋剪力墙受两种地震波的作用,在Ⅸ度罕见地震作用下,房屋剪力墙结构的X向减震效果比Y向好,房屋剪力墙X向和Y向层间位移角的最大减震率分别约为38%与18%。

Dynamic Time-history Analysis of Seismic Performance of Shear Walls Based on a Typical Case

To improve the accuracy of analyses of the seismic performances of shear walls, in this study, we took the shear wall in a high-rise building as the engineering background. We then combined the static elastoplastic analysis method with the energy-equivalent criterion to determine the trilinear restoring force parameters of the shear wall structure along the direction of the two principal axes. Based on the parameters, we established a close layer model of the shear wall. Then, we simulated the shear wall of the building using a three-dimensional finite element model, and simulated the its dynamic time histories. The results show that with increases in the earthquake magnitude and the number of building floors, the enveloping value of the story and vertex drift angles of the shear wall obviously increase. The correct setting of the viscous fluid damper can improve the seismic response of the building shear wall. Under rare magnitude-9.0 earthquakes, the damping effect on the shear wall structure in the X direction is better than that in the Y direction. The maximum damping of the story drift ratio of a shear wall structure in the X direction is about 38%, and that in the Y direction is about 18%.