地震作用下钢筋混凝土框架-填充墙相互作用分析

Analysis of interaction between reinforced concrete frame and infilled wall subject to earthquake-induced ground motion

对带填充墙的钢筋混凝土框架结构进行数值分析,研究填充墙体对框架结构抗震性能的影响。采用有限元软件ABAQUS建立了填充墙框架结构模型,通过数值模拟分别分析了墙体开洞、墙体材料以及填充墙与框架的连接形式在多遇和罕遇地震下对填充墙框架动力响应及损伤的影响。分析结果表明:刚性连接下的填充墙对框架产生了刚度效应,使得其自振周期为纯框架的0.2~0.7倍,导致在地震作用下的响应增大,但填充墙对框架的约束效应限制了框架柱的变形,增大了结构的抗侧承载力;罕遇地震下填充墙与框架存在复杂的相互作用,开洞填充墙对框架柱产生了约束作用,减小了柱的计算高度,满布填充墙对框架产生斜压杆效应,导致柱端出现附加剪应力容易出现剪切破坏。柔性连接下的填充墙对框架的自振周期影响很小,在进行抗震验算时可不进行自振周期折减,在多遇和罕遇地震波作用下的动力响应以及损伤均与纯框架类似,与抗震规范的设计计算吻合,同时也可避免填充墙的破坏。

The influence of infilled walls on seismic performance of frame structures is studied by numerical analy- sis of the reinforced concrete frame structure with the infilled walls. Reinforced concrete frame with infilled wallsestablished by the finite element software ABAQUS, is analyzed the influence of dynamic response and structure damage through changing the wall opening, wall materials and the connection form under the frequent and rare earthquake. The results show that the rigid connection of infilled wall has a stiffness effect on the frame, which re- sults in the decrease of the natural vibration period and the increase of the dynamic response. However, the restrai- ning effect of infilled walls on frame limits the deformation of column and increases the lateral bearing capacity of the structure. There is a complex interaction between the infilled wall and the frame under rare earthquake. Infilled walls with open hole have obvious effect of restraint on the frame column and reduce the effective height of column. Full filling wall have an effect of oblique compressive rod to column and causes the additional shear stress to the end of the column which makes shear failure. The effect of vibration period of infilled walls on frame under flexible connection is small. And the dynamic response earthquake. It is consistent with the design and damage are similar to the pure frame under the frequent and rare and calculation of the seismic code.