框架-嵌入式墙体结构抗震性能试验研究与有限元分析

Experimental and analytical study on seismic performance of frame-embedded walls

对框架-嵌入式墙体结构进行了拟静力试验和有限元分析,研究了其承载力和耗能能力,探讨了墙板与柱间摩擦系数、轴压比以及墙板分割块数对结构抗震性能的影响。研究结果表明:框架-嵌入式墙体结构滞回曲线形状较为饱满,表现出良好的延性和耗能能力,且嵌入墙体后明显提高了框架结构的抗侧刚度和承载力;在结构屈服前(正常使用状态),墙板间无明显通缝,屈服后,墙板错动现象明显,墙板与墙板、墙板与底梁间均出现明显的通缝,增加墙板与柱间的摩擦系数,可减小通缝宽度;在一定范围内,增大柱轴压比,可提高框架-嵌入式墙体结构的承载力;由于嵌入墙板与柱轴线不在一直线上,框架柱承受了一定的扭矩,在实际工程设计中,应增加柱的抗扭构造配筋或进行柱抗扭配筋设计。

The bearing capacity and energy dissipation of the frame-embedded walls were studied through quasi-static test and finite element analysis. The influences of friction coefficient between the wallboard and column, axial compression ratio and number of the wallboards on seismic performance of the structure were also explored. The experimental and analytical results show that the hysteretic curves of the frame-embedded wails are full. The structure performs well in ductility and energy dissipation, and the embedded walls can improve the lateral stiffness and ultimate bearing capacity of frame structure obviously. There is no significant crack between the wallboards before the structure yields, while the appearances of dislocation and crack between the wallboards, crack between the wallboards and bottom beam are obvious after the structure yields. The crack width can be reduced through increasing the friction coefficient between the wallboard and column. With the increase of axial compression ratio, the bearing capacity of the structure is improved. Each column bears large torque because of the eccentricity between embedded wall and axis of column, so it is necessary to improve or calculate the structural reinforcement to enhance the torsion resistance ability in practical engineering design.