外填充墙对高层住宅剪力墙结构受力性能影响分析

Influence of external infill wall on mechanical behavior of shear wall structure in high-rise residence

采用PKPM软件研究了外填充墙受力方式和材料变化对高层住宅剪力墙结构受力性能的影响规律。分析结果表明:外围加气混凝土砌体填充墙全改为钢筋混凝土剪力墙而形成的全现浇外墙剪力墙结构,可以增加原外围加气混凝土砌体填充墙结构的整体刚度,减小原外围加气混凝土砌体填充墙结构的总侧移;两个主轴方向增加的外剪力墙数量差别较大时,有可能改变原外围加气混凝土砌体填充墙结构第一振型的振动方向;增加的外剪力墙有可能改变原外围加气混凝土砌体填充墙结构的刚度中心,使原外围加气混凝土砌体填充墙结构的刚度中心偏离质量中心,加大原外围加气混凝土砌体填充墙结构的扭转效应;增加的外剪力墙有可能是短肢剪力墙或受力性能不好的一字形短肢剪力墙;全现浇外墙剪力墙结构对原外围加气混凝土砌体填充墙结构的整体受力性能和局部构件受力性能影响均较大。外围加气混凝土砌体填充墙全改为轻骨料混凝土填充墙而形成的剪力墙结构,对原外围加气混凝土砌体填充墙结构的整体受力性能影响较小,仅对局部构件的轴压比影响较大,轻骨料混凝土填充墙是一种较为可行的快速建造方式。

By using software PKPM,the mechanical behaviors of the shear wall structure in high-rise residence affected by the material and form of the external infill walls were analyzed.The analysis results show that:the cast-in-place external wall shear wall structure formed by replacing the external aerated concrete masonry infill wall with reinforced concrete shear wall can increase the overall stiffness and reduce the total lateral displacement of the original external aerated concrete masonry infill wall structure.When the numbers of external shear walls increased in the two main axis directions are quite different,it is possible to change the vibration direction of the first mode shape of the original external aerated concrete masonry infill wall structure.The additional external shear wall can change the stiffness center of the original external aerated concrete masonry infill wall structure,make the stiffness center of the original external aerated concrete masonry infill wall structure deviate from the mass center,and increase the torsion effect of the original external aerated concrete masonry infill wall structure.The added external shear wall may be a short-leg shear wall or a straight-shaped short-leg shear wall with poor mechanical performance.The all-in-situ exterior wall shear wall structure has a greater impact on the overall mechanical performance and the mechanical performance of local components of the original external aerated concrete masonry infill wall structure.The external aerated concrete masonry infill wall is completely replaced by a lightweight aggregate concrete infill wall to form a shear wall structure,which has little effect on the overall mechanical performance of the original external aerated concrete masonry infill wall structure,and only has a greater influence on the axial compression ratio of the partial components.and is a more feasible and rapid construction method.