【摘要】 规范对底层框架-抗震墙砌体房屋在强震中引导的破坏模式不够明确,抗整体倒塌性能不易控制。基于震害现象总结了底框结构的典型破坏模式,分析了影响破坏模式的主要因素,探讨了底框结构的合理破坏模式。通过算例分析考察了抗侧刚度比和屈强比对底框房屋结构的抗震性能及破坏模式的影响规律。结果表明:强震宜引导底框层作为薄弱部位耗能;刚度比和屈强比是影响底框房屋破坏模式的主要因素,刚度比越大,屈强比越小,底框层破坏程度越严重,上部楼层破坏程度越轻;7度区宜控制刚度比在1.25~2.0之间,屈强比在0.6~0.8之间,当刚度比较小时可适当减小屈强比,刚度比较大时可适当增大屈强比。更多还原

【Abstract】 The expected failure modes of masonry structures with frame-shear wall at the bottom are not clear enough in Chinese seismic design code. And the integer collapse resistance capacity is not easy to control. A summary of the typical failure modes was proposed according to earthquake damages,and the influencing factors of failure mode were analyzed. The expected failure modes are discussed. The influence rules of the story lateral stiffness ratio( i. e. the ratio of the lateral stiffness of the second floor to that of the first floor) and the story shear strength ratio( i. e. the ratio of the shear strength of the first floor to that of the second floor) on the failure modes and seismic performance of masonry structures with frame-shear wall at the bottom are studied by analyzing calculation examples. The results show that the first story is suitable to be guided as weak part to dissipate energy under strong earthquakes. The story lateral stiffness ratio and the story shear strength ratio are the main influencing factors on the failure modes. The greater the story lateral stiffness ratio or smaller the story shear strength ratio is,the more seriously damage of the lower frame-shear wall,and the less damage of the upper masonry structure will occur. The story lateral stiffness ratio should be control in the range of 1. 25 to 2. 00 and the story shear strength ratio should be control in the range of 0. 6 to 0. 9 in seismic zone of intensity 7. When the story lateral stiffness ratio is low,thestory shear strength ratio could be decreased. When the story lateral stiffness ratio is high,the story shear strength ratio could be increased.更多还原