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为研究砖混结构在地震作用下的破坏机理和抗震性能,对四层砖混结构建立缩尺模型,并进行相似关系论证,满足试验要求后对四层砖混结构建筑进行模拟地震振动台试验,观测结构在地震中的反应,并测得结构阻尼比、自振频率、加速度放大系数、位移时程曲线。试验结果表明,缩尺模型能准确还原地震中结构的破坏过程并测得有效数据,结构薄弱部位按破坏程度从强到弱依次为底部框架与上层砌体转换部位的构造柱、承重墙、底部框架梁柱节点部位;砖混结构在地震中,楼层连接处受损严重,各构件的结合方式对结构稳定性起着至关重要的作用。因此可适当改进砖混结构房屋的延性,采用楼板现浇等方式能有效增加砖混结构的抗震性能。
In order to study the failure mechanism and anti-seismic performance of masonry-concrete structures under earthquake action, a scale model was built for the four-story masonry structures and the similarity relationship was demonstrated. After satisfying the requirements of the experiment, four-story masonry concrete structures were simulated to simulate the shaking table test , Observing the response of the structure in the earthquake, and measuring the structure damping ratio, natural frequency, acceleration amplification coefficient, displacement time history curve. The experimental results show that the scale model can accurately restore the failure process of the structure in the earthquake and obtain valid data. The weak parts of the structure are in descending order of strength and weakness, such as structural columns, bearing columns and bottom of the conversion area between the bottom frame and the upper masonry, Frame beam and column nodes; brick-concrete structure in the earthquake, the floor joints at the serious damage, the combination of the various components of the structural stability plays a crucial role. Therefore, the ductility of brick-concrete structure houses may be properly improved. The floor anti-vibration performance of brick-concrete structures can be effectively increased by using floor pouring.