四层砖混结构1/3缩尺模型模拟地震试验设计与研究
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摘要
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。
To study the destruction mechanism and seismic resistance of brick masonry structure under the action of earthquake,reduced scale model of four-layer brick masonry structure is established and the similarity relationship is proved.The model seismic shaking table tests are simulated after satisfying the test requirements.Structures' seismic responses under the earthquake are observed.Structural damping ratio,natural frequency,acceleration amplification factor,displacement-time curve are also measured.Test results show that the reduced scale model can accurately reflect structural's damage process in the earthquake and measure the effective data.According to the structure failure process,weak positions from strong to weak are followed as the bottom of the frame and the constructional column of the upper masonry conversion parts,bearing wall,beam-column node joints at the bottom of the frame;under the earthquake,floor joints are severely damaged and the combining ways of each component play a vital role in the stability of the structure.Therefore,the ductility of the composite masonry structure building can be appropriately improved and using the way such as floor slab cast-in-place can effectively increase the seismic performance of the brick masonry structure.
To study the destruction mechanism and seismic resistance of brick masonry structure under the action of earthquake,reduced scale model of four-layer brick masonry structure is established and the similarity relationship is proved.The model seismic shaking table tests are simulated after satisfying the test requirements.Structures' seismic responses under the earthquake are observed.Structural damping ratio,natural frequency,acceleration amplification factor,displacement-time curve are also measured.Test results show that the reduced scale model can accurately reflect structural's damage process in the earthquake and measure the effective data.According to the structure failure process,weak positions from strong to weak are followed as the bottom of the frame and the constructional column of the upper masonry conversion parts,bearing wall,beam-column node joints at the bottom of the frame;under the earthquake,floor joints are severely damaged and the combining ways of each component play a vital role in the stability of the structure.Therefore,the ductility of the composite masonry structure building can be appropriately improved and using the way such as floor slab cast-in-place can effectively increase the seismic performance of the brick masonry structure.
引文
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