全装配式RC楼盖建筑结构振动台试验研究  

Shaking table test of structure with discretely connected precast RC diaphragm

作　　者：庞瑞[1] 孙园园 徐铸 高超凡 杨金平 张盼盼 PANG Rui;SUN Yuanyuan;XU Zhu;GAO Chaofan;YANG Jinping;ZHANG Panpan(Henan Key Laboratory of Grain and Oil Storage Facility&Safety,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]河南工业大学河南省粮油仓储建筑与安全重点实验室,河南郑州450001

出　　处：《建筑结构学报》2023年第5期125-136,共12页Journal of Building Structures

基　　金：国家自然科学基金项目(51778214,52278172);中原青年拔尖人才项目(ZYQR201912170);河南省粮油仓储建筑与安全重点实验室开放课题(2021KF-02)。

摘　　要：为研究分布式连接全装配RC楼盖(DCPCD)建筑结构动力特性与地震响应,设计制作了采用DCPCD的4层2开间单跨框架-剪力墙结构1/4缩尺模型,并通过不同水准地震作用下的振动台试验,研究了结构的破坏形态、加速度与位移响应、楼盖平面内变形规律与楼盖平面内刚性特征等。结果表明:在加载过程中,全装配式RC楼盖表现出良好的工作性能,能较好地协同各榀抗侧力结构共同受力;结构整体呈现出典型的框架-剪力墙结构的出铰顺序和破坏形态;结构的自振频率随地震水准峰值加速度的增大而减小,阻尼比随地震水准峰值加速度的增大而增大;在弹性阶段结构一阶振型以整体侧移为主,伴随着一定的楼盖平面内变形;随着地震水准峰值加速度的增大,在加载后期楼盖的平面内变形愈加明显,且结构出现了一定的扭转反应,结构累积损伤已较为严重,各抗侧力构件水平振动同步性逐步降低;模型结构中的DCPCD存在不满足国内外标准中刚性楼盖界定的现象,建议应用中考虑楼盖的平面内变形对结构动力特性与地震响应的影响。An experimental program consisting 1/4 scale model shaking table test of a 4-story 2-room single-span frame-shear wall structure adopting discretely connected precast RC diaphragm(DCPCD)was conducted to evaluate the dynamic characteristics and seismic responses of DCPCD building structures.Performance of the specimen was evaluated in terms of the structure's failure mode,acceleration and displacement responses,in-plane deformation of the floor and in-plane rigidity through shaking table test under different seismic conditions.The test results show that the DCPCD shows good working performance,and can work well in coordination with the lateral force resisting structures.The structure presents the hinge-out sequence and failure mode of a typical frame-shear wall structure.The natural frequency of the structure decreases with the increase of the seismic level peak ground acceleration(PGA),and the damping ratio increases with the increase of the seismic level PGA.In the elastic stage,the first-order mode of the structure is dominated by the overall lateral deformation,accompanied by a certain in-plane deformation of the DCPCD.As the seismic level PGA increases,the in-plane deformation of DCPCD becomes more obvious in the later stage of loading,the structure shows some torsional response;and the cumulative damage of the structure has become more serious in this stage,while the horizontal vibration synchronization of the lateral force resisting structures is gradually reduced;DCPCD in the test model does not meet the definition of rigid floor in domestic and foreign standards,and it is recommended to consider the influence of the in-plane deformation of the diaphragm on the dynamic characteristics and seismic responses of the structure in engineering applications.

关 键 词：全装配式RC楼盖建筑结构 振动台试验 动力特性 地震响应 楼盖平面内变形 抗震设计 

分 类 号：TU375.2[建筑科学—结构工程] TU317.1