地铁上盖斜柱转换大跨度RC框架结构抗震能力分析  

Seismic capacity analysis of large span RC frame structure converted with inclined columns on the metro superstructure

作　　者：马艳 马肖彤 杨军 陆华 拓明阳 张瑞豪 Ma Yan;Ma Xiaotong;Yang Jun;Lu Hua;Ta Mingyang;Zhang Ruihao(School of Civil Engineering,North Minzu University,Yinchuan 750021,China;School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]北方民族大学土木工程学院,宁夏银川750021 [2]西安理工大学土木建筑工程学院,陕西西安710048

出　　处：《建筑科学》2024年第5期186-194,共9页Building Science

基　　金：宁夏自然科学基金(2021AAC03317);国家自然科学基金(52368011)。

摘　　要：为研究地铁上盖斜柱转换大跨度RC框架结构的抗震能力,对某地铁上盖建筑进行原位动力测试,分析得到结构的自振频率、振型及阻尼。并应用有限元软件SAP2000建立该结构的空间模型,进行动力特性及静力弹塑性分析及弹性时程分析,结果表明:设置斜柱使底部形成三角形框格区,减缓了结构塑性铰的发展,同时满足“强柱弱梁”的设计要求,显著提高了RC框架结构的整体性与稳定性。地震作用下斜柱RC框架结构的底部支撑力及弯剪复合受力性能加强,致使框架结构的地震破坏模式较普通框架发生改变,顶层成为薄弱层,分析结果为RC斜柱转换结构的设计提供了参考。To study the seismic resistance of the long-span RC frame structure with oblique column on the subway superstructure,the in-situ dynamic test of a subway superstructure is carried out,and the natural frequency,vibration mode and damping of the structure are analyzed.Then the finite element software SAP2000 is used to establish the spatial model of the structure,and the dynamic characteristics,static elastic-plastic analysis and elastic time-history analysis are carried out.The results show that the inclined columns make the bottom form a triangular frame area,which shows down the development of the plastic hinge of the structure.At the same time,it meets the design requirements of"strong column and weak beam",which significantly improves the integrity and stability of the RC frame structure.Under the earthquake,the bottom support force and bending and shear composite force performance of the oblique column RC frame structure is strengthened,resulting in the seismic failure mode of the frame structure being changed compared with the ordinary frame,and the top layer becomes a weak layer.The analysis results provide a reference for the design of the RC inclined column conversion structure.

关 键 词：斜柱转换RC框架 抗震性能 弹塑性分析 弹性时程分析 

分 类 号：TU375[建筑科学—结构工程]