分段布索预应力柱面巨型网壳结构基本抗震性能研究  

Research on the basic seismic performance of segmentally prestressed cylindrical reticulated mega-structures

作　　者：王继新 李佳豪[1] 贺冉 WANG Jixin;LI Jiahao;HE Ran(School of Civil Engineering,Hunan City University,Yiyang,Hunan 413000,China;School of Civil Engineering,Hunan University,Changsha,Hunan 410082,China)

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南城市学院学报（自然科学版）》2024年第5期12-21,共10页Journal of Hunan City University:Natural Science

基　　金：湖南省大学生创新创业训练计划项目(S202411527008);湖南省企业科技特派员计划项目(2021GK5075)。

摘　　要：以分段布索预应力柱面巨型网壳结构为研究对象,首先,通过模态分析对其动力特性和预应力体系的引入对柱面巨型网壳结构各方向刚度的影响规律进行了分析;然后,通过时程分析对其在三维地震作用下的地震响应进行了研究;最后,对该结构时程分析中所需考虑的地震作用维数、反应谱法的适用性及合理的振型组合数进行了探究。结果表明,预应力体系的引入使结构横向和竖向刚度得到明显增强,而对纵向刚度影响较小,且结构频谱十分密集,各方向振型耦合作用明显;三维地震作用下,位移动力放大系数约为1.32,大部分杆件内力动力放大系数约为1.2,主节点区个别杆件动内力放大系数可能较大,设计中仅按静力分析结果进行截面设计可能会偏于不安全;可采用二维XY向地震输入或振型挑选反应谱法对此类结构的位移及关键杆件内力的地震响应进行简化分析,且参与组合的振型阶数需在46阶以上。Taking the segmentally prestressed cylindrical reticulated mega-structure as the research object,firstly,the influence of its dynamic characteristics and the introduction of prestressed system on the stiffness of the cylindrical reticulated shell structure in all directions are analyzed by modal analysis.Then,the seismic responses under the three-dimensional seismic actions are studied through time history analysis.Finally,the seismic action dimension,the applicability of the response spectrum method and the reasonable number of mode combinations needed to be considered in the time history analysis of the structure are explored.The results show that the introduction of the prestressed system significantly enhances the lateral and vertical stiffness of the structure,but has little effect on the longitudinal stiffness.The frequency spectrum of the structure is very dense,and the coupling effect of the vibration modes in all directions is obvious.Under the action of three-dimensional ground motion,the dynamic amplification factor of displacement is about 1.32,and the dynamic amplification factor of internal force of most members is about 1.2.The dynamic internal force amplification factor of individual members in the main node area may be large,and the cross-section design based on static analysis results may be unsafe.The two-dimensional XY ground motion input or mode selection response spectrum method can be used to simplify the seismic response of the displacement of such structures and the internal force of key members.The order of vibration mode participating in the combination should be above 46 orders.

关 键 词：分段布索预应力柱面巨型网壳结构 动力特性 地震响应 时程分析 反应谱分析 简化分析方法 

分 类 号：TU391[建筑科学—结构工程]