摘要
通过土体人工黏弹性边界条件以及地震动等效节点的输入机理,结合体外预应力摇摆框架的新型结构控制抗震结构体系,采用有限元分析软件ABAQUS,建立了两种材料类型的自复位框架的三维模型,利用MATLAB软件编写程序实现了等效节点的输入以及黏弹性边界条件的施加。对两种不同材料的自复位框架进行了模态分析及动力时程分析,分析了各自的地震响应结果,研究结果表明:考虑SSI后,自复位框架结构的前三阶自振频率降低明显;考虑SSI后,具有耗能阻尼的自复位框架可能达不到预期的控制效果、自复位框架结构的层间位移及剪力响应有所增大;在软土上进行自复位框架设计时,应考虑SSI的影响。
Through artificial soil viscoelasticity equivalent node boundary conditions and the ground motion input mechanism,combined with new structure control of aseismic structure,external prestressing rocking frame system,using finite element analysis software ABAQUS,3D self-centering frame model of two material types were built for comparative analysis,using MATLAB software programming to achieve the equivalent node input and exert a viscoelastic boundary condition,the modal analysis and the time-history dynamic analysis are carried out for those frames,and the respective results are analyzed.The results show that the first three natural frequencies of the self-centering frame structure decrease obviously after considering the Soil-Structure Interaction(SSI).The self-centering frame with energy dissipation damping may fail to achieve the expected target,and the story drifts and the shear forces of column are increase after considering SSI.The influence of SSI should be considered when designing self-centering frame on soft soil.
作者
张真
李培振
ZHANG Zhen;LI Peizhen(Department of Disaster Mitigation for Structure,Tongji University,Shanghai 200092,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《结构工程师》
2021年第3期42-49,共8页
Structural Engineers
基金
国家自然科学基金项目(51978524)。
关键词
土-结构相互作用
黏弹性人工边界
自复位框架
动力时程分析
抗震性能
soil-structure interaction
viscoelastic artificial boundary
self-centering frame
dynamic time-history analysis
aseismic performance
作者简介
联系作者:张真(1996-),男,重庆人,在读硕士,主要从事结构抗震研究。E-mail:1164954040@qq.com。
