摘要
大跨度空间预张力钢结构体系的关键问题是预张力的设计。本文研究了一种新型的钢环壳+预张力索网屋盖结构体系在罕遇地震作用下的非线性分析。文中介绍了一种显式准静态分析计算拉索预应力的新思路,该方法可考虑几何非线性和材料非线性(钢材和混凝土非线性),同时考虑下部混凝土结构与上部钢屋盖相互影响的整体结构地震非线性分析。通过与隐式分析对比,证明了本文方法的有效性。同时,该新型结构体系的整体结构罕遇地震动力弹塑性时程分析表明:1、索网未进入屈服,钢环壳基本未屈服,仅个别杆件出现轻微塑性应变,整体钢屋盖基本满足大震不屈服性能目标;2、直接支撑屋盖的型钢混凝土柱个别位置出现了比较严重的损坏,应采取相应措施进行加强;3、钢屋盖和下部混凝土结构位移角未超过1/50,满足"大震不倒"的性能要求。研究结果为实际工程结构设计提供了有意义的参考建议。
The design of pretension is the key problem of a long span space pretension steel structure system.In this paper,the nonlinear analysis of a type of steel roof structure system with reticulated ring shell and pretension cable-net subjected to rare earthquakes was studied.A new explicit quasi-static analysis procedure for calculating the prestress of cable was introduced.The method could consider geometric nonlinearity and material nonlinearity(both steel and concrete nonlinearity),and the seismic nonlinear analysis of the whole structure could consider the interaction between the lower concrete structure and the upper steel roof.By comparing with implicit analysis,the effectiveness of the proposed method was proved.At the same time,The dynamic elastoplastic time-history analysis of the whole structure of this new structure system under rare earthquake shows that:1.The cables did not enter yield.The reticulated ring steel shell was basically unyielding with slight plastic strains in only a few bars.The whole steel roof basically meet the unyielding performance target under rare earthquake.2.A few steel-concrete columns directly supporting the roof were badly damaged,which should be strengthened by corresponding measures.3.The maximum inter-story drifts of the steel roof and the lower concrete structure did not exceed the limit of 1/50,which could meet the performance requirements of"no collapsing under strong earthquake".The results of study provided valuable suggestions for structural design of the project.
作者
潘玉华
常强
马明
赵鹏飞
康钊
朱禹风
刘涛
郭宇飞
PAN Yuhua;CHANG Qiang;MA Ming;ZHAO Pengfei;KANG Zhao;ZHU Yufeng;LIU Tao;GUO Yufei(China Academy of Building Research,Beijing 100013,China;National Engineering Research Center of Building Technology,Beijing 100013,China;iDEA Architects(Shenzhen)Co.,Ltd.,Shenzhen 518052,China;Architectural Design&Research Institute of Tsinghua University Co.,Ltd.,Beijing 100084,China;Duowei i-Building Engineering Design Co.,Ltd.,Beijing 100071,China)
出处
《建筑结构》
CSCD
北大核心
2021年第S01期727-733,共7页
Building Structure
关键词
大跨度空间结构整体结构分析
几何非线性
材料非线性
罕遇地震弹塑性时程分析
显式准静态分析
抗震性能
large-span space whole structure analysis
geometry nonlinear
material nonlinear
rare earthquake elastoplastic time-history analysis
explicit quasi-static analysis
seismic performance
