北京大兴国际机场航站楼大跨度钢结构C5区地震响应分析  

Seismic Responses Analysis of Long-Span Steel Structure in C5 District of Beijing Daxing International Airport

作　　者：张爱林[1,2] 方浩 刘学春[1,2] 牟俊霖 束伟农[3] 朱忠义[3] ZHANG Ailin;FANG Hao;LIU Xuechun;MU Junlin;SHU Weinong;ZHU Zhongyi(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of High-Rise and Large-Span Prestressed Steel Structure,Beijing University of Technology,Beijing 100124,China;Beijing Institute of Architectural Design(Group)Co.,Ltd.,Beijing 100045,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京工业大学北京市高层和大跨度预应力钢结构工程技术研究中心,北京100124 [3]北京市建筑设计研究院有限公司,北京100045

出　　处：《建筑钢结构进展》2021年第1期25-30,共6页Progress in Steel Building Structures

基　　金：北京市科技计划项目(Z161100001216010)。

摘　　要：北京大兴国际机场航站楼大跨度钢结构C5区为双层网壳结构,结构形式复杂,杆件众多,其抗震性能是设计与分析中的关键问题。对C5区建立有限元模型,首先进行了自振模态分析,初步了解了其动力特性。然后,根据规范合理选择地震波,进行动力时程分析,研究了模型在8度多遇及罕遇地震作用下的动力响应和杆件内力情况。分析结果表明:C5区的自振频率分布十分密集,振型以竖向振动为主且对称出现;在8度多遇地震作用下,整体杆件地震内力系数均处于较低水平,上弦及下弦杆件的地震内力系数稍大,受地震作用影响较大;在8度罕遇地震作用下,上、下弦极少数杆件的应力进入塑性范围,其余杆件的应力均处于弹性范围内,整体塑性发展程度较弱;在8度多遇及罕遇地震作用下,结构的层间位移角、剪重比等指标均满足规范要求。总体来说,结构在8度多遇及罕遇地震作用下能实现"小震不坏、大震不倒"的抗震设防水准要求,抗震性能良好。The long-span steel structure in C5 district of Beijing Daxing International Airport is a double layer reticulated shell structure.It has complicated curved surface and many link members.The seismic performance is one of the key problems in the design and analysis.A finite element model of C5 district is built.Firstly,natural vibration mode analysis is carried out to understand the dynamic characteristics.Then,according to the Standard,seismic waves are reasonably selected,and a time-history analysis is carried out.The dynamic response of the model and the internal force of the member under the 8 degree frequent and rare earthquake are studied.The results show that the frequency is very dense.The vibration modes are mainly vertical vibration and appear symmetrically.Under 8 degree frequent earthquake,the seismic internal force coefficient of the integral member is at a low level,and the seismic internal force coefficient of the upper and lower chords are slightly larger,which is greatly affected by the earthquake.Under 8 degree rare earthquake,a small number of members of the upper and lower chord members enter plastic stage,and the stresses of other members are still in elastic range.The overall plasticity development is small.The inter-layer displacement angle and shear-to-weight ratio of the structure meet the requirements of the specification under 8 degree frequent and rare earthquake.In general,the structure can can meet the requirements of seismic fortification level"no damage under small earthquake,no collapsing under strong earthquake"under 8 degree frequent and rare earthquake.The seismic performance of the C5 district is good.

关 键 词：双层网壳结构 自振模态 地震波 动力时程分析 抗震性能 

分 类 号：TU393.3[建筑科学—结构工程]