北京大兴国际机场航站楼屋盖大跨度钢结构动力特性及多维地震响应分析  

Dynamic characteristics and multi-dimensional seismic response analysis of long span roof steel structure of Beijing Daxing International Airport Terminal Building

作　　者：张爱林[1,2] 牟俊霖 刘学春[1,2] 方浩 马晓飞[1] 束伟农[3] 朱忠义[3] Zhang Ailin;Mu Junlin;Liu Xuechun;Fang Hao;Ma Xiaofei;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：《建筑结构》2019年第14期1-7,17,共8页Building Structure

基　　金：北京市科技计划(Z161100001216010)

摘　　要：北京大兴国际机场航站楼屋盖钢结构在长度和跨度方面超过规范限值,为了研究不同地震输入维数以及地震输入角度对结构响应的影响,对屋盖及其支承结构的整体结构进行了动力特性分析和多维地震作用下的时程分析。研究结果表明:结构的自振频率分布密集,结构低阶振型主要为整体振动,振型形态的对称性和空间振动特征比较明显。在地震作用下结构响应的总体变化规律为随着地震输入维数的增加而增大,不同结构响应参数受地震输入维数的影响程度不一致。不同的地震波对结构响应的影响程度存在差异,在时程分析时对地震波的正确选取十分重要。不同的结构响应参数的最不利地震动输入角度不一致,与地震波的选择存在相关性。地震动按最不利地震动输入角度输入分析结果比按结构主轴方向输入分析结果最大超过了50%,有必要进行最不利地震动输入角度分析。The length and span of the roof steel structure of Beijing Daxing International Airport Terminal Building exceed the specification limits. In order to study the influence of different seismic input dimensions and angles on the structural response, dynamic characteristics analysis and time history analysis under multi-dimensional earthquake of the overall structure of roof and its supporting structure were carried out. The results indicate that the natural frequency of the structure is densely distributed. The low-order modes of the structure are mainly the overall vibrations. The symmetry and spatial vibration characteristics of the mode shape are obvious. The general variation law of structural response under earthquake increases with the increase of seismic input dimension. Different structural response parameters are affected differently by the dimension of seismic input. The correct selection of seismic wave records during time-history analysis is significant because different seismic wave records have different effects on structural response. The critical angles of ground motion input of different structural response parameters are inconsistent and have a correlation with the selection of seismic wave records. The maximum result of seismic wave records input at critical angle is more than 50% compared with the result of seismic wave records input at the direction of the main axis of the structure. It is necessary to perform the analysis of seismic wave records input at critical angle.

关 键 词：北京大兴国际机场航站楼 大跨度钢结构 动力特性 多维地震 时程分析 最不利角度 

分 类 号：TU393.3[建筑科学—结构工程]