- 摘 要
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（1 北京工業(yè)大學建筑工程學院， 北京 100124； 2 北京工業(yè)大學北京市高層和大跨度預應力鋼結(jié)構(gòu)工程技術中心， 北京 100124； 3 北京市建筑設計研究院有限公司， 北京 100045）
［摘要］北京大興國際機場航站樓屋蓋鋼結(jié)構(gòu)在長度和跨度方面超過規(guī)范限值，為了研究不同地震輸入維數(shù)以及地震輸入角度對結(jié)構(gòu)響應的影響，對屋蓋及其支承結(jié)構(gòu)的整體結(jié)構(gòu)進行了動力特性分析和多維地震作用下的時程分析。研究結(jié)果表明：結(jié)構(gòu)的自振頻率分布密集，結(jié)構(gòu)低階振型主要為整體振動，振型形態(tài)的對稱性和空間振動特征比較明顯。在地震作用下結(jié)構(gòu)響應的總體變化規(guī)律為隨著地震輸入維數(shù)的增加而增大，不同結(jié)構(gòu)響應參數(shù)受地震輸入維數(shù)的影響程度不一致。不同的地震波對結(jié)構(gòu)響應的影響程度存在差異，在時程分析時對地震波的正確選取十分重要。不同的結(jié)構(gòu)響應參數(shù)的最不利地震動輸入角度不一致，與地震波的選擇存在相關性。地震動按最不利地震動輸入角度輸入分析結(jié)果比按結(jié)構(gòu)主軸方向輸入分析結(jié)果最大超過了50%，有必要進行最不利地震動輸入角度分析。
［關鍵詞］北京大興國際機場航站樓； 大跨度鋼結(jié)構(gòu)； 動力特性； 多維地震； 時程分析； 最不利角度
中圖分類號：TU393-3文獻標識碼：A文章編號：1002-848X(2019)14-0001-07
Dynamic characteristics and multi-dimensional seismic response analysis of long span roof steel structure of Beijing Daxing International Airport Terminal Building
Zhang Ailin1,2， Mu Junlin1， Liu Xuechun1,2， Fang Hao1， Ma Xiaofei1， Shu Weinong3， Zhu Zhongyi3
(1 College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China; 2 Beijing Engineering Research Center of High-Rise and Large-Span Prestressed Steel Structure, Beijing University of Technology, Beijing 100124, China; 3 Beijing Institute of Architectural Design(Group) Co., Ltd., Beijing 100045, China)
Abstract: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.
Keywords:Beijing Daxing International Airport Terminal Building; long span steel structure; dynamic characteristics; multi-dimensional earthquake; time history analysis; critical angle
*北京市科技計劃（Z161100001216010）。
作者簡介：張愛林，博士，教授，博士生導師，Email: zhangal@bjut.edu.cn。
