基于一致耦合法某大型博物馆结构风致响应精细化研究  

Refined research on wind-induced response of roof structure ofa large museum based on consistent coupled method

作　　者：柯世堂[1] 葛耀君[2] 

机构地区：[1]南京航空航天大学土木工程系,江苏南京210016 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《建筑结构学报》2012年第3期111-117,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(50978203;90715039);科技部国家重点实验室基础研究项目(SLDRCE08-C-02)

摘　　要：针对传统三分量方法中采用SRSS组合背景分量和共振分量获得脉动风总响应的局限,在结构动力学和随机振动理论基础上,推导出结构脉动风总响应的实际理论组合计算式,提出用于补偿背景分量和共振分量之间耦合项的一致耦合法来求解结构的风致响应。该方法从理论上适用于任一复杂柔性结构的风致响应精细化分析。以某大型自然博物馆柔性钢结构为例,采用一致耦合法以及改进的三分量方法进行风致响应计算,并与全模态完全二次型(CQC)法计算结果进行对比分析,结果表明:背景、共振及其交叉项分量均需考虑,其中又以共振分量为主导,并且共振模态之间的耦合效应显著,背景和共振分量之间的交叉项也不能忽略。一致耦合法具有较高的精度和稳定性,是此类结构风振响应机理分析的有效方法。Aiming at the limitations of total fluctuating wind-induced response with combination of background and resonant components using square root of the sum of squares （StlSS） method, the theoretical combination formulas of fluctuating wind-induced responses and ESWLs were derived based on structural dynamics and random vibration theory. The refined analysis method is firstly presented by consistent coupled formula to compensate the coupling component between background and resonant modes. The proposed procedure avoids the integration process of calculating elastic restoring force and completely considers the modal coupling effects, which can be used to calculate the ESWL for any complex structures. The calculation of wind-induced response of steel grid roof structure of a large museum demonstrates the effectiveness and accuracy of the present approach. Finally the characteristics of wind- induced response are obtained. This paper proposes a new way of analyzing characteristics of wind-induced responses and mechanisms of actions.

关 键 词：大型空间结构 风致响应 三分量方法 一致耦合法 耦合分量 

分 类 号：TU393.3[建筑科学—结构工程] TU312.1