空间结构多维地震响应改进组合准则  

Multicomponent Correlated Combination Rule for MultidimensionalSeismic Response of Spatial Structures

作　　者：曲扬 唐潮[1] 陈刚[1] 程建军[1] 罗永峰[2] QU Yang;TANG Chao;CHEN Gang;CHENG Jianjun;LUO Yongfeng(The Third Construction Co.Ltd.of China Construction Eighth Engineering Division,Nanjing 210046,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]中建八局第三建设有限公司,南京210046 [2]同济大学土木工程学院,上海200092

出　　处：《结构工程师》2023年第5期71-78,共8页Structural Engineers

基　　金：国家自然科学基金资助项目(51378379)。

摘　　要：现有以主轴模型为理论基础的多维地震响应组合准则由于忽略了多维相关性,通常低估空间结构实际的多维地震响应量。针对此问题,首先指出了经典反应谱CQC准则和SRSS准则在多维地震情形下的不足,在此基础上,提出并定义多维分量相关系数,据此量化多维地震动分量之间的相关程度,采用并行计算技术,进行大量多维地震动分量的相关性分析,验证其合理性。将多维分量相关系数引入SRSS准则,提出能够考虑多维地震响应相关性的改进组合准则。将该准则运用于球面网壳和鞍型网壳算例的时程分析和推覆分析响应组合中,并与SRSS准则进行对比分析,计算结果表明:改进组合准则的计算精度较高,最大位移的计算误差控制在15%以内,能够合理预测空间结构多维位移响应的分布规律和变化趋势,显著改善了SRSS准则低估多维响应的缺点,同时保留了较高的分析效率,便于应用。Based on the orthogonal effect,the existing combination rules of multidimensional seismic response usually underestimate the responses of spatial structures,since the coupling effect of earthquake multicomponent is ignored.To address this issue,the limitations of the CQC rule and SRSS rule from conventional response spectrum applied in multidimensional conditions were pointed out.Thereafter,a multicomponent correlation coefficient was proposed and defined to quantify the correlation of multidimensional seismic components.Through extensive correlation analysis of earthquake records using parallel computing technique,the coefficient was proved to be rational and serviceable.On this basis,the coefficient was introduced into the SRSS rule and then the Multicomponent Correlated Combination(MCC)rule was put forward for the multidimensional seismic response of spatial structures.To validate the computational superiority of the MCC rule over the SRSS rule,a spherical latticed shell and a saddle latticed shell were employed for seismic evaluation by means of the pushover method and response history analysis method.The results show that the MCC rule provides more accurate prediction of multi-dimensional response than that by the SRSS rule,especially in terms of response distribution and variation tendency.Calculation errors for maximum displacement are generally less than 15%,which overcomes the drawback of underestimation of the SRSS rule.The MCC rule maintains high computational efficiency,and its application is simple and convenient.

关 键 词：空间结构 多维地震 组合准则 相关性分析 

分 类 号：TU311.3[建筑科学—结构工程]