作　　者： ; ; ; ; ;

机构地区： 南京航空航天大学航空宇航学院土木工程系

出　　处： 《振动．测试与诊断》 2013年第5期824-830,913,共7页

摘　　要： 在模态加速度法和荷载-响应相关法的基础上,推导出超大型冷却塔等效静力风荷载(简称ESWLs)的精细化计算方法,提出用于补偿背景和共振交叉项的一致耦合方法(consistent coupled method,简称CCM)来求解结构ESWLs。该方法采用统一理论进行背景、共振和交叉项3个分量的求解,能完全考虑各共振模态之间、共振和背景模态之间的耦合效应,并赋予背景与共振交叉项ESWLs分量以明确的物理意义。以内陆某核电超大型冷却塔(塔高215m)为例,采用CCM方法进行ESWLs计算,探讨了ESWLs平均、背景、共振和交叉项分量的分布特征,并结合规范条款对比分析了超大型冷却塔风振系数的数值和分布特征,为超大型冷却塔结构设计和抗风安全性提供参考。 A new approach for analyzing wind-induced response and corresponding equivalent static wind loads(hereafter referred to as ESWLs)is firstly presented by consistent coupling method(hereafter referred to as CCM)based on modal acceleration method and load-responses correlation method.Firstly,the refined definition of cross term between background and resonant component is explained based on modeacceleration method,the covariance matrixes of coupling elastic restoring force and resonant elastic restoring force are proposed;secondly,CCM is put forward based on covariance matrix theory,which calculates background,resonant component and cross term,,and the ESWLs of every component is derived by load-response-correlation theory.Finally,the calculation of wind-induced response and ESWLs for long span roof demonstrates the superiority and effectiveness of the present approach,the characteristics of wind-induced response are extracted.A new thought is proposed to analyze characteristics of wind-induced responses and mechanisms of actions.

关 键 词： 超大型冷却塔 等效静力风荷载 一致耦合方法 风振系数 耦合效应

领　　域： [建筑科学] [建筑科学]