基于修正LRC的响应分组法求解等效静力风荷载  

Response grouping method for calculating equivalent static wind loads based on modified LRC

作　　者：周晅毅[1] 顾明[1] 李刚[2] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]广东省公路勘察规划设计院有限公司,广东广州510507

出　　处：《振动工程学报》2010年第2期158-166,共9页Journal of Vibration Engineering

基　　金：国家自然科学基金(50608060);国家自然科学基金创新研究群体科学基金(50621062);科技部科技支撑计划(2006BAJ06B05)联合资助项目

摘　　要：对计算背景等效静力风荷载的传统LRC法进行修正,提出用修正LRC方法直接计算大跨结构的风致峰值响应,以避免求解大跨屋盖等效荷载多阶共振分量的繁琐过程。共振分量部分在背景等效风荷载中得到补偿,从而直接计算包含背景和共振分量的动力分量;补偿的方法是给背景分量的每个元素乘上一个待定的修正系数,该系数由数值方法来确定。基于修正LRC方法,提出了对目标等效响应的分组原则,即根据各组等效静力风荷载在其他响应上的等效精度来确定分组的标准,然后采用响应分组的思路求解等效静力风荷载。该方法可用于计算大跨结构的多个目标峰值响应,克服了传统方法仅能等效单个响应的缺陷。Based on an improvement of LRC method, a modified LRC method that regards peak responses as the target is proposed in the present paper. For large-span roofs, it is well known that several mode shapes should be considered in the process of equivalent inertia forces of resonant components, so the time-consuming process of computing resonant components is proposed in the new method. For the sake of considering the resonant component, each original element in background component is multiplied by a modified coefficient. Based on the modified LRC method, the response grouping principle is present to calculate equivalent static wind loads for large-span roof. The main idea is that the responses whose equivalent static wind loads are similar to each other are selected in a same group. If the calculating error of one response when the structure subjected the equivalent static wind loads aiming at other response are small, the two responses could be chosen into a same group. And the universal equivalent static wind loads of the groups are calculated based on least square principles, which can reproduce simultaneously several peak responses.

关 键 词：大跨度屋盖结构 等效静力风荷载 背景分量 共振分量 修正LRC法 

分 类 号：TU311.3[建筑科学—结构工程] TU312.1