基于风致响应的高层建筑等效静力风荷载优化设计研究

Wind-induced Response Based Equivalent Static Wind Load Optimum Design for Tall Building

针对高层建筑等效静力风荷载的优化问题,提出一种结合风洞试验结果和有限元分析的整体优化方法.首先采用有限元分析程序计算结构动力特性,结合相应模型的风洞试验结果,运用阵风荷载因子法(GLF)计算得到原型结构的等效静力风荷载.然后利用ANSYS的优化工具箱,以高层建筑顶部位移限值为约束条件,建筑物自重最小为目标函数进行优化设计.最后,运用整体优化方法对某60层钢框架结构进行优化设计.结果表明:整体优化后,在满足结构顶部侧移要求的前提下,结构基底等效静力风荷载最大降低了10.71%.同时优化分析结果也证明了本文提出的整体优化方法是可行的.

To optimize the equivalent static wind loads（ESWL）of tall buildings,a global optimization method that combined wind tunnel test results with finite-element analysis was proposed.Dynamic characteristics of structure were computed by finite element analysis,combined with wind tunnel test results of scale model.ESWLs for prototype were calculated through gust load factor（GLF）.Then optimization toolbox of ANSYS was used to optimize ESWL,taking the minimum weight as the target function and the limit top displacement of the tall building as the constraint.Finally,the global optimization method was applied to optimize the ESWL of a 60-storey steel frame structure.The results have shown that the equivalent static wind load can be reduced by 10.71% after optimization,when the optimal design is conducted subjected to the condition to meet the requirement of the top displacement of the tall building.In addition,the feasibility of the global optimization method has also been validated.