大跨度变截面门式刚架抗风优化设计研究  

Wind-resistant Optimized Design of Long Span Portal-rigid Frame with Web-tapered Section

作　　者：吴玖荣[1] 董超超[1] 徐安[1] 傅继阳[1] 

机构地区：[1]广州大学土木工程学院,广州510006

出　　处：《武汉理工大学学报》2012年第2期69-74,共6页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51078096;50978063);广东省自然科学基金(07300081);广东省国际科技合作项目(2009B050200015)

摘　　要：在运用考虑背景响应的LRC方法计算等效静力风荷载施加在变截面大跨门式刚架的基础上,通过SAP2000API函数用MATLAB调用有限元分析结果,采用虚功原理构造其位移约束条件,运用拉格朗日乘子法建立优化问题的数学模型。运用最优准则法(OC),探讨了大跨度变截面门式刚架抗风优化设计的相关方法。通过对构造的函数进行迭代求解得出其优化的最小截面,并与峰值因子法求静力风荷载的优化结果进行对比。对比的结果表明:运用OC优化算法收敛的迭代次数较少,且利用LRC方法建立的等效静力风荷载条件下的优化结果更加经济,也更符合风荷载的实际特性。A procedure for wind-resistant optimization design of long-span portal-rigid frame was proposed in this paper by adopting the Optimality Criteria（OC） method and the SAP2000 Application Programming Interface（API） for Matlab software.The Equivalent Static Wind Load（ESWL） imposed on the long-span portal-rigid frame was obtained from the measured wind pressure from wind tunnel tests and application of Load Response Correlation（LRC） method.The virtual-work principle was utilized to construct the wind-induced displacement constraint condition,and the Lagrange multiplier factor was adopted to establish the optimization model for the optimization procedure.A special iteration procedure was selected to obtain the optimization minimum sections of long-span portal frames while satisfying all the constraint conditions.The optimized results imposed by ESWL were also compared with those corresponding optimization results induced by the equivalent wind load from Gust Load Factor（GLF） method.It was shown that few iteration numbers for convergence in the proposed optimization procedure are needed and the OC procedure proposed in this paper was very effective for the wind-resistant optimization design for such long-span portal-rigid frames.

关 键 词：变截面门式刚架 等效静力风荷载 SAP2000应用程序接口 最优准则 

分 类 号：TU337[建筑科学—结构工程]