大跨度屋盖等效静风压计算方法  

Calculation method of equivalent static wind pressure on large-span roof

作　　者：陈星宇 谢壮宁[1] 张乐乐 黄用军 黄俊[2] CHEN Xingyu;XIE Zhuangning;ZHANG Lele;HUANG Yongjun;HUANG Jun(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China;South China Company,China Construction Second Engineering Bureau Co.,Ltd,Shenzhen 518048,China;Shenzhen Aube Architectural Engineering Design Co.,Ltd,Shenzhen 518053,China)

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [2]中国建筑第二工程局有限公司华南分公司,广东深圳518048 [3]深圳市欧博工程设计顾问有限公司,广东深圳518053

出　　处：《建筑结构学报》2023年第3期167-174,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51778243);广东省现代土木工程技术重点实验室资助项目(2021B1212040003)。

摘　　要：为解决现有节点形式的大跨度屋盖等效静风荷载应用不便的问题,提出以分块风压方式描述的大跨度屋盖等效静风荷载计算方法。首先根据屋面风荷载分布特征进行分区处理,通过结构风致响应的快速分析,依据区域内节点的弹性恢复力得到各区域包含结构风振影响的等代风压时程,再由等代风压时程相关性和本征正交分解方法计算得到以等代风压为等效目标的分块等效静风压分布。进一步对由于区域平均处理所引起响应的偏差,提出了补偿方法并对分块等效静风压进行修正。针对不同风向等效分析所产生庞大工况数据,基于遗传算法提出一种自动筛选工况的方法,最终获取可以体现屋盖整体受风作用效应特征的最佳等效工况数据。将所提方法应用于某大型机库屋盖的等效风压计算,结果表明:采用补偿修正过的等效静风压能够较好地反映结构的风致响应特点;相比已有的节点荷载方式,分析筛选出来的少量的经过补偿处理的等效静风压工况,可以很好地重现结构的极值位移响应,验证了所提方法的有效性和可靠性。The existing methods which calculate nodal equivalent static wind load(ESWL) are inconvenient for practical application. To address the issue, a new method based on ESWL of zoned pressure was proposed in the paper. Firstly, the roof was zoned into areas according to wind load distribution characteristics. Through the rapid algorithm for wind-induced response analysis, the equivalent wind pressure(EWP) in each area was acquired according to the elastic restoring force of the nodes. Then, taking the EWPs as equivalent targets, the zoned equivalent static wind pressure(ESWP) was derived by the load-response-correlation method and proper orthogonal decomposition. A compensation treatment on ESWP was introduced to correct the deviation in response analysis due to the zone average effect. Finally, a load case selection method based on a genetic algorithm was proposed. The optimized ESWP load cases that fully reproduce the wind load effect on the roof can be acquired automatically, despite a large amount of ESWP load cases due to different wind directions and equivalent targets. The proposed method was applied to the ESWP calculation of a large hangar roof. The results show that the zoned ESWP after compensation can well reflect the hangar’s wind-induced response. Compared with the nodal ESWLs, the extreme displacement response can be sufficiently reproduced using only a few selected ESWP load cases after compensation. Thus, this method is proven to be effective and reliable.

关 键 词：大跨度屋盖 等代风压 等效静风压 荷载响应相关法 遗传算法 

分 类 号：TU311.3[建筑科学—结构工程] TU311.41