大尺度稳态强风地区考虑建筑风效应方向性的新方法  

A New Method for Considering the Directionality of Wind Effect on Structures in Synoptic⁃scale Strong Wind Region of China

作　　者：刘敏[1] 蒋继伟 杨庆山[1,2] 陈新中 黄帅 LIU Min;JIANG Jiwei;YANG Qingshan;CHEN Xinzhong;HUANG Shuai(School of Civil Engineering,Chongqing University,Chongqing 400044,China;Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment,Beijing 100044,China;National Wind Institute,Department of Civil,Environmental and Construction Engineering,Texas Tech Universi-ty,Lubbock TX 79409,USA)

机构地区：[1]重庆大学土木工程学院,重庆400044 [2]结构风工程与城市风环境北京市重点实验室,北京100044 [3]德州理工大学土木、水利与建设工程学院国家风工程研究中心,美国德州拉博客79409

出　　处：《防灾减灾工程学报》2020年第6期884-891,935,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51808077,51720105005);“111”项目(B18062)资助。

摘　　要：首先,介绍了美国、新西兰和日本风荷载规范中关于方向性处理方法的优劣。其次,基于多元极值和条件概率理论,提出了一种按不同风向平均风速极值相互独立处理风荷载/效应方向性的新方法。再次,以哈尔滨、北京和济南为例,分析了我国大尺度稳态强风地区不同风向平均风速极值的相关性特征。最后,以一鞍型屋盖为例,分析了其在大尺度稳态强风地区(以哈尔滨、北京和济南为例)不同建筑朝向下风荷载/效应极值的方向性特征,阐明了美国、新西兰和日本规范中方向性处理方法的局限性,验证了新方法的有效性。研究结果表明:(1)我国大尺度稳态强风地区不同风向平均风速极值趋近于相互独立;(2)所提新方法可以方便、准确的考虑方向性,合理确定风荷载/效应极值;(3)建议该方法作为我国风荷载规范处理风荷载/效应极值方向性的一个方案。Firstly,the methods for dealing with directionality effect in ASCE 7-10,AS/NZS 1170.2:2011 and AIJ-RLB-2004 were investigated and compared.Secondly,on the basis of multivariate ex⁃treme value theory and conditional probability,a new method for treating directionality effect is pro⁃posed based on the independent assumption of extreme wind speed in different directions.Thirdly,the correlation of directional extreme wind speed in different wind directions in the synoptic-scale strong wind region was discussed taking the climate of Harbin,Beijing and Jinan as examples.Finally,the di⁃rectionality of wind loading or effect of a saddle-type roof in synoptic-scale wind region(e.g.,Harbin,Beijing and Jinan)was studied for different structural orientations.Based on cases studies,some possi⁃ble limitations in ASCE 7-10,AS/NZS 1170.2:2011 and AIJ-RLB-2004 were clarified,and the ef⁃fectiveness of the newly proposed method was validated.The research results show that:①the direc⁃tional extreme wind speed in different wind directions in synoptic-scale wind region of China tends to be mutually independent;②the proposed method can deal with the directionality of wind loading or effect and determine their extremums for design correctly and efficiently;③this new method is sug⁃gested as a choice for Chinese wind loading code in dealing with directionality effectively.

关 键 词：大尺度稳态强风 风荷载/效应极值 方向性 风荷载规范 新方法 

分 类 号：TU443[建筑科学—岩土工程]