建筑结构学报2013，Vol.34Issue(9)：91-96,6.
大尺度平屋盖聚类最优风压分区研究
Study on clustering optimal design zones of wind pressure on large-scale flat roof
摘要
Abstract
As for the imperfection of design zoning for cladding design in current Chinese loading code,the optimal zoning law of area-averaged wind pressure for a large-scale flat roof cladding design by clustering algorithm is presented in this paper.The most unfavorable point peak pressure is derived considering all the inflow direction.Then different kinds of zoning laws are produced by the shortest distance of clustering algorithm and the optimal zoning law is found by the clustering validity assessment method based on quality coefficient.Finally,the area-averaged pressure is calculated by the optimal zoning law.Four conclusions can be drawn.Three classes of design zones for a large-scale flat roof are divided using the clustering algorithm.The most sensitive zone,10％ of the breadth,is located at the roof corner,which should be paid more attention in the design and construction.The averaged wind pressure coefficient of whole roof results in the conservative design for the middle part of flat roof and the underestimation of wind loads for the roof corner.The extreme wind pressure zones should be determined in advance and the different zones are designed and constructed respectively.Compared with the zoning law in current Chinese loading code and the most common zoning method for area-averaged pressure on large-scale flat roof,it is found that the optimal zoning law derived by clustering algorithm is more reasonable.关键词
大尺度平屋盖/风洞系数/聚类原理/风压分区/极值风压Key words
large-scale flat roof/ wind tunnel test/ clustering algorithm/ zoning of wind pressure/ extreme wind pressures分类
建筑与水利引用本文复制引用
李丹煜,杨庆山,田玉基..大尺度平屋盖聚类最优风压分区研究[J].建筑结构学报,2013,34(9):91-96,6.基金项目
国家自然科学基金重大研究计划重点支持项目集成项目(90815021),高等学校学科创新引智计划项目(B13002),国家自然科学基金项目(91215302),中央高校基本科研业务费专项经费项目(2012YJS089,2013YJS058). （90815021）
