建筑结构学报2018，Vol.39Issue(1)：21-27,7.DOI:10.14006/j.jzjgxb.2018.01.003
屋盖倾角对悬挑曲面屋盖风压特性的影响
Effect of pitch angles on wind pressures of cantilevered curved roofs
摘要
Abstract
Taking stadium with cantilevered curved roofs as research object,the wind pressure distribution,mean pressure coefficients and peak negative pressure coefficients of large cantilevered spatial roof with three different roof pitches were investigated by wind tunnel experiments.It is found that roof pitch angle have a significant effect on the mean pressure coefficients and peak negative pressure coefficients,especially the roof area affected by the conical vortex or separation and reattachment.However,the change rule of wind pressure distribution to roof slopes is related to the relative position of taps,roof span and initial pitch angles of roof.It is seen that the extreme value of the most unfavorable wind pressure coefficients for the three models are all located at the front edge of roof corner.For the models of M2 and M3 with gradually enlarging roof slopes compared with the model M1,the extreme value of the most unfavorable mean wind pressure coefficients increase by 7.1％ and 13.8％ respectively,and the extreme value of the most unfavorable negative wind pressure coefficient increases by 15.0％ and 11.0％,respectively.The wind pressure coefficients of roof corner,which is dominantly affected by the separation and reattachment of conical vortex,vary consistently at windward edge and reattachment zone.As roof pitch angle rise,the most unfavorable mean pressure coefficients are gradually increasing,while the most unfavorable negative pressure coefficients decrease after increasing.For other roof regions,where the wind pressure coefficients are mainly influenced by separation or reattachment flow separately,the most unfavorable mean and negative pressure coefficients for different taps emerge large deviations with the increasing of roof pitches.The change rule ought to be discussed by individual roof surface.关键词
悬挑屋盖/屋盖倾角/风洞试验/平均风压系数/极小风压系数Key words
cantilevered roof/roof pitch angle/wind tunnel test/mean pressure coefficient/peak negative pressure coefficient分类
建筑与水利引用本文复制引用
刘慕广,谢壮宁,余先锋,石碧青..屋盖倾角对悬挑曲面屋盖风压特性的影响[J].建筑结构学报,2018,39(1):21-27,7.基金项目
国家自然科学基金项目(51208213,51778243),中央高校基本科研业务费专项(2015ZZ018). （51208213,51778243）
