外形几何参数对低矮建筑双坡屋盖升力系数极值的影响  

Effects of geometrical parameters on extreme uplift force coefficients on gable-roofs of low-rise buildings

作　　者：全涌[1] 顾明[1] 陈斌[2] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]杭州市市政设施监管中心,浙江杭州321000

出　　处：《建筑结构学报》2011年第4期33-38,共6页Journal of Building Structures

基　　金：国家科技支撑计划项目(2006BAJ06B05;2008BAJ08B14);国家自然科学基金创新研究群体项目(50621062)

摘　　要：对一系列低矮建筑双坡屋盖的刚性模型测压风洞试验数据进行了处理,研究了屋盖升力系数极值的特征,讨论了最不利屋盖升力系数随建筑外形几何参数的变化规律。研究结果表明,屋盖坡角的变化对最不利屋盖升力系数有重要影响:对高宽比相同的低矮建筑,屋面最大升力系数随屋盖坡角增大而减小,且建筑的厚宽比越大,这种趋势越剧烈;最不利屋盖升力系数随着建筑高宽比的增大而增大,但这种增大的趋势随着屋盖坡角的增大而减小。基于这些数据,用多参数最小二乘法将最不利屋盖升力系数拟合成了屋盖坡角、建筑高宽比和厚宽比的函数形式,并对拟合函数进行了误差分析。所得结论及拟合公式可为低矮建筑的结构设计及相关荷载规范的制订和修改提供参考。The pressure measurement wind tunnel test data of a series of low-rise building models were processed.The extreme uplift force coefficients on the roofs were studied.The effects of geometrical parameters on the most unfavorable uplift force coefficients on the gable roofs of low-rise buildings were discussed in this paper.Some new conclusions were drawn from the results.Fixing the ratio of height over width,the most unfavorable uplift force coefficients decrease with the increase of roof pitches and such tendency becomes more dominant with the increase of the ratio of depth over width.The most unfavorable uplift force coefficients increase with the increase of the ratio of height over width and the tendency is recessive for a large roof pitch.Based on those data,the most unfavorable uplift force coefficients are fitted as a function of the roof pitch,aspect ratio and side ratio with the Multi-parametrical Least Squares Method.These conclusions and the fitted function are useful references for wind loads standards and structure design of low-rise buildings.

关 键 词：低矮建筑 双坡屋盖 风洞试验 升力系数极值 

分 类 号：TU312.1[建筑科学—结构工程]