基于Kriging代理模型的平屋盖女儿墙防风效果优化研究  

Aerodynamic Optimization Study of Anti-wind Effects on Parapets of a Flat Roof Based on Kriging Surrogate Model

作　　者：赵友毅 邱冶[1] 伞冰冰[1] ZHAO Youyi;QIU Ye;SAN Bingbing(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学土木与交通学院,南京210098

出　　处：《河南科学》2019年第4期615-621,共7页Henan Science

基　　金：国家自然科学基金青年基金项目(51808194);江苏省自然科学基金项目(BK20170880);中国博士后科学基金资助项目(2016M591754)

摘　　要：为确定平屋盖女儿墙的最优参数,基于Kriging代理模型对45°风向角下女儿墙防风效果进行优化研究.首先,选用标准k-ε、RNG k-ε、SST k-ε和RSM 4种湍流模型对设置女儿墙的平屋盖表面平均风压进行数值模拟,并通过风洞试验进行验证.其次,分别以屋面负压峰值和升力系数最小为优化目标,建立了目标函数的Kriging代理模型,同时对女儿墙的孔洞率和高度进行优化.研究结果表明:当女儿墙孔洞率为87.4%,高度为0.049H(H为屋盖高度)时,屋面负压峰值达最小值;当女儿墙孔洞率和高度分别为1%和0.096H时,屋盖升力系数最小.To determine the optimal parameters of parapets on flat roofs,the anti-wind effects of parapets at an incidence wind direction of 45° were optimized based on Kriging surrogate model.Firstly,four turbulence closure models including standard k-ε,RNG k-ε,SST k-ω and RSM were used to investigate the mean wind pressures on flat roofs with parapets,which were validated by the wind tunnel test.Then the parapet porosity and height optimization was carried out by constructing the Kriging surrogate model,the objectives of which are to minimize the peak negative pressure on the roof surface and the lift force coefficient,respectively.The optimization results showed that,in the case of parapet with porosity of 87.4% and height of 0.049H(H is the roof height),the peak negative pressure reaches its minimum;while in the parapet case with porosity of 1% and height of 0.096H,the smallest lift force coefficient can be obtained.

关 键 词：平屋盖 女儿墙 Kriging代理模型 气动优化 

分 类 号：TU18[建筑科学—建筑理论] TU22