交错布局轻型四坡房屋群风致干扰效应研究  

Research on wind-induced interference effect of staggered layout lightweight four-slope buildings

作　　者：颜卫亨[1] 王西凤 代鹏 YAN Weiheng;WANG Xifeng;DAI Peng(School of Civil Engineering,Chang’an University,Xi’an 710061,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《西安理工大学学报》2023年第2期291-300,共10页Journal of Xi'an University of Technology

基　　金：陕西省自然科学基金资助项目(2004E204);中央高校科研专项资金资助项目(创新团队项目2013G328401)。

摘　　要：为研究交错布局轻型四坡房屋群风致干扰效应,利用计算流体动力学软件Fluent,结合TTU低矮建筑实测结果,分析与探讨网格数量、湍流模型、离散格式等技术参数。根据轻型四坡房屋使用情况,设计8个四坡房屋交错布局的布置方式,以反映群体布置疏密程度的房屋间距与房屋平面对应尺寸之比的5种纵、横向疏密系数,3种风向角为参数,进行共75种工况的目标房屋表面风压分布规律数值模拟计算。在此基础上,引入干扰因子量化交错布局目标房屋相对于单体房屋的受扰程度,得到适用于交错布局轻型四坡房屋群抗风设计的风荷载体型系数,为轻型四坡房屋群规划布局和结构设计提供理论依据。分析表明交错布局轻型四坡房屋群间距小于临界间距时,群体风致干扰效应不可忽略,实际设计布局时应引起重视。In order to study the wind-induced interference effect of lightweight four-slope roof buildings under staggered layout,the reasonable setting of technical parameters such as mesh number,turbulence model,and discretization format are analyzed and discussed using the CFD software Fluent based on the field measurement results from the TTU low-rise building.According to the practical use of four-slope roof building,a group layout pattern is designed with 8 four-slope buildings under staggered layout and defined density coefficient reflecting the degree of building group layout density which is the ratio of building interval to the corresponding dimension of building.Thus,3 wind direction angles,5 vertical and 5 horizontal density coefficients are taken as parameters,with a numerical simulation calculation conducted to study the distribution law of wind pressure on the surface of target building under a total of 75 working conditions.On this basis,the interference factor is introduced to quantify the degree of wind-induced interference of target building under staggered layout compared with single layout,with the wind load shape coefficient suitable for wind-resistant design of lightweight four-slope roof buildings under staggered layout obtained that can provide theoretical basis for planning layout and structural design.The analysis result shows that the wind-induced interference effect of lightweight four-slope roof buildings under staggered layout cannot be ignored when building interval is less than critical interval,for which sufficient attention should be paid to the actual layout design.

关 键 词：四坡房屋群 交错布局 数值模拟 干扰效应 干扰因子 体型系数 

分 类 号：TU312[建筑科学—结构工程]