低矮建筑风驱雨压分布特性及其机理分析  

Distribution characteristics and mechanism analysis of wind-driven rain pressure on low-rise buildings

作　　者：戴成元 陈小宇 张浩 孙芳锦 DAI Chengyuan;CHEN Xiaoyua;ZHANG Haoa;SUN Fangjina(College of Civil Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Green Building Materials and Construction Industrialization,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学土木工程学院,广西桂林541004 [2]桂林理工大学广西绿色建材与建筑工业化重点实验室,广西桂林541004

出　　处：《桂林理工大学学报》2024年第3期455-463,共9页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51108345);广西绿色建材与建筑工业化重点实验室基金项目(桂科能22-J-21-28);广西自然科学基金联合培育项目(2019GXNSFAA245037);广西青年创新人才科研专项(桂科AD19245012)。

摘　　要：采用欧拉-欧拉多相流模型,在利用实测数据验证数值方法的基础上,对TTU单体低矮建筑进行在风雨共同作用下的风雨场模拟,对比分析9种风驱雨工况下风速和雨强与低矮建筑迎风墙面最大风驱雨压之间的关系;对群体低矮建筑在不同布局、不同间距的工况下进行风驱雨压数值模拟,分析WDR雨压分布特性及气动干扰效应下群体建筑风驱雨压特性存在差异的主要原因。基于风雨流场对风驱雨压特性的机理分析可知,气流在前后排建筑之间形成漩涡,风驱雨压在等高区域较单体有所减小,两侧明显增加;气流在左右列建筑之间进行交汇,气流挤压造成建筑内侧风驱雨压高于建筑外侧。单、群体低矮建筑的最大WDR荷载可分别达到纯风荷载的13.39%、 30.03%。结果表明:风雨场中的雨相附加荷载不容忽视,在结构设计时应考虑建筑顶部的荷载验算,提高设计强度。此外,群体建筑布局应适当增加安全间距,避免气流阻塞效应造成的不利影响。The Euler-Euler multiphase flow model is used to simulate wind and rain field of TTU single low buildingunder the combined action of wind and rain, and the relationship between wind speed, rain intensity and themaximum wind-driven rain pressure on the windward wall of low building under nine wind-driven rain conditions iscompared and analyzed. The numerical simulation of wind-driven rain pressure of group low buildings under differentlayout and different spacing is carried out, and the main reasons for the difference of wind-driven rain pressuredistribution characteristics of WDR and aerodynamic interference effect are analyzed. Based on the mechanismanalysis of wind-driven rain pressure characteristics of wind-rain flow field, the airflow forms a vortex betweenthe front and rear buildings. The wind-driven rain pressure is reduced in the contour area compared with thesingle body, and the two sides increase obviously. The air flow converges between the left and right buildings,and the wind-driven rain pressure on the inside of the building is higher than that on the outside. The maximumWDR load of single and group low buildings can reach 13. 39% and 30. 03% of the pure wind load respectively.The results show that the additional rain load in the wind-rain field cannot be ignored, and the load check calculationon the top of the building should be considered in the structural design to improve the design strength. In addition,the layout of the group building should appropriately increase the safety spacing to avoid the adverse effectscaused by the airflow blocking effect.

关 键 词：风驱雨压 风速流场 欧拉-欧拉多相流模型 数值模拟 低矮建筑 

分 类 号：TU312[建筑科学—结构工程]