大跨度刚性屋盖数值模拟及女儿墙对风压影响分析  

LONG-SPAN GYMNASIUM NUMERICAL SIMULATION AND EFFECTS OF PARAPET WALL ON WIND PRESSURE

作　　者：韩淼[1] 王绅 杜红凯[1] 李万钧 韩蓉 HAN Miao;WANG Shen;DU Hongkai;LI Wanjun;HAN Rong(Beijing's Future Urban Design High-Tech Innovation Center,Beijing Energy Conservation and Emission Reduction JointTechnology Innovation Center,Beijing University of Civil Engineering and Archilecture,Beijing 100044,China)

机构地区：[1]北京未来城市设计高精尖创新中心北京节能减排关键技术协同创新中心北京建筑大学,北京100044

出　　处：《工业建筑》2019年第3期104-110,131,共8页Industrial Construction

基　　金：国家重点研发计划(2016YFC0700700)

摘　　要：为研究不同围护结构对主体结构及自身承受风荷载的影响,对三种不同围护结构体系的平屋盖刚性模型(普通平屋盖、设女儿墙平屋盖和设悬挑平屋盖模型)的风洞试验进行CFD数值模拟,数值模拟结果与风洞试验结果吻合较好,利用建立的CFD数值模拟模型,对三种不同高度女儿墙的平屋盖刚性模型进行数值模拟分析。对不同围护结构的屋面风压分析表明:悬挑部分对主体屋面前缘风压降低效果明显;女儿墙设置可减小屋面迎风前缘与角部区域的负值风压,屋盖后部出现了局部正压。对不同高度女儿墙模型数值模拟表明:女儿墙高度主要影响屋面1/3范围内的风压、角部区域风压及屋面风压梯度,女儿墙越高,女儿墙承受风压越大,在实际工程中应考虑风压对女儿墙的不利影响。To study the influences of different envelope structures on the main structure and itself under wind loads, the wind tunnel tests and CFD numerical simulations for three different maintenance systems for flat roof rigid models (ordinary flat roofs, parapet walls, and cantilevered flat roof models) were conducted , the numerical simulation results agreed well with the wind tunnel test data, and the established CED numerical simulation model was used to simulate the rigid roof model of three parapets with different heights. The analysis results of roof wind pressure on different enclosures showed that the cantilevered part had an obvious effect on reducing the wind pressure at the front edge of the main body roof;the parapet wall could reduce the negative wind pressure at the windward front and comer areas of the roof and the local positive pressure appeared at the rear of the roof. The numerical simulations of parapets of different heights showed that the height of the parapet wall mainly affected the wind pressure within 1/3 of the roof, the wind pressure in the corner region and the gradient of the roof wind pressure, the higher the piirapet wall, the greater the wind pressure on the parapet. In the actiuil project, the adverse effect of wind pressure on the parapet should be considered.

关 键 词：平屋盖模型 风洞试验 CFD数值模拟 平均风压系数 女儿墙结构 

分 类 号：TU312.1[建筑科学—结构工程]