大跨度刚性屋盖数值模拟及女儿墙对风压影响分析
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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 CFD 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 corner 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 parapet wall,the greater the wind pressure on the parapet. In the actual project,the adverse effect of wind pressure on the parapet should be considered.
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 CFD 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 corner 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 parapet wall,the greater the wind pressure on the parapet. In the actual project,the adverse effect of wind pressure on the parapet should be considered.
引文
[1]中华人民共和国住房和城乡建设部.建筑结构荷载规范:GB50009—2012[S].北京:中国建筑工业出版社,2012.
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[6]杨立国,杨伟,姜国义,等.温州东海广场风荷载数值模拟与风洞试验研究[J].建筑结构学报,2009(1):144-148.
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[10]刘思为.大跨度空间结构风荷载数值模拟及风振响应研究[D].成都:西南交通大学,2011.
[2]王尚雨.低矮建筑风沙荷载与大跨结构风振系数的研究[D].长沙:湖南大学,2015.
[3]金新杨,杨伟,金海,等.数值引导下的建筑风荷载风洞试验研究[J].建筑结构,2007,37(8):104-107.
[4]顾明,杨伟,傅钦华,等.上海铁路南站屋盖结构平均风荷载的数值模拟[J].同济大学学报,2004(2):104-106.
[5]楼文娟,孙斌,卢旦,等.复杂型体悬挑屋盖风荷载风洞试验与数值模拟[J].建筑结构学报,2007(1):107-112.
[6]杨立国,杨伟,姜国义,等.温州东海广场风荷载数值模拟与风洞试验研究[J].建筑结构学报,2009(1):144-148.
[7]杨伟,金新阳,陈素琴,等.风工程数值模拟中平衡大气边界层的研究与应用[J].土木工程学报,2007,40(2):1-5.
[8]李玉学,白硕,杨庆山,等.大跨度柱面网壳结构风荷载特性风洞试验研究[J].建筑结构学报,2004(4):105-111.
[9]吴迪,武岳,孙瑛,等.大跨度铁路站房屋结构风洞试验与等效静力风荷载[J].建筑结构学报,2012,33(1):43-50.
[10]刘思为.大跨度空间结构风荷载数值模拟及风振响应研究[D].成都:西南交通大学,2011.
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