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上海铁路南站屋盖结构平均风荷载的数值模拟
引用本文:顾明,杨伟,傅钦华,周建龙.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(自然科学版),2004,32(2):141-146.
作者姓名:顾明  杨伟  傅钦华  周建龙
作者单位:1. 同济大学,土木工程防灾国家重点实验室,上海,200092
2. 上海铁路局,上海,200071
3. 华东建筑设计研究院有限公司,上海,200002
基金项目:教育部高等学校骨干教师资助计划项目
摘    要:基于CFX 5.5软件平台,利用雷诺应力湍流模型(RSM),对处于大气边界层中的上海铁路南站屋盖结构的平均风压进行了数值模拟.计算结果与测压模型风洞试验数据的对比结果表明,数值计算可以较准确地模拟实际结构的平均风荷载.对于此大跨屋盖结构在结构设计中所关心的上部结构风荷载,另建立了与之对应的3种不同密度网格划分的数值计算模型,并将计算得到的风荷载与根据欧洲规范的计算值进行了比较.此外,通过适当降低悬挑部分的高度以研究几何参数变化对平均风荷载的影响,数值模拟结果说明,适当降低悬挑高度可以显著减小悬挑部分的平均风荷载.

关 键 词:大跨屋盖结构  数值模拟  风荷载
文章编号:0253-374X(2004)02-0141-06

Numerical Simulation of Wind Loads Acting on Roof of Shanghai Railway Station Building
GU Ming,YANG Wei,FU Qin-hua,ZHOU Jian-long.Numerical Simulation of Wind Loads Acting on Roof of Shanghai Railway Station Building[J].Journal of Tongji University(Natural Science),2004,32(2):141-146.
Authors:GU Ming  YANG Wei  FU Qin-hua  ZHOU Jian-long
Abstract:In this paper, mean wind pressures of the roof of Shanghai railway station are computed based on CFX 5. 5 soft platform with Reynolds Stress Model (RSM). Comparisons between the results from the present computation and the wind tunnel test of the building model are then performed, which indicate that the numerical simulation technique can predict the mean wind pressure distribution for practical purpose. In order to compare the wind loads of the superstructure with those from the Europe code,another corresponding computational model is then constructed and the wind loads are computed. Otherwise, further numerical simulations are made for three kinds of roof structures with different cantilever heights to investigate the effects the cantilever height on the drag forces acting on the roof structure. The results show that the mean wind loads on the roof can be reduced evidently by decreasing the cantilever height of the roof.
Keywords:large span roof structure  numerical simulation  wind load
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