阶梯型大跨屋盖结构风荷载数值模拟研究  

Numerical Simulation of Wind-induced Loads on Large Span Ladder-type Roof Structures

作　　者：何星星[1] 苏波[1] 石启印[1] 

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《防灾减灾工程学报》2015年第3期307-312,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金青年基金项目(51108210);江苏省博士后基金项目(1301048C)资助

摘　　要：以某阶梯型体育馆为研究对象,基于CFD数值模拟方法,利用RNGκ-ε湍流模型对阶梯型大跨屋盖风荷载进行了研究,并与风洞试验结果进行对比分析,得出阶梯型大跨屋盖结构表面的风压分布及变化规律,为此类复杂体型的大跨结构抗风研究提供依据。结果表明:1CFD数值模拟技术可用于实际结构风荷载的分析研究;2阶梯型屋盖高度差对屋盖表面风压系数有较大影响,高度差较小一侧,屋盖迎风面分块区域的平均风压系数呈负压,高度差较大一侧,屋盖迎风面分块区域的平均风压系数为正压;3此类阶梯型大跨结构屋面风压分布主要以吸力为主;4阶梯型屋盖屋檐处的风压系数较转角凹处小,需对风压系数较高的位置做好预防措施。This paper studies the CFD numerical simulation of wind-induced loads on a large span ladder-type roof structure based on a ladder gymnasium.We analyze the pressure distribution and variation of the surface of ladder-type large span roof structure by using RNGκ-εturbulence model and compared these with the results of wind tunnel tests to provide the research basis of the wind resistance research of such a large span structure.The results show that：（1）the CFD numerical simulation techniques can be applied to the wind load analysis of actual structure;（2）the height difference of ladder-type roof has a greater impact on the roof surface pressure coefficient,and on the windward side of the roof blocks the regional average pressure coefficients are negative on smaller height difference side;and on the windward side of the roof blocks the regional average wind pressure coefficients are positive on the larger height difference side.（3）the wind loads on the roof structure are mainly suctions;（4）The wind pressure coefficient on ladder-type roof eaves is lower than the coefficient on the corner recess,and it is necessary to take preventive measures where the wind pressure coefficient is higher.

关 键 词：数值模拟 阶梯型大跨屋盖结构 风荷载 风压系数 

分 类 号：TU973.32[建筑科学—结构工程]