风雪共同作用下膜结构雪压分布规律的数值模拟研究  

Numerical Simulation of Regularity of Pressure Distribution on Membrane Structures under Combined Loads of Wind and Snow

作　　者：孙芳锦[1] 殷志祥[2] 

机构地区：[1]辽宁工程技术大学建筑与工程学院,辽宁阜新123000 [2]辽宁工程技术大学研究生学院,辽宁阜新123000

出　　处：《防灾减灾工程学报》2010年第1期83-87,共5页Journal of Disaster Prevention and Mitigation Engineering

基　　金：辽宁省教育厅基金项目(202183391);辽宁工程技术大学优秀青年科学研究基金项目(09236);辽宁工程技术大学博士科研启动基金项目(09-139)资助

摘　　要：对膜结构在风雪共同作用下的雪压分布规律进行了数值模拟研究。首先采用两相流原理对雪漂运动中的空气相和雪相分别进行了数值建模,然后采用CFD数值模拟技术,研究了在风雪共同作用下双坡型膜结构表面的雪荷载分布规律,分析了双坡型膜结构的重要几何参数变化时,雪漂及屋面雪荷载分布的变化规律,总结了双坡型膜屋面在风雪共同作用下的雪压分布规律。结果表明,屋面倾角和屋面宽度是影响风雪共同作用下膜结构表面雪压分布的重要因素,檐口高度和屋面长度是影响膜结构表面雪压分布的次要因素。本文研究为更安全、经济地进行膜结构的抗风雪设计、施工提供了可靠的科学依据。The regularity of pressure distribution on membrane structures,due to combined loads of wind and snow,has been simulated numerically with the CFD technique.First of all,the mathematical model of the mixed motions of air and snow flakes was set up according to the principle of two-phase flows;then the model was solved with the CFD technique to study the pressure distribution on double-slope membrane roofs under combined loads of wind and snow.In the study,the influence on the pressure of several important geometrical parameters has been analyzed to reveal the regularity of pressure distribution on the roofs.The results indicate that the slope angle and the width of the roof are predominant factors to the pressure distribution on it while the influence of the eaves height and the roof length is only secondary.This study may provide a reliable scientific basis for snow resisting designs so that membrane structures can be constructed more safely and economically.

关 键 词：膜结构 风雪共同作用 雪压分布规律 雪漂运动 CFD数值模拟 

分 类 号：TU973.2[建筑科学—结构工程]