多折面体型悬挑钢桁架屋盖结构的风压分布数值模拟研究  

Numerical simulation of wind pressure distribution on the cantilever steel truss roof structure with multi-zigzag plane shape

作　　者：王秀丽[1,2] 王宪统 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《空间结构》2015年第1期26-33,共8页Spatial Structures

基　　金：国家自然科学基金项目(51278236);国家科技支撑计划(2011BAK12B07)

摘　　要：基于Reynolds时均N-S方程与SSTk-ω剪切应力输运模型和BSL-RSM雷诺应力模型,对多折面体型悬挑钢桁架屋盖结构的风压分布进行了数值模拟.采用CFX14.0软件,运用有限体积法对控制微分方程进行离散,并采用SIMPLE压力校正算法实现非线性方程的迭代求解,得到了屋盖表面的平均风压系数,并比较了湍流模型、风向角等因素对屋面风压分布的影响,分析了屋面的风压分布规律及结构的流场分布特性,给出了屋盖在最不利风向下的分区平均风压系数,为该类工程的结构抗风设计提供了参考.The distribution of wind pressure on the cantilever steel truss roof structure with multi-zigzag plane shape are simulated based on the Reynolds time average Navier-Stokes equation with Shear Stress Transport model and BSL-SM Reynolds stress model. The governing differential equations are discreted by using the finite volume method of CFXI4.0 software and the SIMPLE pressure correction algorithm tO realize iterative solution of nonlinear equations. The average wind pressure coefficient on the surface of the roof is obtained. Compared with the effects of turbulence models, wind direction and other factors on wind pressure distribution of the roof, the rule of the wind pressure distribution on the roof and the flow field characteristics of the structure is analyzed. The average wind pressure coefficient of the partition is given when the roof under the most unfavorable wind direction, so the reference is provided for this kind of engineering structure to the wind-resistant design.

关 键 词：多折面体型 悬挑钢桁架屋盖 数值模拟 风压分布 平均风压系数 

分 类 号：TU312.1[建筑科学—结构工程]