流线型单脊膜结构表面风压特性数值模拟分析  

NUMERICAL SIMULATION ANALYSIS OF WIND PRESSURE CHARACTERISTICS ON STREAMLINED MEMBRANE STRUCTURE WITH A SINGLE RIDGE

作　　者：张虎跃 王秀丽[2] ZHANG Huyue;WANG Xiuli(College of Water&Architectural Engineering,Shihezi University,Shihezi 832003,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832003 [2]兰州理工大学土木工程学院,兰州730050

出　　处：《工业建筑》2021年第7期90-97,共8页Industrial Construction

摘　　要：风荷载是大跨度空间结构及膜结构设计的控制荷载。以流线型单脊膜结构的实际工程为例,基于Reynolds时均方程,选取剪切应力传输湍流模型(SST k-ω模型),采用ANSYS-CFX14.0流体分析软件对膜表面的风压分布进行数值模拟。通过对比分析不同风向角下膜表面风压分布规律、平均风压系数及湍流特征,得出该结构最不利风向角取值范围以及膜表面不同分区平均风压系数、风荷载体型系数值。结果表明:60°~90°为此结构的最不利风向角,在此风向角区间内,膜结构表面的湍流特性复杂多变。迎风面屋檐形成较高的正压,背风面屋脊形成较高的负压,该部位更易遭受破坏;整个背风面形成较大的负压区,在结构中部产生明显的漩涡,主要表现为吸力。A wind load is the control load in the design of long-span space structure and membrane structure.Taking a practical engineering of streamlined membrane structure with a single ridge as an example,based on the Reynolds time averaged equation and shear stress transfer turbulence model(the SST k-ωmodel),the distribution of wind pressure on the membrane surface was simulated by ANSYS-CFX 14.0.By comparing and analyzing the distribution of wind pressure,the coefficients of mean wind pressure and turbulence characteristics on the membrane surface in different wind directions,the value ranges of the most unfavorable wind directions,the coefficients of mean wind pressure and the shape coefficients of wind load in different zones on the membrane surface were obtained.The study results showed that the most unfavorable wind direction were between 60°and 90°for the structure,and in the wind directions,the turbulence characteristics on the surface of membrane structure were complex and changeable.The eaves in the windward side formed a higher positive pressure,while the roof ridge in the leeward side formed a higher negative pressure,which made the part more easily damage.A large negative pressure area was formed on the ridge of the leeward side,and the obvious vortex was generated in the middle of the structure,which was mainly represented by suction.

关 键 词：流线型单脊膜结构 风压分布 平均风压系数 体型系数 数值模拟 

分 类 号：TU312.1[建筑科学—结构工程]