摘要
张拉薄膜结构是风敏感结构 ,在风力作用下易导致空气动力失稳。这种索膜结构属于强几何非线性结构 ,计算分析中还存在很多问题。同时屋盖为多自由度结构 ,传统上用于节断模型分析的邓哈 -托肯驰振临界风速判别式不再适用。鉴于此 ,本文针对大跨索膜屋盖的结构特点 ,采用体型系数表示的平均风气动力模型 ,考虑风载竖向分量的影响及结构本身的非线性特性 ,用 Newmark法和 Newton Raphson法的思路 ,并借助 ANSYS软件进行分析 ,得出屋盖结构发生横风向驰振时的临界风速 。
Tensile membrane structures are susceptible to wind loading, which easily leads those structures to aerodynamic instability. This kind of cable and membrane structures is characterized by an evident geometrical nonlinearity. Due to this nonlinear feature, it is quite difficult to deal with the analysis of aerodynamic instability of these structures. Furthermore, roofs are of multi degree of freedom, which makes it difficult to use the traditional Glauert Den Hartog criterion to work out the critical wind speed on roofs. Considering the geometrically nonlinear property of tensile roofs, this paper expresses the aerodynamic forces in terms of shape coefficients μ s (i.e. pressure coefficients) instead of μ D and μ L. The influence of the vertical vector of the wind force is also taken into account. Newmark's β method together with Newton Raphson method is used for the response calculation. ANSYS program is adopted to analyze the nonlinear galloping on roofs in the time domain. Finally, with the comparison of different displacement time history curves, the critical wind speed of galloping on roofs is obtained.
出处
《空间结构》
CSCD
2001年第4期15-23,共9页
Spatial Structures
基金
九五国家自然科学基金重大项目资助 (5 9895 4 10 )
关键词
大跨度屋盖
非线性驰振
索膜结构
large span roofs
nonlinear galloping
shape coefficients
