大跨索膜结构空气动力失稳的时程分析法

TIME DOMAIN METHOD OF AERODYNAMIC INSTABILITY ON LARGE-SPAN ROOF STRUCTURES WITH CABLES AND MEMBRANES

采用体型系数表达的空气动力模型 ,将Newmark β法和Newton Raphson法相结合应用于风荷载作用下的非线性动力增量平衡方程中 ,形成大跨索膜结构空气动力失稳分析的时程分析方法。结果表明 ,基于索膜结构强几何非线性特点 ,时程分析方法仍然是行之有效的研究途径 。

An aerodynamic force model which is expressed by shape coefficients was adopted,applying Newmark′s β-method together with Newton Raphson to nonlinear dynamic increment equilibrium equation under wind-loading to obtain a time domain method which was used for aerodynamic instability of large-span cable and membrane structures.The results show that based on the characteristic of strong geometric-nonlinear structures with cables and membranes,the time domain method is effective,and provided for reference to similar problems.