论文部分内容阅读
采用松耦合方法对索膜结构的风致振动问题进行研究,提出了基于三角形重心坐标系的网格变形插值新方法,并从计算精度和工程适用性的角度对一致网格和非一致网格进行了比较,提出了有效提高计算效率的实用方法。在上述研究的基础上,对上海世博轴索膜结构的风致流固耦合问题进行了数值分析,计算结果表明:流固耦合作用将明显改变索膜结构的动力特性,在索膜结构的风振计算中不容忽视。流固耦合在世博轴索膜结构的风振响应中主要表现在静态耦合作用的增大和瞬态耦合的削弱,且前者的作用超过后者。流固耦合基本不影响大尺度涡对结构的作用。
The wind induced vibration of the cable membrane structure is studied by the loosely coupled method. A new method of mesh deformation interpolation based on the triangular centroid coordinate system is proposed. And the uniform and non-uniform grids are calculated from the viewpoints of calculation accuracy and engineering applicability In comparison, a practical method to improve computational efficiency is proposed. Based on the above studies, the numerical analysis of the wind-induced fluid-structure interaction of the axial membrane structure of Shanghai World Expo is carried out. The results show that the fluid-solid coupling will obviously change the dynamic characteristics of the cable membrane structure. Calculation can not be ignored. The fluid-structure interaction in the wind-induced vibration response of the Expo Axis membrane structure is mainly manifested by the increase of static coupling and the weakening of transient coupling, and the former is more effective than the latter. The fluid-structure interaction basically does not affect the effect of large-scale vortex on the structure.