斜拉桥样条有限条三维颤振分析

针对斜拉桥设计中的误差 ,提出采用不等段三次B样条函数描述桥梁板的位移场 ,通过节点线上位移、速度和弹性中心上的位移、速度关系分配空气力 ,由此建立斜拉桥样条有限条三维颤振分析模型。并对天津丹拉海河大桥进行了颤振分析 ,结果表明该方法在数据准备、考虑空气力的空间分配等方面具有很大的优越性 ,且计算方便、可靠 ,具有潜在的运用前景

Three-dimensional Oscillation Analysis of Finite Stripe for Cable-stayed Bridge

As the error during the design of cable stayed bridge, the displacement field of plate girder can be described by using three power B spline function of unequal segments. Through the relations between the displacement, velocity on the node line and the displacement, velocity on the elastic center, the aerodynamic forces may be distributed. Thus, the three dimensional oscillation analysis model of finite stripe can be established for cable stayed bridge, and has been used in carrying out the oscillation analysis for Dan La Hai He Bridge in Tianjin. The result proves that this method has great advantages of data preparation and considering the distribution of aerodynamic forces in space. Besides, it is easy to calculate and reliable, and has latent application prospects.