悬索桥在静风荷载作用下的非线性计算分析

Calculation and nonlinear Analysis of Suspension Bridge Under Static Wind Load

为了防止悬索桥在风荷载作用下产生过大变形甚至发生失稳,有必要对其进行非线性计算分析,以确定结构主要构件在风荷载作用下的变形特点,并判断其静风稳定性是否满足要求。以一中等跨径的悬索桥为实例,利用节段模型试验采集三分力系数,采用大型有限元程序ANSYS对其进行静风稳定性非线性计算,得到了悬索桥在递增变化的风荷载作用下的顺风向位移,以及最终发生静风失稳时的临界风速。计算结果表明,桥梁各构件位移随风速的增大而增大,横向屈曲最大风速大于临界风速,该桥的静风稳定性满足要求。

In order to prevent too large deformation especially ones that may lead to instability, it is necessary to do the nonlin-ear calculation and analysis of suspension bridge under wind load. Thus the deformation characteristics of the main structural com-ponents can be found out, and the stability can be detected to determine whether it can meet the requirements. In this paper, a medi-um span suspension bridge is applied as a case, the tri-component force coefficient is collected by a segmental model test, a nonlin-ear calculation is conducted with ANSYS program to explore its aerostatic stability and displacements and critical wind speed of thisbridge under the action of incremental changing wind load are obtained. The calculation results show that the displacements ofbridge components increase along with wind speed and the maximum lateral buckling wind speed is greater than critical wind speed,stability of the bridge can meet the requirements.