移动荷载作用下特大悬索桥的行车舒适性

Riding Comfort of Long-span Suspension Bridge under Moving Loads

为研究移动荷载作用下特大悬索桥的动力响应和行车舒适性问题,用正交异性矩形板单元弯曲形函数的6次Hermitian插值函数,通过Matlab编程把车辆移动过桥时的荷载转换成加劲梁各节点的荷载时程,用通用有限元程序ANSYS,对移动荷载作用下特大悬索桥动态响应进行了时程分析,给出了悬索桥在不同荷载作用下的数值分析结果。实例分析表明,该方法具有很好的适用性和很高的精度,加劲梁最大位移响应位于桥梁中跨的跨中位置,发生在移动荷载通过桥梁跨中位置前后。最后,通过对某悬索桥动力响应的时程结果进行小波变换,研究了该悬索桥的行车舒适性。

A method is presented for calculating dynamic response of longspan suspension bridges under moving loads. First, a three- dimensional finite element model is created to represent the bridge.Then the vehicle loads moving on suspension bridge are transformed into equivalent nodal forces （and moments） process, by applying Matlab program based on interpolating shape functions of orthotropic plate element. Then the dynamic response of the bridge structures is obtained by using finite element software ANSYS. The analyse of a numerical example shows that this method is feasible and time saving. At last, the riding comfort of the longspan suspension bridge is studied by using wavelet transform method, and relevant results are put forward.