由响应识别桥上移动荷载

IDENTIFICATION OF MOVING LOADS FROM BRIDGE RESPONSES

本文介绍一种基于欧拉梁振动理论由桥梁响应识别桥上移动时变荷载的方法，用模态叠加法和最小二乘法由桥梁挠度或应变识别梁的模态位移，采用差分方法得到梁的模态速度和模态加速度，由梁的模态座标方程和最小二乘法识别桥上移动荷载，并通过计算机仿真说明测试误差。

In this paper, the method of identification of moving timedependent loads from bridge responses based on Euler beam vibration theory is introduced. The modal displacements of the beam were identified from the deflections on strains of the beam. The modal velocities and accelerations of the beam were calculated with central difference method. The moving forces were identified with the least square method based on the modal coordinate equation of the beam. The influence of test error, load spaces and bridge span on the identification are discussed.