摘要
车辆通过时桥梁动挠度的测量与加速度测量相比有很多困难,因此考虑由加速度积分求得桥梁的动挠度.车辆进桥时实测振动信号表明桥梁的初始状态不是完全静止的,初始加速度、速度均是未知量.文章对测试加速度进行减去均值处理以消除初始加速度的影响,根据车辆出桥后梁在平衡位置处振动的特性消除初始速度的影响.算例表明,常荷载通过桥梁时由加速度积分所得动挠度与精确解吻合得很好.现场实验表明,采用本文的方法对测试加速度积分计算桥梁的动挠度是可靠和可行的.
It is difficult to direct measure the dynamic deflection compare to measure the acceleration of the bridge. Therefore results in the bridge dynamic deflection according to the acceleration integration have the important project value in the bridge examination aspect. Subtract the mean value from the measuring acceleration can eliminate the influence of the initial acceleration. According to the fact that the bridge is in the position of equilibrium vibration when the vehicles move out of the beam, the influence of the initial velocity can be eliminate. The calculated example indicated that the result of dynamic deflection obtained by acceleration integration is very good according to exact solution. The field test indicated that using the method of this article to calculate the dynamic deflection of the bridge is reliable and feasible.
出处
《广州大学学报（自然科学版）》
CAS
2007年第1期75-78,共4页
Journal of Guangzhou University:Natural Science Edition
关键词
动挠度
加速度
桥梁检测
dynamic deflection
acceleration
bridge measurement
