桥梁损伤的一种振动检测方法

Vibration test method for identification of bridge damage

基于有限元的梁模型,并且运用数理统计原理,探讨了桥梁损伤的一种振动检测方法,推导了相关的公式。分析中只需要模态振型,不需要频率、阻尼等参数;计算相对简单,不需要解方程组;可以识别出结构中多个单元的损伤。将这一方法应用于一座实桥的损伤定位中,取得了初步的结果。工程实例表明,该方法是一种近似的方法,还存在着一定的误差,但简单有效,适于在工程中应用。

Based on the beam model of finite element method and with applied mathematical theory of statistics, a vibrational test method for identification of bridge damage is discussed. The corresponding formula is presented. The analysis only needs model mode and doesn＇t need the other parameters, such as frequency and damping. The calculation is relatively simple and solving system of equations is not necessary. And structural damage of several elements can be identified. The primary result is achieved by applying this method to identify the damage locations of a real bridge. The result shows that this method is an approximate one, and some errors exist, but is simple, effective, and suitable for engineering application.