【摘要】 利用系统动力参数进行土木工程结构的损伤识别已经成为了一个非常重要的研究领域,因此需要一种利用损伤前后动力参数的变化进行损伤评估和定位的有效方法,系统的动力参数必须尽可能的精确。本文通过有限元方法对一简支梁桥进行动力分析,利用壳单元对桥面进行离散化,通过降低刚度来模拟损伤,进行损伤前后动力参数计算,可以发现损伤前后固有频率的变化。利用位移模态提取的曲率模态进行损伤定位要比位移模态更敏感。更多还原

【Abstract】 Using the system dynamic parameters to identify the damage of civil engineering structure has become a very important research area,therefore we need a effective method to make damage assessment and positioning with the dynamic parameters changes before damage and the dynamic parameters must be as precise as possible.This paper makes dynamic analysis of a simple beam bridge with a finite element method,uses shell element to take discretization on the bridge deck,simulates damage by reducing the stiffness,and calculates dynamic parameters before and after damage,then we can find the changes of inherent frequency before and after damage.Using the curvature mode by displacement modal to conduct damage location is more sensitive than displacement modes.更多还原