基于SD值法桥梁损伤识别研究

Research on Bridge Damage Identification Based on SD Value Method

本文结合桥梁位移模态、转角模态及曲率模态的相互关系,提出一种可简化计算,减小损伤识别误差的结构曲率方差比SD值法。依托S318线玉门至昌马公路干渠2号桥,建立有限元模型,通过设置损伤工况,分析了桥梁自振频率,位移模态对桥梁损伤识别的影响,并对SD值法损伤识别适用性进行研究。结果表明,本方法可以有效识别结构损伤,并确定局部损伤位置及损伤数量。

This paper combines the interrelationships of the displacement mode,corner mode and curvature mode of the bridge,and proposes a structural curvature variance ratio SD value method that can simplify the calculation and reduce the error of damage identification.Relying on the No.2 bridge of Yumen-Changma highway trunk canal on S318,a finite element model was established.By setting up the damage conditions,the effects of the bridge's self-oscillation frequency and displacement modes on the bridge damage identification were analyzed,and the applicability of the SD method for damage identification was studied.The results show that this method can effectively identify structural damage and determine the local damage location and the amount of damage.