基于断裂力学的混凝土桥梁疲劳损伤及寿命评估分析

Fatigue Damage and Life Evaluation of Concrete Bridges Based on Fracture Mechanics

在传统分析典型混凝土桥梁疲劳损伤及剩余寿命预测的基础上,根据混凝土桥梁在变幅应力荷载作用下计算疲劳损伤度,建立等效疲劳车模型,通过断裂力学方法和K准则,确定混凝土主要构件的初始裂纹和断裂类型及临界断裂深度,并采用断裂力学方法对湖南省常德市沅水混凝土桥进行疲劳损伤及剩余寿命评估分析.结果表明:断裂力学方法在进行典型混凝土桥梁研究中表现出良好的可信度,是一种非常有研究价值的混凝土桥梁疲劳损伤和剩余寿命的研究评估方法.

Based on the traditional analysis of fatigue damage and remaining life prediction of typical concrete bridges,according to the effect of variable amplitude stress loads on concrete bridges,it calculated the fatigue damage and established the equivalent fatigue cars’model.Based on the fracture mechanics method and K-criterion,after the initial cracks and fracture types of concrete main components and the critical breaking depth are determined,using Fracture Mechanics Method to evaluate and to analyze the fatigue damage and remaining life of the concrete bridge of Yuanshui River in Changde City,Hunan Province.The results showed that the fracture mechanics method is of good credibility in the research of typical concrete bridges,and it is a very research value evaluation method for fatigue damage and remaining life of concrete bridges.