预应力轨枕的损伤演化和寿命估算方法  

Damage evolution theory and life evaluating method for prestressed sleeper

作　　者：彭华[1] 王均星[2] 乐运国[1] 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072 [2]武汉大学水利水电工程学院,湖北武汉430072

出　　处：《铁道学报》2001年第5期70-74,共5页Journal of the China Railway Society

摘　　要：基于连续损伤力学基本概念、理论与方法 ,论述了预应力轨枕在其自身徐变与其它疲劳荷载二者交互作用下的材质劣化损伤行为及其损伤失效机理 ;提出了预应力轨枕在徐变与疲劳交互作用下的损伤本构关系模型 ,建立了用于预应力轨枕分析的力学基本方程与参变量变分原理 ,并利用“间置加载”型载荷谱的特点 ,提出两个基本假设 ,以突出预应力轨枕在徐变与疲劳交互作用过程中的主要特征。可依据初始循环应力场 ,对损伤过程中的循环应力场进行更有效描述 ,从而为更好地解决预应力轨枕分析中寿命估算及对一些实际问题处理 。Based on the basic concept & theory and method of sequent damage mechanics, this paper discusses the damage action and damage failure mechanism of the prestressed sleeper with interaction of creep and other fatigue load. The damage constitutive relation model of the prestressed sleeper with interaction of creep and other fatigue load is proposed. The basic equations of mechanics and variable variational principle for analyzing the prestressed sleeper are built. Using the characteristics of the well known 'between place cut in' load table, two assumes are given that extrude the main feature of the prestressed sleeper in the process of interaction of creep and fatigue. In order to propose a new structural analysis method for better solving the life evaluation in the prestressed sleeper analysis and for dealing with practical problems, there is a more effective description of circling stress field in the damage from the original circling stress field.

关 键 词：预应力轨枕 寿命 估算方法 徐变损伤 疲劳损伤 损伤演化 

分 类 号：U213.34[交通运输工程—道路与铁道工程] U213.42