损伤的预应力钢筋砼连续箱梁整体刚度模型  

The bending stiffness model of continuous prestressed concrete box girder with multiple damaged

作　　者：李春良[1] 郝达靖 王方彦 白中洋 

机构地区：[1]吉林建筑大学交通科学与工程学院,长春130118

出　　处：《扬州大学学报（自然科学版）》2017年第1期68-73,共6页Journal of Yangzhou University：Natural Science Edition

基　　金：2017年安全生产重特大事故防治关键技术科技资助项目(jilin-0002-2017AQ);吉林省教育厅"十二五"科技计划资助项目(2015265);吉林建筑大学博士后启动基金资助项目(201623);吉林建筑大学国家级大学生创新创业训练资助项目(201610191087)

摘　　要：为解决损伤的预应力钢筋砼连续箱梁抗弯刚度的不连续性和突变性在解析计算中难处理的问题,基于傅里叶级数和二维杆系梁理论,建立了二维平面内多处损伤的预应力钢筋砼连续箱梁整体刚度模型,并针对连续箱梁常见的各类病害进行了抗弯刚度和内力计算.结果表明:整体刚度模型的计算结果与MIDAS软件计算结果一致,说明整体刚度模型能真实地揭示实际损伤的预应力钢筋砼连续箱梁的抗弯刚度重分布规律;同时,将带有离散性与突变性的抗弯刚度进行整体计算,解决了二维平面内连续箱梁力学解析计算时,在损伤位置抗弯刚度突变所带来的困难,对采用解析方法研究连续箱梁的损伤识别具有一定的意义.Based on the Fourier series and the theory of two-dimensional bar-beam,the whole stiffness model of prestressed reinforced concrete continuous box girder with multiple damage in twodimensional plane is established to solve the problem that the discontinuity and abruptness of the prestressed reinforced concrete continuous box girder are difficult to deal with in the analytical calculation.At the same time,the bending stiffness and internal force of various types of diseases common to continuous box girder are calculated.It is found that the calculated results of the whole stiffness model are consistent with the results of MIDAS software,which shows that the integral stiffness model can reveal the redistribution of the bending stiffness of the prestressed reinforced concrete continuous box girder.At the same time,the bending stiffness with discrete and abruptness is calculated,which solves the difficulties caused by the abrupt change of flexural rigidity in the damage position of the two-dimensional continuous box girder.It is of great significance to study the damage identification of continuous box girder by using analytical method.

关 键 词：预应力钢筋砼连续箱梁 局部损伤 抗弯刚度 傅立叶级数 整体模型 

分 类 号：U441.4[建筑科学—桥梁与隧道工程] U448.21[交通运输工程—道路与铁道工程]