考虑旧桥损伤的拼宽T梁桥荷载横向分布计算  

Calculation of load transverse distribution of widening T-beam bridge considering old bridge damage

作　　者：邬晓光[1] 黄成 李院军 殷悦 WU Xiaoguang;HUANG Cheng;LI Yuanjun;YIN Yue(Highway School,Chang’an University,Xi’an 710000,China)

机构地区：[1]长安大学公路学院

出　　处：《铁道科学与工程学报》2019年第9期2233-2239,共7页Journal of Railway Science and Engineering

基　　金：福建省交通运输厅2014年科技计划资助项目(Y-201400006);贵州省交通运输厅科技项目(2015-121-024-1)

摘　　要：现有关于拼宽桥梁荷载横向分布的研究多基于传统的横向分布计算方法,考虑旧桥损伤条件下的拼宽T梁桥荷载横向分布计算少有研究。为了提高拼宽T梁桥内力计算精度,考虑旧桥湿接缝损伤和主梁刚度损伤,并根据荷载试验与外观调查确定竖向剪力折减系数和主梁刚度分配系数,在传统刚接梁法理论的基础上推导出合理的计算方法。依托一座单侧拼宽的9梁式简支T梁桥,将计算得到的横向分布系数与传统刚接梁法、有限元数值法、荷载试验法计算结果进行比较。研究结果表明:计算拼宽T梁桥横向分布系数时,需考虑旧桥损伤的影响,本研究推导的计算方法能够较好地反映拼宽桥梁的实际受力;采用传统刚接梁法计算的拼宽桥梁横向分布系数结果偏于不安全。The existing research on the load transverse distribution of widening bridge is based on the traditional calculation method of the transverse distribution,and there are few studies on the calculation of load transverse distribution of widening T-beam bridge under the condition of old bridge damage.In order to improve the calculation accuracy of the internal force of widening T-beam bridge,considering stiffness damage of wet-joint and stiffness damage of main girder,the reduction ratio of vertical shear force and girder stiffness were determined by load test and visual inspection.Finally,reasonable computing method was deduced on the basis of traditional rigid-jionted beam method.Relying on a 9-girder simply supported T-beam bridge with unilateral widening,the transverse distribution factor calculated by method of this study were compared with calculation results of traditional rigid-jionted beam method、finite element numerical simulation、load test method.The results show:When calculating the transverse distribution factor of widening T-beam bridge,the old bridge damage should be considered,and the calculation method deduced by this study can reflect the actual stress of widening bridge;The transverse distribution factor of widening bridge calculated by traditional rigid-jionted beam method are unsafe.

关 键 词：桥梁工程 横向分布系数 刚接梁法 刚度损伤 湿接缝损伤 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]