摘要
目的提出一种四跨曲线连续梁桥在支座损坏或梁体径向爬移后顶升及顶推修复方法,为类似曲线桥梁的修复提供技术支持.方法以陕西孤山川大桥为例,采用Midas Civil建立三维梁单元有限元模型,探讨曲率半径及不同顶升/顶推方案对曲线梁桥应力分布的影响.结果对竖向顶升施工,梁体应力增量对曲率半径的变化不敏感;当中间墩与相邻两墩顶升量之比为10∶7时,梁体应力增量最小.对于水平顶推方案,沿垂直于弦方向进行顶推产生的应力增量远小于沿径向顶推方案,但当曲率半径R>200 m时,沿径向顶推方案产生的应力增量会陡然降低,此时其也可作为备选方案.结论基于分析结果提出了一种同类曲线连续梁桥梁体顶升/顶推最优处理方案,并将研究成果成功用于孤山川桥的纠偏施工中,陕西孤山川大桥的修复实测梁体应力结果有效地验证了本方案的正确性.
In order to provide a technical support for the repair of similar curved bridges,a method for the repair of four-span curved continuous beam bridge after it bearing damage or radial climbing of the girder body is proposed.Taking GU Shanchuan Bridge in Shaanxi Province as an example,a three-dimensional finite element model of girder element is established by Midas Civil.Then the influence of curvature radius and different jacking-up/pushing-back schemes on stress distribution of curved girder bridge is discussed.Based on the analysis results,an optimal treatment scheme of jacking-up/pushing-back for similar curved continuous girder bridges is proposed.The results show that for vertical jacking-up construction,the stress increment of beam is not sensitive to the change of curvature radius,and the stress increment of beam is the smallest when the ratio of the jacking-up displacement between the middle pier to the two adjacent piers is 10∶7.For horizontal pushing-back scheme,the stress increment generated by pushing along the vertical chord direction is much less than that along the radial direction,but when R>200 m,the stress increment generated by pushing along the radial direction will decrease sharply,which can also be used as an alternative.The research results were successfully applied to the rectification construction of GU Shanchuan Bridge and the correctness of the proposed scheme is validated by the measured stress results of the repaired beam of GU Shanchuan Bridge in Shaanxi Province.
作者
赵成功
赵人达
王永宝
李福海
ZHAO Chenggong;ZHAO Renda;WANG Yongbao;LI Fuhai(School of Civil Engineering,Southwest Jiaotong University,Chengdu,China,610023;College of Architecture and Civil Engineering,Taiyuan University of Technology,Taiyuan,China,030024;National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation,Chengdu,China,610031)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第3期395-403,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51778531)。
关键词
曲线连续梁桥
顶升
顶推
仿真分析
复位纠偏
curved continuous beam bridge
jacking-up
pushing-back
simulation analysis
reset and deviation rectification
