大纵坡曲线连续梁桥顶升加高改造后合理约束体系研究  

Study on Reasonable Restraint System of Curved Continuous Box Girder Bridgewith Large Longitudinal Slope after Jacking and Heightening Renovation

作　　者：蒋汉青 JIANG Hanqing(Guangdong Guanyue Highway&Bridge Co.,Ltd.,Guangzhou 511400,Guangdong,China)

机构地区：[1]广东冠粤路桥有限公司,广东广州511400

出　　处：《广东交通职业技术学院学报》2025年第1期23-29,共7页Journal of Guangdong Communication Polytechnic

摘　　要：针对改扩建项目中部分既有桥梁存在大纵坡、非规则、解除固结墩、顶升加高等特点,以某曲线连续箱梁桥为例,采用非线性时程方法,对顶升前抗震性能进行重新评估,再针对桥梁顶升后约束体系和抗震性能设防标准发生改变的情况,分别选取三种不同类型的支座和约束体系进行抗震效果对比分析。结果表明:设置高阻尼隔震橡胶支座能够有效地改善桥梁墩顶位移与墩身、桩身内力。全桥设置板式橡胶支座能够较为均匀地将地震作用力分配到各个桥墩,但引起桥墩墩顶的位移较大,尤其是过渡墩有发生落梁的可能性,需要进行相应验算或设置防落梁装置。In response to the characteristics of large longitudinal slopes,irregularity,unconsolidated piers,and elevated jacking in some existing bridges in the renovation and expansion project,taking a curved continuous box girder bridge as an example,a nonlinear time history method was used to reevaluate the seismic performance before jacking.Then,three different types of bearings and constraint systems were selected for comparative analysis of seismic performance,and the results showed that setting high damping isolation rubber bearings can effectively improve the displacement at the top of the bridge pier and the internal forces of the pier and pile body.The installation of plate rubber bearings throughout the bridge can evenly distribute seismic forces to each pier,but it causes significant displacement at the top of the pier,especially at transition piers where there is a possibility of falling beams.Therefore,corresponding verification calculations or installation of anti-falling beam devices are required.

关 键 词：桥梁工程 曲线连续箱梁桥 大纵坡 顶升加高 约束体系 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]