曲率半径对连续刚构桥成桥阶段受力影响  

Influence of curvature radius on the stress of continuous rigid frame bridge

作　　者：郭云锋 钱媛媛 GUO Yunfeng;QIAN Yuanyuan(Hubei Communications Planning and Design Institute Co.,Ltd.,Wuhan Hubei 430051 China)

机构地区：[1]湖北省交通规划设计院股份有限公司,湖北武汉430051

出　　处：《山东交通科技》2023年第1期56-59,共4页

摘　　要：为研究曲率半径对曲线刚构桥成桥阶段受力的影响,借助有限元软件建立不同曲率半径的连续刚构桥数值模型,并针对曲线刚构桥的主墩纵向弯矩、主梁扭矩、主墩剪力以及桥台支座反力的变化规律进行对比分析。结果表明:曲率半径的增大会使曲线刚构桥的主墩弯矩和剪力出现小幅降低,但对于曲线刚构桥整体结构受力的影响可忽略不计;曲率半径的增大会增大2#墩截面的最大扭矩,但同时会降低3#墩截面的最大扭矩,且两墩间的扭矩差值会越来越小,可使主梁扭矩分布更为均匀;曲率半径的增大会降低2#、3#墩的支座反力,同时两墩间的支座反力差值也越来越小,可使桥台支座反力分布更为均匀,有利于保障曲线刚构桥的结构安全性。In order to study the influence of curvature radius on the stress of curved rigid frame bridge in the completion stage,the numerical models of continuous rigid frame bridge with different curvature radius are established with the help of finite element software,and the variation laws of main pier longitudinal bending moment,main beam torque,main pier shear force and abutment support reaction of curved rigid frame bridge are compared and analyzed.The results show that the increase of curvature radius will slightly reduce the bending moment and shear force of the main pier of the curved rigid frame bridge,but the influence on the overall structure of the curved rigid frame bridge can be ignored.The increase of curvature radius will increase the maximum torque of 2#pier section,but at the same time,it will reduce the maximum torque of 3#pier section,and the torque difference between the two piers will be smaller and smaller,which can make the torque distribution of the main beam more uniform.The increase of curvature radius will reduce the bearing reaction of 2#,3#piers,and the difference of bearing reaction between two piers is also smaller and smaller,which can make the abutment bearing reaction distribution more uniform,which is conducive to ensuring the structural safety of curved rigid frame bridge.

关 键 词：曲线刚构桥 曲率半径 成桥 受力 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]