钢筋混凝土曲线箱梁的偏载效应讨论  

Discussion on the Asymmetrical Loading Effect of Reinforced Concrete Curved Box Girders

作　　者：郭立业 GUO Liye

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《上海公路》2024年第4期97-99,M0006,共4页Shanghai Highways

摘　　要：为分析钢筋混凝土曲线箱梁的偏载效应,结合桥梁宽度为10 m、跨径为(19.974+3×21)m、平面曲线半径70 m的等高连续箱梁的具体工程实例,建立单梁杆系模型和梁格模型,对相应截面的剪力、弯矩计算结果进行讨论。结果表明,恒载和汽车荷载作用下,主梁的受力均存在较不利的偏载效应。其中,汽车荷载作用下的偏载系数较大,远大于习惯所采用的偏载系数1.15,仅根据单梁杆系模型计算结果来进行设计偏不安全。因此,对于曲线或较复杂的桥梁,应采用更精细化的有限元模型进行复核。To analyze the asymmetric loading effects of reinforced concrete curved box girder,this study examines with a specific engineering case of a continuous box girder with a bridge width of 10 m,spans of(19.974+3×21) m,and a plane curve radius of 70 m.Single beam rod system and beam grid models are established,and the shear and bending moment calculation results of the corresponding sections are discussed.The results indicate that under both constant load and vehicle load,the main beam experiences significant adverse asymmetric loading effects.Particularly,the deflection coefficient under vehicle load is considerably higher than the commonly used deflection coefficient of 1.15,indicating that relying solely on the single-beam rod system model for design is unsafe.Therefore,for curved or complex bridges,a more refined finite element model should be used for verification.

关 键 词：曲线箱梁 偏载效应 单梁模型 梁格模型 

分 类 号：U441[建筑科学—桥梁与隧道工程]