半整体式桥台无伸缩缝桥静力分析

为了克服桥梁伸缩缝病害,考虑了桥梁上部结构、下部结构和基地土的共同作用,建立了半整体式桥台无伸缩缝桥的静力计算模型。以一座长100 m PC连续箱梁桥为例,对该桥在重力、车辆和季节性温度变化荷载作用下进行了弹性大变形分析,对相应的有伸缩缝桥和整体式桥台无伸缩缝桥分析结果进行了对比。结果表明:半整体式桥台无伸缩缝桥主梁的弯矩、剪力、挠度和下部结构的轴力与有伸缩缝桥接近,但主梁中出现了轴力,下部结构弯矩和剪力较有伸缩缝桥大,说明半整体式桥台无伸缩缝桥消除了伸缩缝的病害,结构整体刚度大,是一种有应用推广价值的桥型。

Static Analysis of Semi-Integral Abutment Jointless Bridge

To overcome the damage of bridge expansion joint,a static analysis model of semi-integral abutment jointless bridge was presented,the interactions among the superstructure,substructure and soil foundation of bridge were analyzed,a 100 m PC continuous box beam bridge with semi-integral abutment was studied by nonlinear geometric finite element method,the forces and deformations of the bridge undergoing dead load,vehicle load and temperature change load were obtained,the computation results of corresponding bridge with joint and integral abutment were compared.Analysis result indicates that the bending moment,shear force and deflection of the main girder and the axial force of the substructure for jointless bridge with semi-integral abutment are close to that of joint bridge,axial force appears in the main girder of jointless bridge,the bending moment and shear force of its substructure are bigger than that of joint bridge.As the damage of bridge joint is eliminated and the global stiffness of bridge structure is increased,semi-integral abutment jointless bridge is worth of application and popularization.(3 tabs,) 8 figs,8 refs.