斜交角度对简支转连续斜T梁桥受力影响研究

Influence of Skew Angle on Mechanical Behavior of Simply Supported Continuous Skew T-girder Bridge

为研究斜交角度对简支转连续斜T梁桥受力特性的影响,采用有限元软件Midas/Civil建立斜T梁桥三维数值模型,分别探讨在恒载和移动荷载作用下,不同斜交角度的斜T梁桥受力变化规律.研究结果表明:1)恒载作用:斜交角度的增大对弯矩的影响较小,扭矩会随之增大,剪力和反力会先增大后减小;2)移动荷载作用:当斜交角度小于30°时,弯矩、扭矩、剪力和反力变化幅度均较小;而斜交角度大于30°时,弯矩、剪力和反力均开始急剧减小,扭矩开始急剧增大.研究结果可为简支转连续斜T梁桥的设计提供理论参考.

In order to study the effect of skew angle on the mechanical characteristics of simply supported continuous skew T-girder bridge,a three-dimensional numerical model of skew T-girder bridge is established by using finite element software MIDAS/CIVIL,and the stress variation law of skew T-girder bridge with different skew angles under dead load and moving load is discussed respectively.The results show that:1)dead load effect:the increase of oblique angle has little effect on the bending moment,the torque will increase,the shear force and reaction force will increase first and then decrease;2)Moving load:when the oblique angle is less than 30 degrees,the change range of bending moment,torque,shear force and reaction force is small;when the oblique angle is greater than 30 degrees,the bending moment,shear force and reaction force begin to decrease sharply,and the torque begins to increase sharply.The research results can provide a theoretical reference for the design of simply supported continuous skew T girder bridge.