不同圆心角对小半径曲线桥受力性能影响的研究

Study on Influence of Central Angle on Stress Performance of Small-radius Curved Bridge

为了验证不同圆心角对小半径曲线桥受力性能的影响,采用桥梁博士3.0有限元分析软件,通过建立5种不同圆心角的有限元模型来研究在汽车荷载和恒载作用下,圆心角对曲率半径r=75 m的小半径曲线桥纵向弯矩、扭矩和竖向剪力的影响。研究表明:当圆心角φ小于30°时,可以忽略弯扭耦合作用对小半径曲线桥纵向弯扭、扭矩和竖向剪力的影响,此时的小半径曲线桥可近似按照直线桥来计算。

In order to validate the influence of setting up the central angle on the stress performance of small-radius curved bridge,the bridge doctor 3.0 finite element analysis software is used.The influence of central angle on the longitudinal bending moment,torque and vertical shear of small-radius curved bridge with curvature radius r = 75m is studied by the establishment of five different central angle finite element models under the vehicle load and constant load.The study shows that the influence of bending-torsion coupling on longitudinal bending moment,torque and vertical shear of small-radius curved bridge can be neglected when the central angle is less than.The small-radius curved bridge can be calculated similarly in accordance with the straight bridge right now.