并列式公铁两用钢桁梁桥荷载横向分布系数研究

Research on load lateral distribution coefficient of parallel-type road-railway steel truss bridge

以某并列式公铁两用钢桁梁桥为研究背景,利用ANSYS软件建立有限元模型,研究其在列车和汽车不均匀荷载下的横向分布系数。计算获得了主梁横向分布系数,并讨论了不同板厚、不同横梁刚度对荷载横向分布的影响。研究表明:两根主梁的列车荷载横向分布系数分别为0.670和0.330,汽车荷载横向分布系数分别为0.466和0.600;板厚的增加使荷载横向分布变得更加均匀,但不同板厚的荷载横向分布计算结果最大相差不足1%;不同横梁刚度的荷载横向分布影响线非常接近,可以忽略此参数对荷载横向分布的影响。

In this paper,a parallel-type highway-railway steel truss bridge was taken as the research background,the finite element model was established by ANSYS to study its lateral distribution coefficient under uneven load of train and vehicle.The calculation obtained lateral distribution coefficient of the girder,and discussed the influence of different plate thickness and different beam stiffness on the load lateral distribution.The results shown that the lateral distribution coefficient of two girders under train load are 0.670 and 0.330 respectively,and the lateral distribution coefficients under vehicle load are 0.466 and 0.600 respectively.The increase of plate thickness makes the lateral distribution coefficient more uniform,but the maximum difference of load lateral distribution calculation results for different plate thicknesses is less than 1%.The influence line of load lateral distribution for different beam stiffness are very close,and the influence of this parameter on load lateral distribution can be ignored.