有限元法计算简支T梁桥主梁横向分布系数

Calculation of Transverse Distribution Coefficient of Simply Supported T-bridge by Finite Element Method

以简支T梁桥为例,采用有限元软件Midas Civil建立该桥有限元模型,分别提取各主梁不同截面的挠度、弯矩、支反力,绘制各主梁截面横向分布影响线;将汽车荷载作用于横向分布影响线最不利位置计算主梁横向分布系数,并与传统方法计算的主梁横向分布系数结果进行对比分析。分析结果表明,有限元法可准确计算桥梁横向分布系数,计算不同截面横向分布系数时需选择合理的主梁效应。

Taking the simply supported T-girder bridge as example,the finite element model of Midas Civil is used to establish the finite element model of the bridge,and the deflection,bending moment and supporting force of different sections of each main beam are extracted respectively,and the horizontal distribution influence line of each main beam section is drawn.The transverse load coefficient of the main beam is calculated by applying the vehicle load to the most unfavorable position of the transverse distribution influence line,and compared with the results of the transverse distribution coefficient of the main beam calculated by the traditional method.The analysis results show that the finite element method can accurately calculate the transverse distribution coefficient of bridges,and the reasonable main beam effect should be selected when calculating the transverse distribution coefficients of different sections.