分体式钢箱梁斜拉桥的偏载系数研究

Research on eccentric-loaded coefficients of separated steel box girder cable-stayed bridge

文章以芜湖长江公路二桥为工程背景,建立空间有限元模型,计算中跨跨中截面荷载横向分布系数及偏载系数。同时根据分体式钢箱梁的特点选择简化的计算方法:偏心压力法和修正偏压法。将计算结果进行对比分析,结果表明,修正偏压法与有限元法的计算结果较吻合,可以作为此类分体式钢箱梁斜拉桥荷载横向分布系数及偏载系数的简化算法。

Taking the Second Wuhu Yangtze River Highway Bridge as engineering background, the spatial finite element model is established, and the load transversal distribution factors and eccentric- loaded coefficients of the mid-span section are calculated. And the simplified methods, such as eccen- tric-compressive method and modified eccentric-compressive method, are proposed based on the char- acteristics of separated steel box girders. The calculated results are compared and analyzed. It is con- cluded that the results of modified eccentric-compressive method are in good agreement with those of finite element method with cable force parameter. Therefore, the modified eccentric-compressive method can be used to calculate the load transversal distribution factors and eccentric-loaded coeffi- cients of separated steel box girder cable-stayed bridge as a simplified method.