大悬臂弧形腹板钢箱梁剪力滞效应和偏载效应分析

大悬臂弧形腹板钢箱梁的空间受力特征非常明显,在采用常规的单梁杆系模型进行箱梁纵向受力分析前,需要正确把握结构的受力特性。以萧山东人城口环境综合整治工程中主线高架的某三跨连续钢箱梁为例,利用ANSYS建立全桥的三维板壳模型,分析了钢箱梁在典型荷载作用下的剪力滞效应和偏载效应,得到了箱梁剪力滞系数沿纵、横桥向的分布规律和关键截面的活载偏载系数,为常规单梁模型的计算方法提供了可靠的简化参数。

Investigation of Shear Lag Effect and Eccentric Load Effect of Larger Cantilever Steel Box Girder with Arc Shape Webs

Larger cantilever steel box girder with shape webs has the special spatial stress characters.The mechanical behaviors should be investigated correctly before the longitudinal mechanics analysis of box girder using single-beam model method.With reference to a three-span continuous steel box girder in the urban viaduct of the environment rehabilitation project in the east-entrance of Xianshan city,this paper studied the shear lag effect and eccentric load effect of larger cantilever steel box girder with arc shape webs under the typical loads,using 3D thin-shell element model.The distribution laws of the shear lag coefficients along the longitudinal and transverse directions and the eccentric load coefficients of the key sections are obtained,which could be the reliable and simple parameters to the single-beam model methods.