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以瓯江大桥引桥预应力混凝土连续箱梁为背景,采用数值计算方法,通过分析自重、预应力、汽车及其组合作用下的剪力滞效应问题,同时与现行规范中翼缘有效宽度法的计算结果进行比较,来研究该种桥型箱梁剪力滞系数的分布规律,并指导该桥设计。结果表明,箱梁断面在单项荷载作用下的剪切变形从梁肋向两侧逐渐减小,且轴向力作用能减弱剪力滞效应;采用翼缘有效宽度法计算结果能反映箱梁的总体受力情况,满足工程的精度要求,但局部位置需作适当加强。
Based on the background of the prestressed concrete continuous box girder of Oujiang Bridge, the numerical method is adopted to analyze the shear lag effect under the self weight, prestress, the automobile and their combination. At the same time, with the effective width method The results are compared to study the distribution of shear lag coefficient of the box girder, and guide the design of the bridge. The results show that the shear deformation of box girder under single load decreases gradually from the rib to both sides, and the effect of axial force can reduce the shear lag effect. The effective width method of flange can reflect the deformation of box girder The overall force situation, to meet the accuracy requirements of the project, but the local location needs to be properly strengthened.