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曲线矮塔斜拉桥主梁不仅受轴向压力和剪力,还要承担相当部分的弯矩和扭矩,所以其空间应力的不均匀现象非常严重,并且随着箱梁宽度的增大剪力滞效应就更加严重。本文以龙井河大桥为研究背景,采用空间有限元软件,通过建立全桥的空间有限元模型,研究了曲线矮塔斜拉桥在预应力、索力以及自重荷载作用下施工阶段主梁的受力特性和剪力滞效应。得出了曲线矮塔斜拉桥在施工阶段主梁剪力滞效应的基本规律。
The main beam of curved low profile cable-stayed bridge not only receives axial pressure and shear force, but also takes a considerable part of the bending moment and torque, so the unevenness of its spatial stress is very serious. With the increase of box beam width, Hysteresis effect is even more serious. In this paper, Longjing River Bridge is taken as the research background. By using the finite element software and the finite element model of the full bridge, a finite element model of the full bridge is established. The influence of the prestressed, the cable force and the self-weight load on the girder Force characteristics and shear lag effect. The basic law of shear lag effect of girder with curved short cables in the construction stage is obtained.