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为研究运营阶段不同荷载组合对斜拉桥主塔变形及内力的影响,以国外某新建双塔混凝土斜拉桥工程为依托,采用MIDAS/Civil建立了斜拉桥有限元模型,对斜拉桥在运营阶段的内力及变形进行计算分析。计算得出了不同荷载组合下的斜拉桥主塔塔顶偏移及最大应力。结果表明:不同荷载组合下斜拉桥主塔变形存在较大差异,斜拉桥主塔塔顶的偏移量在LM1+人群荷载下最小,在LM4+人群荷载组合下达到最大,位移偏向跨中方向;不同荷载组合下斜拉桥主塔内力差异较小,主塔最大应力在LM1+人群荷载下最小,在LM4+人群荷载组合下达到最大,最大应力所在部位为第一个横梁与塔交界处。
In order to study the influence of different load combinations on the deformation and internal force of main tower of cable-stayed bridge during operation, a finite element model of cable-stayed bridge was established by MIDAS / Civil based on a new double-stayed concrete cable stayed bridge project abroad. In the operation phase of the internal forces and deformation calculation and analysis. The tower top displacement and maximum stress of the cable-stayed bridge under different load combinations are calculated. The results show that the deformation of the main tower of cable-stayed bridge under different load combinations is quite different. The displacement of the main tower of cable-stayed bridge is the smallest under the load of LM1 + population and reaches the maximum under the load combination of LM4 + people. The difference of the internal force of the main tower of the cable-stayed bridge under different load combinations is small. The maximum stress of the main tower is the smallest under the load of LM1 + population and reaches the maximum under the load combination of LM4 + population. The site where the maximum stress is located is the junction of the first beam and the tower.