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以常山矮塔斜拉桥为研究对象,通过有限元程序Midas Civil 2010建立该桥的空间有限元模型,并对大桥进行成桥静、动力特性分析。计算结果表明:在正常使用状态内力组合和承载能力极限状态内力组合作用下主梁和主塔的位移均较小,主梁全部承受压应力,满足规范要求,成桥前期混凝土收缩徐变对主梁位移影响较大,后期收缩徐变趋于稳定。该桥的一阶自振周期为1.230s,在目前中国已建成的矮塔斜拉桥中属于比较典型的一个,由于其横向刚度较大,其低阶振型主要表现为主梁的竖弯和主塔的横弯。
Taking Changshan low profile cable-stayed bridge as the research object, the finite element model of the bridge was established by finite element program Midas Civil 2010, and the static and dynamic characteristics of the bridge were analyzed. The calculated results show that under normal conditions, the displacements of the main girder and the main tower under the combination of the internal forces and the ultimate bearing capacity of the bearing capacity are all small, and the main girders are all under compressive stress and meet the requirements of the code. Beam displacement has a greater impact, post-shrinkage and creep tends to be stable. The first-order natural vibration period of the bridge is 1.230s. It is a typical one of the existing low-rise cable-stayed bridges in China. Due to its large transverse rigidity, the low-order vibration modes mainly show the vertical bending And the main tower of the transverse bend.