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基于Abaqus平台建立了泰州3塔悬索桥三维有限元计算模型,采用Lanczos特征值求解方法分析了该桥的动力特征,研究了加劲梁竖向、横向和扭转刚度以及塔梁间设置弹性约束对大跨度3塔悬索桥动力特性的影响。研究结果表明,加劲梁竖向刚度、横向刚度、扭转刚度的变化均对相应方向上的振动频率有影响,对其他方向上振动频率影响甚小;中塔梁间的弹性拉索刚度仅影响竖向振动频率,当其刚度超过设计刚度后影响甚小;不设置弹性约束时,结构会出现纵飘振型;塔梁间的弹性约束对动力特性的影响大于缆梁间中央扣对动力特性的影响。
Based on the Abaqus platform, a three-dimensional finite element model of the Taizhou 3-tower suspension bridge was established. The dynamic characteristics of the bridge were analyzed by Lanczos eigenvalue method. The vertical, transverse and torsional stiffness of the stiffening girder, 3 tower suspension bridge dynamic characteristics. The results show that the variation of vertical stiffness, transverse stiffness and torsional stiffness of the stiffening girder have an impact on the vibration frequency in the corresponding direction and little influence on the vibration frequency in other directions; the stiffness of the elastic cable between the mid-tower girders affects only the vertical When the stiffness is beyond the design stiffness, the vibration frequency will have little effect on the vibration frequency. When the elastic constraint is not set, the structure will appear the longitudinal vibration mode. The elastic restraint between the girder and the girder will affect the dynamic characteristics more than the central buckle. influences.