魏建东, 刘忠玉. 悬索桥结构分析中索鞍的精确模拟[J]. 工程力学, 2006, 23(7): 114-118.
引用本文: 魏建东, 刘忠玉. 悬索桥结构分析中索鞍的精确模拟[J]. 工程力学, 2006, 23(7): 114-118.
WEI Jian-dong, LIU Zhong-yu. A SADDLE MODEL IN FINITE ELEMENT ANALYSIS OF SUSPENSION BRIDGES[J]. Engineering Mechanics, 2006, 23(7): 114-118.
Citation: WEI Jian-dong, LIU Zhong-yu. A SADDLE MODEL IN FINITE ELEMENT ANALYSIS OF SUSPENSION BRIDGES[J]. Engineering Mechanics, 2006, 23(7): 114-118.

悬索桥结构分析中索鞍的精确模拟

A SADDLE MODEL IN FINITE ELEMENT ANALYSIS OF SUSPENSION BRIDGES

  • 摘要: 为在悬索桥结构分析中精确模拟索鞍,建立了索段一端固定于鞍座上的两节点“左鞍座单元”和“右鞍座单元”,以及索段中一点固定于鞍座上的三节点“鞍座单元”,此固定点为新单元的一个节点。它们通过自动调整索与鞍座的切点而处于平衡状态,从而简化了计算。单元算法的推导基于有限元分析的基本原理和弹性悬链线的精确解,并利用了处于平衡状态时索与鞍座之间的内力关系。新单元可以考虑鞍座重量的影响,鞍槽纵向曲线可为复合圆曲线。新单元可以同常规单元一样直接用于索结构的有限元分析,设计的算例验证了其正确性,工程算例显示了其在悬索桥结构分析中的应用。

     

    Abstract: To model saddles in finite element analysis of suspension bridges,one class of new finite elements were developed,including two-node left-saddle element and right-saddle element that model a cable segment fixed with saddle at one end respectively,and three-node saddle element that models a cable segment fixed with saddle at one point on the cable.The fixed point was selected to be one node in each element.The proposed elements simplify computations by automatically adjusting the departing points.The derivation of element formula is based on the principles of FEM and the analytical solutions of elastic catenary.The relation of the forces between cable and saddle at equilibrium are also used.The saddle weight can be considered in the proposed elements,and the longitudinal curve of saddle can consist of two arcs with different radii.The proposed elements can be incorporated into conventional finite element analysis.Examples demonstrate the accuracies and applications of the proposed elements.

     

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