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This paper presents a summary of numerical analysis on static behavior of suspension bridges with varying cable rigidity. The main aim was to compare suspension systems with flexible and rigid cables and determine the influence of varying cable rigidity on response of bridge members under action of uniformly distributed symmetrical and unsymmetrical static loading. Finite element analysis of a 3-D bridge model was performed. In the first model, the cable is modeled as TRUSS3D element and in the second model as BEAM3D element. In both models, the hangers and backstays are TRUSS3D elements and stiffening girder as BEAM3D element. It is shown that a suitable increase of main cable’s bending stiffness can effectively reduce displacements, internal forces, and stresses of suspension systems. Recommendations for appropriate stiffness are given.

Finite element modelling for static behaviour analysis of suspension bridges with varying rigidity of main cables