| Abstrakt: |
A parametric study on threespan cablestayed bridges with a radiating system of cables is presented. It is intended to investigate the effect of the stiffnessses of cables, pylons, and girders, as well as the effect of the central unsupported length of the main span, on the behavior of the various elements of the bridge superstructure. The study provides a better understanding of the bridge performance involving the cable forces, the girder and pylon displacements, as well as the pylon moments and axial forces due to live load. This contributes to the design of a real bridge, a laboratory model, or even a numerical example. It is shown that there is an optimum value for the central unsupported length of the main span, depending on the number of stay cables in the main span. The study shows also that the reduction in the bending stiffness of the girder results in excessive girder and pylon deflections, as well as large internal forces in the pylons and cables. |
