Application of Influence Lines on Static Analysis of Cable-Stayed Bridges

Abstract

Abstract-Cable stayed bridges are one of the most advanced bridges ever built. This type of bridges geometrically is similar to suspension bridges, but their structural behaviors are so different. In the last decade for bridges with span length (500-1000 m), the cable stayed bridges have been more welcomed. In comparison with suspension bridges, the cable stayed bridges have advantages like the simple construction of foundations. In this paper, for a specific cable stayed bridge three different connection systems including radial, harp and fan are designed and modeled by finite-element software (ANSYS). Based on the results of static analysis of bridges, the elements which have the maximum internal forces are chosen. The influence lines of shear force, axial force of cables and bending moments of selected elements are drawn for three bridge types. The results indicate that, for bridges subjected to high concentrated loads, bridges with radial and fan cables have better structural performance and for bridges subjected to high distributed loads, bridges with harp cables have better performance than the others.Index Terms-Cable-stayed bridge, influence line, ANSYS

Bridge influence line identification from structural dynamic responses induced by a high‐speed vehicle

“…How to accurately identify the bridge influence line from direct measurement data becomes an important issue in B‐WIM system . As a static property of the bridge, bridge influence line also contains bridge information, which can be used for model correction and bridge evaluation . If bridge influence line can be extracted from dynamic responses, the field test of the bridge influence line can be done in a more efficient way.…”