Abstract
The article determines natural frequencies of vibration and the corresponding mode shapes of a suspension bridge with the varying bending stiffness of cables and examines variations that occur in these characteristics with respect to parametric changes in the bridge. A single span suspension steel footbridge with flexible cables has been selected as an initial model used for studying the dynamic characteristics of a suspension system. With the help of the finite elements (FE) method, parameter studies of the bridge model are presented in which vibration characteristics are studied as a function of structural and material parameters such as the flexural stiffness of the cable and the mass density of structural components. It has been generally found that the bending stiffness of the main cable contributes to a considerable effect on natural frequencies for this type of the suspension system. A simplified expression of predicting natural bending frequencies of the suspension bridge taking into account the bending stiffness of the cable has been developed for the application as the first step in the design process.
Highlights
Cable supported bridges typically of long spans are the most important and attractive structures possessing a number of technical, economical and aesthetic advantages
The main objective of this study is to investigate the influence of the bending stiffness of the main cables on the free vibration response of suspension bridges
The effect of the bending stiffness of the main cable on free vibration characteristics of the suspension bridge has been analysed as an example of the project on the footbridge designed as a suspension steel structure
Summary
Cable supported bridges typically of long spans are the most important and attractive structures possessing a number of technical, economical and aesthetic advantages. According to the authors, investigation into the dynamic global response of the suspension bridges with account for the effect of the bending stiffness of the cables has not been carried out. Many researchers have investigated the dynamic characteristics of cable supported bridges, including the effect of the bending stiffness of the cable and considering the cables isolated from the bridge structure As regards very long span suspension bridges having large diameter wire cables, the effect of their bending stiffness should be taken into account for an accurate evaluation of the modal properties of freely supported cables A simple analytic method for predicting bending natural frequencies of the suspension bridge taking into account the bending stiffness of the cable has been proposed
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