Parametric Study of Cable-Stayed Bridges Response Due to Traffic-Induced Vibration

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by Magdi A. Khalifa, Univ of Nebraska-Lincoln, Lincoln, United States,

Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation

Abstract: The dynamic response of long-span cable-stayed bridges due to moving traffic loads is investigated utilizing three-dimensional models. Modal analysis is conducted using the deformed dead-load tangent stiffness matrix. A new concept, presented by discretization of cable into several elements in the finite element modeling, is used to study the effect of cable vibration on bridge dynamics. A computer algorithm is developed to simulate the applied traffic loads in both directions of the bridge deck. The algorithm is flexible in terms of handling different loading capacities, speeds and configurations. Parametric studies are conducted to investigate the effect of cable vibration, damping, vehicle-structure interaction, random roughness of the bridge deck, as well as span length and vehicle-speed. Cases of asymmetric traffic loading clustered in one direction are also considered in order to study the torsional response of the bridge. Results are discussed and summarized.

Subject Headings: Cables | Cable stayed bridges | Traffic models | Vibration | Finite element method | Model analysis | Bridge decks | Dead loads |

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