Dynamic-Fatigue Response of Continuous Composite Bridgesby Nabil F. Grace, Univ of Windsor, Windsor, Ont, Canada,
John B. Kennedy, Univ of Windsor, Windsor, Ont, Canada,
Abstract: The dynamic response of continuous composite bridges and the influence of fatigue loading at resonance frequency on the structural response are investigated. It is shown that cracking of the concrete deck as well as fatigue cracks can reduce the natural frequencies of the structure. Furthermore, it is shown that such fatigue loading can cause very rapid increases in the stress range, leading to sudden failure of the structure. The theoretical results, based on the orthotropic plate theory, are verified by tests on a bridge model.
Subject Headings: Composite bridges | Dynamic loads | Fatigue (material) | Continuous bridges | Dynamic response | Cracking | Bridge tests | Dynamic structural analysis
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