Proceedings of the KSR Conference (한국철도학회:학술대회논문집)
- 2005.11a
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- Pages.211-216
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- 2005
Experimental Evaluation of Modal Properties for Estimation of the Railway Bridge Dynamic Performance
철도교량 동적성능 평가를 위한 동특성 추출 실험연구
- Published : 2005.11.01
Abstract
Resonance of railroad bridge can be broken out when natural frequency of the bridge coincides with exciting frequency of moving forces. In order to avoid aforementioned unpleasant response of the structure, exact determination of dynamic structural properties is important to understand dynamic behavior of the structure under moving train loads. In the present paper, a 25 meters long full scale IPC girder and 15m Precom girder models were fabricated as a test specimen and modal testing was carried out to evaluate modal parameters including natural frequencies and modal damping ratios. In the modal testing, a digitally controlled vibration exciter as well as an impact hammer is applied to obtain frequency response functions more exactly and the modal parameters are evaluated varying with structural status.
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