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Title |
Investigation of Impact Factor and Response Factor of Simply Supported Bridges due to Eccentric Moving Loads
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Authors |
홍상현(Sanghyun Hong) ; 노화성(Hwasung Roh) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.6.105 |
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Keywords |
단순교 ; 충격계수 ; 응답계수 ; 편측이동하중 ; 충격계수 응답스펙트럼 Simply supported bridges ; Impact factor ; Response factor ; Eccentric moving loads ; Impact factor response spectrum |
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Abstract |
The proposed model to predict the bridge load carrying capacity uses the impact response spectrum. The spectrum is based on Euler-Bernoulli beam and the center of the bridge width for the moving load location. Therefore, it is necessary to investigate the eccentric moving load effects on the impact factor and response factor. For this, this study considers 10 m width and two-lane simply supported slab bridges and performs the moving load analysis to investigate the variations of peak impact factor and corresponding response factor. The numerical results show that the eccentric load increases both the static and dynamic displacements, but the impact factor is decreased since the incremental amount of static displacement is bigger than that of dynamic displacement. However, the difference of the impact factors between the center and eccentric loadings is small showing less than 0.5%p. In the response factor, the eccentric loading increases both the static and dynamic response factors, compared to the center loading. The difference of the response factor is only 0.18%p. It shows that the eccentric loading has very small effects on the response factor, thus the impact factor response spectrum which is generated based on the center moving load can be used to determine the response factor.
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