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Title |
Investigation of Impact Factor Variation of Open-Spandrel Arch Bridges According to Spacing Ratio of Vertical Members
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Authors |
홍상현(Sanghyun Hong) ; 오종원(Jongwon Oh) ; 노화성(Hwasung Roh) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.5.45 |
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Keywords |
개복식 상로 아치교; 충격계수; 수직재 간격비; 응답변수 Open-spandrel arch bridges; Impact factor; Spacing ratio of vertical members; Response parameters |
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Abstract |
An open-spandrel arch bridges, which consists of slab deck, arch rib, and vertical members, shows a various level of moment and axial forces according to the supporting boundary condition of arch rib and vehicle speeds. Also, the definition of impact factor accepts any kind of response parameters, not only displacement response at slab deck. The present study considers concrete open-spandrel arch bridges constrained with fixed conditions at the ends of arch rib and investigates the impact factor variation due to moving load speeds, response parameters, measuring locations, and vertical member spacing ratio of the bridges. The results of Reference model show that the impact factor is biggest when the reactive moment resulted at the vehicle-inducing opposite end of the arch rib is applied. The peak impact factor is a similar level obtained for the middle of the span adjacent to the slab deck center, but it is 19% higher than the peak impact factor calculated using the axial force developed at the same location. Reducing the spacing ratio of the vertical members as half as the reference model whose ratio is 1/9.375 produces a similar level of the moment-based peak impact factor compared to the reference model. However, when the spacing ratio is doubled, the peak impact factor is 4.4 times greater than the reference model.
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