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Development of expression of dynamic impact coefficient of skew composite concrete steel plate on beam bridge

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Document pages: 9 pages

Abstract: In order to consider the dynamic influence of moving vehicles, the bridge is designed to carry a static load, which is increased by the dynamic impact (IFS) factor (or dynamic amplification factor), which is a function of the bridge span or the first bending natural frequency. However, this method tends to produce very conservative design, because IFS is calculated based on relatively few general parameters and ignores many important bridge and truck dynamic characteristics. This paper presents a method to determine the more real dynamic influence coefficient of skew composite slab on beam bridge under AASHTO LRFD truck load. Extensive parametric studies were conducted on more than 125 bridge prototypes, and the key parameters were examined, namely, the number of girders, the number of lanes, skew and skewe, and span length. Based on the data generated by this analysis, appropriate expressions for dynamic impact factors for the longitudinal moment and deflection are proposed. In order to reduce the complexity of proposed expressions, the effects of road surface roughness on dynamic responses of bridge-vehicle interaction are considered in bridge modeling. The findings of this study are expected to help bridge engineers to design composite slab-on-girder bridges more reliably and economically and can also be used to reassess the safe live-load capacity of existing structures, potentially preventing the unnecessary posting or closing of busy highway bridges.

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