Abstract
In violent earthquakes, ground motion is considered to change dramatically in the process of spatial propagation. Strong spatially varying exists in ground motion near fault area, and it can cause the large-span and large stiffness structure to be damaged. In this paper, a typical long-span steel box arch bridge is selected as an engineering case. In order to simulate the spatial variation of near fault ground motion accurately, the records that sampled in former earthquake are used as ground motion input. The shaking table experiment and finite element analysis are used as analysis means. Through the analysis of the internal force and displacement response of the key position of the arch rib, it is found that the spatially varying in the near fault ground motion can bring severe seismic response. If the spatially varying is ignored, the damage of the bridge will be seriously underestimated.
Highlights
Near fault ground motions are believed to contain large amounts of energy and have strong spatially varying characteristics.(Ellsworth et al 2013; Fang, Cheng, et al 2018;Abdollahzadeh, G., et al.2018)
Through the analysis of the internal force and displacement response of the key position of the arch rib, it is found that the spatially varying in the near fault ground motion can bring severe seismic response .If the spatially varying is ignored, the damage of the bridge will be seriously underestimated
Some lifeline traffic are difficult to completely avoid faults due to the factors of construction site and route selection, which makes some long-span steel box arch bridges inevitably affected by faults (Goel and Anil 2008;Goel, Rakesh, et al 2014).The steel box arch bridges with large span are more vulnerable to the permanent displacement of the fault area
Summary
Near fault ground motions are believed to contain large amounts of energy and have strong spatially varying characteristics.(Ellsworth et al 2013; Fang, Cheng, et al 2018;Abdollahzadeh, G., et al.2018). Due to the huge damage of strong spatially varying near fault ground motion and the sensitivity of steel box arch bridge to this kind of earthquake, once it occurs, the bridge will be seriously damaged. For the Rokko island Bridge with a main span of 217 meters, the steel bearing falls off and the wind brace yields(Wilson 2003) From these earthquake damage cases, it can be found that once strong earthquake occurs in the near fault area, the steel box arch bridge within the region will be seriously damaged. This simplification is effective for the far-field ground motion with gentle change, but for the near-field ground motion with severe change the seismic impact is obviously underestimated For this reason, many methods have been used to study the damage of long-span and large stiffness structures due to the strong spatially varying in the near fault area. The intensity of the spatially varying of the real near fault area is revealed, and the damage of the spatially varying to the long-span steel box arch bridge is analyzed
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