Analysis of Seismic Response of the Arch Bridge across Reservoir considering Fluid-Solid Coupling Effect

Most of the deep-water bridges in Chinese reservoirs are concentrated on rivers southwest region. The unique structural characteristics arch more line with geological topography requirements deep reservoir areas, making them bridge type choice for areas. While region is an earthquake-prone area, order to study safety across water it necessary analyze effect under seismic behavior box section ring and explore inundation depth dynamic response area. In this study, fluid-solid coupling considered, modified Morison equation used calculate hydrodynamic pressure, analyzed based Midas/civil finite element model Yunnan results show that greatly influenced by submergence due effect, influence pressure longitudinal moment (My) transverse (Mz) increases increase depth. There a threshold value When less than threshold, negligible, when greater significant. thresholds different parts main different. most unfavorable not necessarily completely submerged. Based result, high intensity recommended crossing should be h/f or equal 5/8 f.