Abstract
The effects of seawater and site conditions on the seismic response of the isolated continuous girder bridge are evaluated in this study. The seawater-muddy soil-isolated bridge coupling model is built in the dynamic analysis software ADINA, and the external seismic wave input is realized by the seismic wave motion analysis program. The influences of seawater and muddy soil on the seismic response of isolated continuous girder bridges are determined by comparing different offshore site models. The results indicated that the seawater and the muddy soil magnify the displacement of the seabed. The existence of seawater increases the longitudinal relative displacement of piers by 20%–40% but has limited influence on the bending moment and shear force of piers. The muddy soil can increase the longitudinal relative displacement and internal force of the piers remarkably. Moreover, the displacement of bridge bearings increases significantly under the combined influence of muddy soil and seawater. In the seawater-muddy soil-isolated bridge coupling model, the seawater and site condition can influence the seismic performance of sea-crossing bridges obviously.
Highlights
IntroductionThe construction of the sea-crossing bridge is in the ascendant. Compared with the onshore bridge, the service environment of the sea-crossing bridge is more complicated
In recent years, the construction of the sea-crossing bridge is in the ascendant
Li [7] proposed a method of dynamic response analysis for bridges in deep water under combined actions of earthquake and wave using the linear radiation wave theory and diffraction wave theory. e results indicated the bridge response in deep-water models under separate earthquake and wave actions is nonlinear and cannot be combined by superposition. is conclusion has been verified by literature [8]
Summary
The construction of the sea-crossing bridge is in the ascendant. Compared with the onshore bridge, the service environment of the sea-crossing bridge is more complicated. By comparing and analyzing the seismic responses of the surface (or seafloor) and the key parts of the isolated continuous girder bridge under three earthquakes, the effects of seawater and muddy soil on the offshore ground motion and the seismic performance of the bridge structure are determined.
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