Seismic Response Analysis of the Large Bridge Pier Supported by Group Pile Foundation Considering the Effect of Wave and Current Action

Abstract eng:
On the basis of the ABAQUS software and parallel calculation technology, this paper presents a 3D finite element method to model the pier-piles -soil system. In the analysis model, the soil is represented as an assembly of 8 node solid elements and the viscous-plastic memorial nested the yield surface model of soil was used to describe its dynamic nonlinear. The piles are represented as an assembly of beam elements and the dynamic plastic-damage model was used to describe the concrete’s dynamic character. And based on the Morison’s hydrodynamic pressure formula and representing sea wave by Stokes fifth-order wave theory, the wave force was putted on the bridge pier and group piles as a distributed load. The pile’s seismic response characteristics in lenitic condition and including the influence of the wave and current action were analyzed, and the influence of the wave height and current velocity on the pile’s seismic response was discussed. The results show that the wave and current action increases the pile’s peak response of relative displacement, shear force and moment obviously, but has slight influence on the pile’s peak response of acceleration. The influence of the wave height on the pile’s seismic response is related to the earthquake wave characteristics. The current velocity has an obvious influence on the pile’s response of relative displacement. As the velocity increased, the relative displacement along the river direction increased, but the relative displacement against the river direction decreased. It shows that it is necessary to consider the effect of the wave and current action on the large bridge pier’s seismic response.

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