|
Abstract The coupling numerical method，8-node three-dimensional isoparametric element with infinite element，was applied to the seismic response analysis of soil and bridge pile foundation. Based on the software of ABAQUS，the study sets up the corresponding calculation method and the great elastoplastic model of three- dimensional nonlinear time-history seismic dynamic response analysis concerning pile cap-pile group-soil system. The concrete damaged plasticity model was used for pile cap and pile，and the elastoplastic model of traditional Mohr-Coulomb yield criterion for soil. The unfavorable factors，which influence the bearing capacity of pile foundation，are taken into account，such as the natural self-weight of pile cap and large-diameter super-long bored pile，and the seismic liquefaction of saturated loose sand layer of shallow-buried river-bed around the bridge-pile construction site. The study puts forward the conception of unified static and dynamic viscoelastic infinite boundary. Under the static and horizontal vibration loads applied to pile cap-pile group-soil system at the same time，what have been obtained by 4 CPUS¢ parallel calculation are the dynamic axial force，shear force and moment of pile group，the side friction and the contact pressure between pile shaft and the soil around pile，and so on. These are valuable results for the design and calculation. Furthermore，the calculation results give out an overall and deep understanding about the aseismic performance of bridge pile foundation.
|
|
Received: 13 November 2008
|
|
|
|
