Pile-soil-bridge Dynamic Interaction Effect On Bridge Seismic Response

This paper uses the finite element software ANSYS calculated the level and verticaldynamic impedance functions of single and group pile. The main work and conclusionsinclude as follows:1. This paper summarizes the method of impedance function, and use the method tocalculate the horizontal, vertical rotational impedance of single pile in the test ofH.El-Marsafawi et al.2. Using the finite element software ANSYS to establish the finite element modeland to analysis the dynamic pile test of H.El-Marsafawi. Considering viscoelasticartificial boundary single pile and pile group self vibration characteristics were obtainedon the basis of DP soil constitutive model. the harmonic response were obtained indifferent frequency by harmonic response analysis.3. According to the definition of impedance function, using ANSYS to calculate theimpedance function of single pile. Comparing the simulation results with the ThinLayered method of simplified calculation results, we found that the ANSYS calculationresults were consistent with the simplified method and the method was feasible byANSYS calculation of foundation impedance which laid foundation for analysis ofupper structure considering impedance of vibration response.4. Summarized the calculation method of pile-soil-structure interaction and thenusing the method of substructure analyzed the dynamic response of upper part of thestructure. By the finite element software ANSYS to establish the structure model, andthen analyzed natural frequency, displacement response curves and seismic response ofupper structure. Comparing with the results that without considering the interactionbetween pile and soil, we found that the dynamic characteristics very different:(1)considering the dynamic impedance of foundation, the natural frequency of the structurewas obviously reduced, the average of first natural frequencies decrease of24%.(2) Thetop displacements of structure under earthquake increased obviously.(3) Theacceleration response of superstructure enlarged1.25times (4) Displacements of theharmonic response produces bigger changes.