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Seismic response of bridge pier on rigid caisson foundation in soil stratum

C. Tsigginos¹, N. Gerolymos², D. Assimaki³ and G. Gazetas²

1. National Technical University of Athens, Greece
2. Civil Engineering, National Technical University of Athens, Greece
3. Civil Engineering, Georgia Institute of Technology, Atlanta, USA
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Abstract: An analytical method to study the seismic response of a bridge pier supported on a rigid caisson foundation embedded in a deep soil stratum underlain by a homogeneous half space is developed. The method reproduces the kinematic and inertial responses, using translational and rotational distributed Winkler springs and dashpots to simulate the soil-caisson interaction. Closed-form solutions are given in the frequency domain for vertical harmonic S-wave excitation. Comparison with results from finite element (FE) analysis and other available solutions demonstrates the reliability of the model. Results from parametric studies are given for the kinematic and inertial responses. The modification of the fundamental period and damping ratio of the bridge due to soil-structure interaction is graphically illustrated.

Keywords: caisson; embedded foundations; kinematic response; inertial response; Winkler model; effective period; effective damping