Soil-Structure Interaction Analysis of Bridge Columns Supported on CISS Piles

A pushover analysis on the inelastic response of bridge columns supported on pile groups consisting of full moment connection cast-in-place-steel-shell (CISS) piles is presented in this paper. An original component of the work presented in this paper is that the analytical models considered the nonlinear actions that develop in the column, supporting piles and soil. Analysis confirmed that variations in the horizontal and vertical soil stiffness affect the pile cap lateral deflection and rotation, respectively. Results from this analysis also indicate that for columns with aspect ratios lower than six the contribution of soil-structure interaction is significant; however, for columns with higher aspect ratios and for stiffer soils the effects of soil-structure interaction are negligible.