Seismic analysis of integral bridge considering the influence of soil structure interaction

Abstract

AbstractIn Simply supported bridge, superstructure and substructure are separated by the expansion joint and bearing. In Integral bridge (IB), the bridge deck is casted monolithically with the abutment wall. Integral bridges have increased redundancy, which improves its seismic performance. Simply supported Bridge fails may fail due to the failure of bearing, non‐availability of seating width and failure of expansion joint which does not occur in the IB. The single pile analysis performed in Csi bridge and L pile software with same soil and pile parameter shows that the soil parameters from API guideline can be used in the FEM to represent the SPI. The FE modelling of a benchmark IB is modelled in Csi Bridge. Soil surrounding the pile is represented by the series of nonlinear spring p–y curve, t‐z curve and q‐z curve based on API. Seismic Capacity of benchmark IB is determined using nonlinear static analysis in which nonlinearity is assigned in soil and pile. The forces induced in piles are observed to be within the elastic capacity. Parametric study with variation of soil (loose sand, medium sand and stiff clay) by Nonlinear static analysis shows stiffness of soil has significant effect on seismic response.