STUDY ON BEHAVIOUR OF PRESTRESSED CONCRETE BRIDGE WITH & WITHOUT SOIL INTERACTION

Objectives: To identify whether the type of soil affects the design parameter of the PSC Bridge and to study the tendency of bending moment, shear force and deflections for pile and pier center at various loads. Methods/Analysis: In this paper pre stressed concrete bridge is analyzed using STAAD-Beava by considering pile foundation at center and at ends abutment is taken as fixed. Here, two models are compared one with soil interaction and the other without soil interaction. Live load, dead load, Moving loads are applied. Moving loads are provided with 3 loading cases i.e. class-A, 70R tracked, 70R wheeled loadings. Findings: Soil structure interaction is an incorporative study which includes the geotechnical and structural engineering. Change in soil property around the piles and below the abutment does not affect the performance of the super structure. Structure design, Foundation designs are calculated without considering soil stiffness. In design, by neglecting interaction effects between soil and bridge may results whether it is unsafe or costly. The massive uncertainty while designing the PSC bridges is at pile foundation due to the reaction of soil. The reaction of lateral soil is nonlinear.Bridge and the supporting soils are examined as one compatible unit in soil interaction. For the above reason, soil properties are taken into account in analysis & design of the soil structure system in order to assure reliable and economical design. Improvements: Effects of soil on abutment for 3 loading cases which are supported by shallow foundation instead of the fixed end.