A three dimensional finite element of nonlinear pushover analysis for short\nspan Reinforced Concrete (RC) bridge with circular piers cross section is\nmodeling to present effects of soil structural interaction (SSI). Structural elements\nmodels are including linear foundation springs modeling, and nonlinear\nRC piers modeling. The paper succeeded to present the SSI effects of\nnonlinear pushover analysis of short spans RC bridges to determine the significant\neffects on dynamic characteristics and displacement capacity of short\nspan RC bridges performance; that is increasing within range 11% to 20%\ncompared to baseline pushover analysis of bridge without SSI effects. Results\nshow the bridge stiffness decreases due to SSI effects on the bridge support for\nmore flexible soils types that generates large displacement, with corresponding\nless base shear in bridge piers and footings by average percentage 12% and\n18%, which is important for structural evaluation for new bridge construction\nand also, for strengthening and repair works evaluation of existing bridges.
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