Nonlinear Finite-Element Analysis of Reinforced Concrete Bridge Approach Slab

Abstract

A bridge approach slab serves as a structural slab between the bridge structure and the approach embankment. The primary causes of approach slab failures are undermining, settlement and cracking. Undermining and settlement of the slab can be treated by either mud jacking or by pumping grout material to fill the voids beneath the slab. Transverse and longitudinal cracking leads to distress of the slab and reduces its life expectancy. The objective of this technical note is to numerically study the extent and location of cracks by performing a nonlinear finite-element analysis of the slab. The factors affecting the cracks such as the thickness of the slab and the contact conditions with the soil underneath have been parametrically studied. This technical note brings out the issues and advantages related to the usage of finite-element analysis for approach slabs. The tension stiffening component, has been calibrated before being used for the approach slab model. A thicker approach slab could be a more viable solution as compared to the expensive soil treatment.