Analytical Study on Shear Response of Hollow Core Slab Subjected to Elevated Temperature using Extended Finite Element Method

Abstract

Prestressed hollow core slabs are members without transverse reinforcement and are often exposed to shear failure, especially in elevated temperatures. The study of shear response in the precast pre-stressed hollow core slab is essential to study the tension-compression damage of the flexural member. The hollow core slab is subjected to typical shear failure loading conditions and the loading condition is simulated through the finite element model in ABAQUS. The 3D model depicting the actual shear behaviour of the hollow core slab is developed with the simple concrete damage plasticity model. Extended Finite Element Method (XFEM) analysis is used to study the propagation of cracks, from which displacement and cracking patterns are obtained for the slab with the varying depth of 200 mm, 250 mm, and 300 mm. Effect of varying depth on the shear behaviour of hollow core slab under elevated temperature are determined and the results obtained from the finite element analysis are validated for the accuracy with the ACI equation for shear behaviour and it is observed that there is good agreement in the ultimate load values obtained. The real-time behaviour of the hollow core slab under the combined effect of shear and elevated temperature is depicted with the help of crack propagation analysis. Further, the developed finite element model can be used for crack propagation study of hollow core slabs under shear failure.