Finite Element Modelling of RC Slab Strengthened with GFRP

Abstract

Reinforced Cement Concrete (RCC) is adopted in construction of framed structures since years. Due to its durability as compared to any other material, the use of RCC is given prime preference. Structure constructed from RCC work efficiently under normal circumstances, however during earthquakes and when subjected to revised loading conditions, the structure may undergo major damage. Certain damages are difficult to be fixed, and difficulty is mainly due to number of restrictions that an already constructed building imposes. Difficulties such as non-engineered construction, improper execution, wear & tear etc. Dismantling the structure is not a feasible solution, however strengthening the deficient structural components of the structure seems to be a better alternative. Popularity of Fiber Reinforced Polymer (FRP) laminates as a strengthening material for Reinforced Concrete (RC) components in strengthening of beams and columns has led to its wide spread utilization. However, its use in retrofitting of slabs has been limited due to the problem of de-lamination of FRP laminates from the slab surface. This is mainly due to the insufficient development length at its ends. The current paper aims at analyzing retrofitted slabs using ANSYS software. In this work total three slabs were analyzed in ANSYS software. The first slab (Slab-A) of size 1500 x 900 x 50mm was non-strengthened slab having 4 mm diameter mild steel bar at 150 mm c/c spacing both ways. The second slab (Slab-B) was strengthened with GFRP sheet cut near the supports. And the third slab (Slab-C), strengthened with GFRP sheet at the entire soffit of the slab with same size and same detailing of first slab. All three slabs were analyzed in ANSYS software and results compared with those obtained with experimental work carried out by researchers in the past.