Behavior of reinforced concrete slab strengthened with fiber reinforced polymer (FRP) laminates

Abstract

The reinforced concrete (RC) slab strengthened with FRP sheets has been popular. The lack of design standards is a significant barrier for the extensive use of FRP for RC in Vietnam. The behavior of the structure depends on many factors. It is difficult to control the failure state of the structure after strengthening, especially brittle failure state due to destruction of the adhesive layer or removal of the protective concrete layer. It is necessary to study the behavior of reinforced concrete slab structure after being strengthened both theoretically and experimentally. In this paper, the results of numerical model analysis clarify the behavior of reinforced concrete slab with FRP slabs based on the analysis of stress, deformation and displacement of the slab. In detail, as increasing the thickness of the FRP sheets, the bending stress, deformation and displacement of the reinforced concrete floor decreased, the reduction of the bending stress from 46.70% to 74.78%, deformation from 45.59% to 73 ,56% and displacement from 14.32% to 27.1%, respectively. As increasing the load level of the slabs,the bending stress, deformation and displacement of the reinforced concrete floor increased, the the increase of the bending stress from13.36% to 58.27%; deformation from 14.47% to 57.89% and displacement from 11.93% to 47.70%, respectively.

Key words: Strengthening, FRP; reinforced concrete slab; mechanical behavior.