EFFECT OF DRILLING GEOMETRY ON THE BEHAVIOUR OF RC BEAMS STRENGTHENED WITH CFRP LAMINATES

doi:10.21608/asge.2020.271116

EFFECT OF DRILLING GEOMETRY ON THE BEHAVIOUR OF RC BEAMS STRENGTHENED WITH CFRP LAMINATES

Document Type : Original Article

10.21608/asge.2020.271116

Abstract

Recently, strengthening of reinforced concrete (RC) beams subjected to bending moments and shear forces is receiving increased and continuous attention. The bending and shear stresses are considered the main factors affecting on the strength of (RC) beams. Cracks around the opening in the beams occurs because of the stress concentrations generated ahead of openings, that leads to reduce the beam load capacity and stiffness and increase the deflection and crack widths of the beam. In this work, a numerical program was designed to investigate the behavior of RC beams drilled with opening and strengthened with carbon fiber reinforced polymer (CFRP) sheets. The well-known finite element program named ANSYS with version 19 was used. The parameters which have been studied include the relative dimensions of the opening with respect to the dimensions of the beam. A 3-D finite element analysis with a steady state loading conditions has been considered to model and idealize the problem. The results in the present work proved that using the suggested shape of strengthening for drilled RC beams improved its load bearing capacity, deflection and the modes of failure of the beams. It was also found that the height of the opening is more effective than its length in reducing the load bearing capacity of the beam.

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