FLEXURAL STRENGTHENING OF REINFORCED CONCRETE BEAM WITH CFRP Mardiana Oesman(a), Antonius Siswanto(a), Aridi Wijaya Pradana(a)
a) Civil Engineering Department, Bandung State Polytechnic
Jl. Gegerkalong Hilir, Ciwaruga, Kec. Parongpong, Kabupaten Bandung Barat, Jawa Barat 40559, Indonesia.
Abstract
The behavior of plain reinforced concrete beam and reinforced concrete beams strengthened with externally bonded CFRP sheet were investigated experimentally. The study is to investigate the influence of CFRP sheet number on the mechanical behavior of concrete beam under flexural loading test. The test was conducted using four beams to investigate with different CFRP sheet layer number. The three CFRP strengthened concrete beams with same thickness and length but different layer number of CFRP sheet. Before reinforced concrete beams strengthened with externally bonded CFRP sheet, the beam have tested up to the occurrence of the steel yield; then the beams were repaired by patching the cracks. The results indicate that, the reinforced concrete beams strengthened with externally bonded CFRP sheet were increased loading capacity, but decreased deflection. The beam strengthened with 2 layers of CFRP reached the maximum loading capacity, but in the minimum deflection. Moreover, the interfacial debonding easily propagates along the interfacial concrete layer at a load that was below the estimated maximum strength of the CFRP-strengthened structure. The maximum strength of the CFRP sheet in the experiment was not achieved due to the adhesive layer between the concrete and CFRP sheet was not strong enough.
