Effect of Anchorage Number on Behavior of Reinforced Concrete Beams Strengthened with Glass Fiber Plates

Abstract

Reinforced concrete beams with insufficient shear reinforcement were strengthened using glass fiber reinforced polymer (GFRP) plates. In the study, the effect of the number of bolts on the load capacity, energy dissipation, and stiffness of reinforced concrete beams were investigated by using anchor bolt of different numbers. Three strengthened with GFRP specimens, one flexural reference specimen designed in accordance to Regulation on Buildings Constructed in Disaster Areas rules, and one shear reinforcement insufficient reference specimen was tested. Anchorage was made on the surfaces of the beams in strengthened specimens using 2, 3 and 4 bolts respectively. All beams were tested under monotonic loads. Results obtained from the tests of strengthened concrete beams were compared with the result of good flexural reference specimen. The beam in which 4 bolts were used in adhering GFRP plates on beam surfaces carried approximately equal loads with the beam named as a flexural reference. The amount of energy dissipated by strengthened DE5 specimen was 96 % of the amount of energy dissipated by DE1 reference specimen. Strengthened DE5 specimen initial stiffness equal to DE1 reference specimen initial stiffness, but strengthened DE5 specimen yield stiffness about 4 % lower than DE1 reference specimen yield stiffness. Also, DE5 specimen exhibited ductile behavior and was fractured due to bending fracture. Upon the increase of the number of anchorages used in a strengthening collapsing manner of test specimens changed and load capacity and ductility thereof increased.

Experimental Study of Aged and Seriously Damaged RC Beams Strengthened Using CFRP Composites

“…U wraps are a type of traditional anchorage scheme that has been studied by many scholars [27,28]. CF anchors originally developed by the Shimizu Corporation in Japan offered a new way to anchor FRP sheets [29].…”

Behaviour of reinforced concrete beam strengthened in shear with geosynthetic

“…The experimental findings showed that the contribution of the shear strength to the RC beams by these composite plates is limited due to the delamination of these plates along with the concrete cover. Kaya and Kankal (2015) studied the effect of anchorage bolt in shear-deficient RC beams strengthened using glass fibre–reinforced polymer (GFRP) plates, and the test result revealed that load-carrying capacity and ductility increases with increasing the number of anchorage bolts. Ramezanpur et al (2018) conducted an experimental test to see the effect of increasing the shear capacity of RC beam by developing the modified near-surface mounted technique using the GFRP bars which increased the shear capacity and ductility of RC beam.…”