Rehabilitation of damaged RC exterior beam-column joint using various configurations of CFRP laminates subjected to cyclic excitations

Abstract

In this research, an investigational study on the use of CFRP laminates with 4 types of configurations (Series-A: laminated with confinement wrap, Series-B: single flat & L wrap, Series-C: confinement wrap, and Series-D: double flat & confinement wrap) to repair partially damaged reinforced cement composite column-beam joints is presented. The project's primary goal was to examine how retrofitting configurations affected the behaviour of repaired RC column-beam junctions when subjected to cyclic loads (FL + RL). To examine the effectiveness of repairs for enhancing the stiffness, strength capacity, and behaviour of damaged RC joints (Partially -25%, 50%, and 75%), seventeen samples were fabricated and investigated. Cyclic loading was used to test the control specimen all the way to failure. Sixteen samples were subjected to a load level that was around 75% of the projected pre-failure load (26 kN) under seismic condition. The maximum load, ductility index, and load versus displacement were all used to analyse the data. Also, CFRP debonding and the failure modes due to fracture pattern were observed. The findings highlighted the significance of repairing and improving joint performance. All repaired joints have increased strength that is virtually as strong as the beam-column joint's actual shear strength. As a result, compared to the reference specimen, the Series-D joints had a substantially greater strength capacity (30.77%).

Transient state analysis of rehabilitated RC beams using finite element modelling and prediction using an artificial neural network

“…Specifically, CFRP outperformed GFRP and AFRP, displaying the least deflection among the rehabilitated variants. Monitoring mid-span displacement is paramount for ensuring structural integrity, as it aids in verifying compliance with deflection criteria set by reference articles [17]. This preventive measure safeguards against issues such as excessive sagging or bending, which could compromise the structural functionality and aesthetic appeal of the entire system.…”

Enhancing PVCC beam performance through PVA fiber and basalt fabric in sustainable construction: ductility, strength, and energy absorption improvements

“…By providing PVCC layer at the cover zone may assist the tension face concrete to arrest tension cracks. To evaluate the structural behavior of the wrapped RC Rectangular beam, the naturalbased basalt fiber fabric wrapping was provided at bottom alone and bottom with side faces of the beam up to the neutral axis [43]. These wrapping may assist the tension face of concrete to arrest tension cracks and also assist side faces of concrete to arrest shear cracks.…”

Experimental investigation on granite waste and alccofine in concrete

“…Meanwhile, P corresponds to the maximum load borne by the specimen in Newtons, where L = L/2. A scanning electron microscope (SEM), SEM analysis, or an X-ray diffraction test were used to investigate the microstructure [25,26]. Through research, the ideal replacement proportion was established to be 10% AF+ 100% OPC+15% GD + 85% M Sand + 1% SP.…”