Parametric Study on Fatigue Behaviour of Beam - Column Joint Retrofitted with Various Patterns of Fibre Reinforced Polymer Sheets

Abstract

Shear failure of B-C joints is recognized as the primary cause of collapse of various moment-resisting frame buildings during recent earthquakes. When B-C joint subjected to huge forces during severe ground shaking and its behaviour has a very much influencing on the structure, sometimes it may Leeds to collapse of entire structure. To study the energy dissipation of B-C joint with different types and combinations of FRP sheets used to retrofit the BC joint in this study. Fiber reinforced polymer is composite material made up of polymer matrix reinforced with fibres. It is alternative method for retrofitting of structures. In this project work, a RC beam- column joint model was developed and externally wrapped with FRP sheets using ABAQUS-CAE. Then parametric study was carried out for beam-column joint retrofitted with various pattern of FRP sheets like different orientation, layers and material of fibres. Various materials of the fibres used carbon, glass and basalt. Orientation of fibres were used like 00,- 450,450,900 and combinations of CFRP&GFRP, CFRP&BFRP and GFRP&BFRP were used in this parametric study. Finally FEA analysis was compared and discussed with respect to layers and materials of fibres. Specimens with B-C joint are retrofitted with FRP and their performances are compared with corresponding un-retrofitted specimens under cyclic loading. It has been found that after retrofitted with CFRP, GFRP and BFRP the energy dissipation capacity had increases to 44.56, 46.3 and 60.58% and stiffness, ductility also increased. Key Words: Finite Element Method (FEM); Beam- column joints; Carbon fibre reinforced polymer (CFRP); Glass fibre reinforced polymer (GFRP); Basalt fibre reinforced polymer (BFRP); Strengthening.