Seismic performance of fiber-reinforced concrete interior beam-column joints

Performance of Reinforced Reactive Powder Concrete Beam-Column Joints under Cyclic Loads

“…e microcracks in concrete can reclose under the axial compressive force, and it is bene cial for improving the shear strength of concrete by properly increasing the axial compressive force within a certain range. A similar behavior was reported by other researchers [8,26,27] in which the joint shear strength moderately increases as the axial load level increases within a certain range. On the other hand, the increase in the axial compressive force can reduce ductility of beam-column joint.…”

“…Kotsovou and Harris [7] proposed a method for the seismic design of beam-column joints and proved its validity. Researches have demonstrated that the spacing of stirrups in the joint area can be decreased by using steel fiber-reinforced concrete instead of normal concrete [8][9][10]. In other words, using fiber concrete or new design approaches can reduce the amount of stirrups, which is convenient for construction.…”

Seismic Behavior and Shear Bearing Capacity of Ultra-High Performance Fiber-Reinforced Concrete (UHPFRC) Beam-Column Joints

“…Average shear stress value (V jcr /(b j h j )) of UHPFPC joint is 3.84 MPa when cracks appear in the joint area. The average crack shear stress value of total 22 NC joints from literature [5,18,19] is 2.60, which is 32.3% smaller than that of UHPFPC joint. This may be explained by the fact that UHPFRC has a higher tensile strength and ultimate tensile strain than high-strength concrete and NC without steel fiber.…”

“…In order avoid shear failure, a high percentage of transverse stirrups are required in the joint core [1], which may lead to reinforcement congestion and, thus, construction difficulties in casting concrete in the joint regions [2,3]. Fiber RC may be a feasible solution to reduce the congestion of stirrups in the beam-column joint core [4,5]. The main objective of this research is to provide experimental evidence of the behavior of beam-column joints with UHPFRC under earthquake loads and with various design parameters, and determine the effect of UHPFRC on the shear bearing capacity of beam-column joints.…”

Seismic Performance of Exterior RC Beam–Column Joints Retrofitted using Various Retrofit Solutions

“…15a, the control specimen J-0 exhibited high deformation capacity exceeding 5% in load-drift hysteretic response, even though pinching was severe and significant strength degradation was observed after the peak load. It is noted that the pinching effect of the load-drift hysteretic response leads to low energy dissipation of the specimens (Liang et al 2016). In the negative loading direction, the yielding of longitudinal re-bars was not observed; meanwhile, in the positive loading direction, the longitudinal rebars had yielded at a drift ratio of 0.92%.…”