A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
FINITE ELEMENT INVESTIGATION OF REINFORCED CONCRETE AND STEEL FIBER REINFORCED CONCRETE EXTERIOR BEAM-COLUMN JOINTS UNDER CYCLIC LOADING
Beam-column joints are crucial structural components to ensure the overall stability of reinforced concrete framed structures subjected to seismic loads. A number of research efforts have been devoted to enhance the seismic behavior of beam-column joints. The current codes for reinforced concrete structures requires high amount of transverse reinforcement in joint panel zone to avoid the premature failure of the joint region. However, the main challenge facing these code-based solutions is the use of high amount of closely spaced transverse reinforcements in the beam-column joints leads to abrupt and unpreventable concrete crushing failure. In this study, the behavior of exterior beam-column joints with normal concrete and steel fiber reinforced concrete have been investigated. The main aim of this study is to investigate the use of steel fiber reinforced concrete in reducing the transverse reinforcements in beam-column joint and to explore the influence of varation of column axial loads on steel fiber reinforced concrete beam-column joints under cyclic loading. Nonlinear finite element method with the damaged plasticity model for both normal concrete and steel fiber reinforced concrete in ABAQUS/Standard is adopted to simulate the beam-column joints. The accuracy of the nonlinear finite element models are verified using experimental results conducted by other researchers. Then, an adequate shear reinforced concrete specimen is selected from the validated specimens for a control specimen. A total of nineteen specimens are simulated by varying the volume fraction of steel fiber of 1%, 1.5% and 2% coupling with the reduction of transverse reinforcements in joint from the control specimen and variation of column axial loads. The analysis results revealed that addition of 1%, 1.5% and 2% volume fraction of steel fiber in concrete could effectively accommodate up to 33%, 67% and 100% reduction of transverse reinforcement in beam-column joints, respectively. These results confirmed that the appropriate use of steel fiber in concrete can be a feasible solution to solve the reinforcement congestion problem and improve the joint’s seismic performance. Moreover, an increase of axial load up to 50% of the column capacity improves the crack resistance of steel fiber reinforced concrete joints, however, further increases of axial loads reduce the joints performance due to local crushing of concrete.
FINITE ELEMENT INVESTIGATION OF REINFORCED CONCRETE AND STEEL FIBER REINFORCED CONCRETE EXTERIOR BEAM-COLUMN JOINTS UNDER CYCLIC LOADING
Beam-column joints are crucial structural components to ensure the overall stability of reinforced concrete framed structures subjected to seismic loads. A number of research efforts have been devoted to enhance the seismic behavior of beam-column joints. The current codes for reinforced concrete structures requires high amount of transverse reinforcement in joint panel zone to avoid the premature failure of the joint region. However, the main challenge facing these code-based solutions is the use of high amount of closely spaced transverse reinforcements in the beam-column joints leads to abrupt and unpreventable concrete crushing failure. In this study, the behavior of exterior beam-column joints with normal concrete and steel fiber reinforced concrete have been investigated. The main aim of this study is to investigate the use of steel fiber reinforced concrete in reducing the transverse reinforcements in beam-column joint and to explore the influence of varation of column axial loads on steel fiber reinforced concrete beam-column joints under cyclic loading. Nonlinear finite element method with the damaged plasticity model for both normal concrete and steel fiber reinforced concrete in ABAQUS/Standard is adopted to simulate the beam-column joints. The accuracy of the nonlinear finite element models are verified using experimental results conducted by other researchers. Then, an adequate shear reinforced concrete specimen is selected from the validated specimens for a control specimen. A total of nineteen specimens are simulated by varying the volume fraction of steel fiber of 1%, 1.5% and 2% coupling with the reduction of transverse reinforcements in joint from the control specimen and variation of column axial loads. The analysis results revealed that addition of 1%, 1.5% and 2% volume fraction of steel fiber in concrete could effectively accommodate up to 33%, 67% and 100% reduction of transverse reinforcement in beam-column joints, respectively. These results confirmed that the appropriate use of steel fiber in concrete can be a feasible solution to solve the reinforcement congestion problem and improve the joint’s seismic performance. Moreover, an increase of axial load up to 50% of the column capacity improves the crack resistance of steel fiber reinforced concrete joints, however, further increases of axial loads reduce the joints performance due to local crushing of concrete.
FINITE ELEMENT INVESTIGATION OF REINFORCED CONCRETE AND STEEL FIBER REINFORCED CONCRETE EXTERIOR BEAM-COLUMN JOINTS UNDER CYCLIC LOADING
MUSITEFA ADEM YIMER (author)
2019-11-05
doi:10.20372/nadre/4285
Theses
Electronic Resource
English
DDC:
690
Reinforced concrete beam-column joints under cyclic loading
| British Library Conference Proceedings | 2000
Cyclic Tests of Steel Fibre Reinforced Concrete Exterior Beam-Column Joints
| British Library Conference Proceedings | 1993