Abstract
Beam-column (BC) joints are the most crucial zones of structures wherein that region, the bond, and normal stresses are comparatively higher. In the present study, the seismic performance of the joint region has been improved with reinforcement with various fibers (polypropylene fiber and steel fiber). Tests are performed with various fiber types in the BC joints under a 100 kN capacity cyclic actuator. The output attributes considered are load, displacement, degradation in the stiffness, drift angle, and dissipation of energy in the BC joint. The specimens have also been computationally modeled and analyzed for static cases using ANSYS-v14 software. Static analysis procedure has been used to determine the key parameters like displacement, stress, strain, and forces in structural components due to the loads. Percentages of polypropylene fiber are varied between 0.15 - 0.50% and the steel fiber is kept constant at 0.75%, while the control specimen (CS) prepared with only normal concrete of mix M25 grade of concrete with characteristic cube compressive strength of 25 MPa without any fibers. Results indicate that the specimen having 0.25% polypropylene and 0.75% steel fiber exhibits better performance under reversed cyclic loading. Further, improvement in BC joints in terms of strength and ductility has been observed in presence of hybrid fibers.
Highlights
Beam-column (BC) joints have a vital role in the reliability of the structural system of the buildings
The behavior of the test specimens with various types of fibers is examined, and the specimen giving reliable performance under reverse cyclic load is identified. It has been observed from the tests that the application of hybrid fibers would be helpful in the improvement of the strength and ductility of the BC joints
Performance of the beam-column joint with hybrid and non-hybrid fiber reinforced concrete specimens using various types of fibers under reversed cyclic loading are examined in the present case
Summary
Beam-column (BC) joints have a vital role in the reliability of the structural system of the buildings. The stress reversal by moments in beam-column joints may cause the formation of higher joint shear forces in the joint area when subjected to seismic excitations [2] Due to this reason, BC joints are to be designed for enough strength and stiffness to ensure overall stability and structural integrity. The occurrence of diagonal cracking and crushing of concrete in the joint area can be avoided either by assigning large column sizes and by applying closed-loop closely spaced lateral ties around column main steel bars [18]. The behavior of the test specimens with various types of fibers is examined, and the specimen giving reliable performance under reverse cyclic load is identified It has been observed from the tests that the application of hybrid fibers would be helpful in the improvement of the strength and ductility of the BC joints
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