Abstract
Introduction: This paper discusses the seismic characteristics of the composite structural joint between the Encased Concrete Filled Steel Tubular (ECFST) Column and Reinforced Concrete (RC) beam. The hysteresis behaviour, envelope curves, ductility, rigidity degradation, energy absorption capacity, and equivalent viscous damping coefficient are also discussed. Methods: In this study, the reinforcement placed longitudinally in the RC beam, which is disunited at the joint due to the tubular section of the ECFST column, is connected by providing links in the form of steel rings at the joint. In this study, four specimens with circular steel rings and square concrete casing along with two control specimens are considered. The number of ring layers and concentric rings are used in different combinations among the specimens. Results: The structural connection with the circular steel rings and square concrete casing at the ECFST column and RC beam joint showed superior seismic performance due to the provision of the longitudinal bar and the increased confinement at the joint due to the steel rings and additional concrete casing. Conclusion: A comparative study was done between the experimental studies and the numerical analysis from the finite element developed using ANSYS. It was found that the experimental investigation results matched with the finite element analysis.
Highlights
This paper discusses the seismic characteristics of the composite structural joint between the Encased Concrete Filled Steel Tubular (ECFST) Column and Reinforced Concrete (RC) beam
The lateral load and displacement of the ECFST column and RC beam are measured for drawing the hysteresis loops
The model specimens with square casing and circular steel ring, SC-21 and SC-22 gets collapsed at a lateral load of 21.1 kN & 20.7 kN with a lateral displacement of 35.7 mm & 35.6 mm respectively
Summary
This paper discusses the seismic characteristics of the composite structural joint between the Encased Concrete Filled Steel Tubular (ECFST) Column and Reinforced Concrete (RC) beam. Nie et al [1] tested specimens on a composite column with a tube filled concrete and reinforced concrete beams throughcolumn connection with steel rings provided at the joint that acts as a stiffening ring He experimentally observed that the load-carrying capacity and yield deflection to the ultimate deflection ratio got increased significantly. Liao et al [7] performed tests on ECFST column and RC beams under axial load and reversed cyclic loading They concluded that it had more strength, ductility and energy absorption characteristics when subjected to seismic forces. Zhang et al [14] established a system of connection for concrete-filled twin steel tube and Reinforced Concrete beam and analyzed for seismic loading They concluded that the new joint arrangement showed good aseismic behaviour
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