Abstract
A new type joint of Circular Tubed Steel-Reinforced Concrete (CTSRC) columns was designed in this paper. The structural characteristics, manufacturing process, and mechanical properties of raw materials of the new joint were introduced. In order to simulate the earthquake action, two joint specimens were subjected to low-cycle cyclic loading at the end of the column. Based on the in-depth study of the failure characteristics, load-displacement hysteretic curve, skeleton curve, ductility index, load-strain hysteretic curve in the core area of the joint, energy dissipation performance, strength and stiffness degradation performance, and shear deformation in the core area of the joint during the whole loading process, the seismic behavior of this new type of joint was investigated. The results show that the new joint has reasonable failure characteristics, high bearing capacity, good ductility, excellent seismic energy dissipation performance, and strong resistance to strength and stiffness degradation, which meets the seismic design principle of “strong joint and weak component” and is suitable for the results with special requirements for seismic performance. In addition, preliminary design recommendations were put forward. The research results of this paper can provide a theoretical basis for the application of this kind of new structure.
Highlights
At present, steel-concrete composite structure has been widely used in the field of civil engineering construction
Concrete-filled steel tubular column and steel-reinforced concrete column are two main forms of steel-concrete composite structure. e concrete-filled steel tubular column makes the concrete in the tube in a three-dimensional compressive stress state through the circumferential restraint effect of the outer steel tube on the concrete in the tube, so as to improve the concrete strength and the bearing capacity of the structural column [1,2,3]
Zhang et al have carried out an experimental study on the seismic behavior of a kind of connection form of concrete-filled steel tubular column and RC beam outer steel tubular unconnected ring beam joint [16]
Summary
Steel-concrete composite structure has been widely used in the field of civil engineering construction. Zhang et al have carried out an experimental study on the seismic behavior of a kind of connection form of concrete-filled steel tubular column and RC beam outer steel tubular unconnected ring beam joint [16]. Gan et al designed a ring reinforced steel tube-confined RC column joint and studied its axial compression and hysteretic behavior [17]. Lin et al analyzed the shear mechanism and shear capacity of framework joints of steel-reinforced concrete-filled circular steel tube (SRCFCST), and the calculation method of composite shear capacity in the core area of joints is proposed, which can provide a reference for nonlinear analysis and engineering design of similar joints [20]. Peng et al designed four specimens of concrete-filled square steel tubular frame joints with unequal beam heights, carried out low-cycle cyclic loading tests, discussed their seismic performance, and analyzed their shear capacity [24]. It provides a theoretical basis for the popularization and application of this kind of new structure
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