Abstract
In this paper, in order to investigate the shear mechanism and shear capacity of framework joints of steel‐reinforced concrete‐filled circular steel tube (SRCFCST), a numerical finite element model reflecting the mechanical behavior of framework joints of SRCFCST column‐reinforced concrete beam is established through simulating concrete by the damage plastic constitutive model and simulating steel by the ideal elastic‐plastic material, and its effectiveness is verified by experimental data. On account of uniform distribution of circular steel reinforced around the section and without definite flange and web, the shear mechanism of the framework joints of SRCFCST is analyzed on the basis of equivalent circular steel tube (CST) to the rectangular steel tube. The method for calculating the superposed shear bearing capacities of the joint core area is proposed, which is composed of four parts, i.e., concrete inside tube, concrete outside tube, hooping and steel‐reinforced web; and the corresponding formulas for calculating shear bearing capacity are established. The comparative analysis of joints’ shear bearing capacity indicates that the results of numerical simulation and shear bearing capacity formulas coincide well with the experimental values, which can provide reference for the nonlinear analysis and engineering design of similar joints.
Highlights
Steel-reinforced concrete structure is a structure composite of steel and reinforced concrete, abbreviated to SRC structure
Compared to general SRC structure, the circular steel tube (CST)-reinforced tube in SRC columns has the advantages of simple and easy fabrication, and steel is evenly distributed around the section, which is very beneficial to the corner columns bearing biaxial bending
At present, the researches on SRC structure mainly focus on general SRC structure, and few have been carried out on the steel-reinforced concretefilled circular steel tube (SRCFCST) structure [4]
Summary
Steel-reinforced concrete structure is a structure composite of steel and reinforced concrete, abbreviated to SRC structure. Nie et al [15] proposed a new connection system for a concrete-filled steel tube composite column and reinforced concrete beams and analyzed the mechanical properties of this type of connection under the action of seismic load and found that the effective confinement can be achieved by the stiffening ring, and an excellent axial bearing capacity can be obtained, as well as a superior ductility and energy dissipation capacity. Ding et al [17] conducted a cyclic loading test on a group of nonthrough-core connection, established the finite element model for calculation and analysis, discussed its strain curve, ductility curve, stiffness degradation curve, and energy dissipation curve, and concluded that SRCFCST joints had better seismic performance than ordinary reinforced concrete beam-column joints. On account of uniform distribution of circular steel reinforced around the section and without definite flange and web, the shear mechanism of concrete inside tube, concrete outside tube, hooping, and steel-reinforced web in joint core area is analyzed on the basis of equivalent CST to the rectangular steel tube; and the formulas for calculating the superposed shear bearing capacities of the joint core area is proposed. e comparative analysis of joints’ shear bearing capacity indicates that the results of numerical simulation and shear bearing capacity formulas coincide well with the experimental values, which can provide reference for the nonlinear analysis and engineering design of similar joints
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