Seismic Performance of Full‐Scale Joints Composed by Concrete‐Filled Steel Tube Column and Reinforced Concrete Beam with Steel Plate‐Stud Connections

Abstract

A concrete-filled steel tube (CFST) column has the advantages of high bearing capacity, high stiffness, and good ductility, while reinforced concrete (RC) structure systems are familiar to engineers. The combinational usage of CFST and RC components is playing an important role in contemporary projects. However, existing CFST column-RC beam joints are either too complex or have insufficient stiffness at the interface, so their practical engineering application has been limited. In this study, the results of a practical engineering project were used to develop two kinds of CFST column-RC beam joints that are connected by vertical or U-shaped steel plates and studs. The seismic performance of full-scale column-beam joints with a shear span ratio of 4 was examined when they were subjected to a low-cyclic reversed loading test. The results showed a plump load-displacement curve for the CFST column-RC beam joint connected by steel plates and studs, and the connection performance satisfied the building code. The beam showed a bending failure mode similar to that of traditional RC joints. The failure area was mainly concentrated outside the steel plate, and the plastic hinge moved outward from the ends of the beam. When the calculated cross section was set at the ends of the beam, the bending capacity of joints with the vertical or U-shaped steel plates and studs increased compared to the RC joint. However, when the calculated cross section was set to the failure area, the capacity was similar to that of the RC joint. The proposed joints showed increases in the energy dissipation, average energy dissipation coefficient, and ductility coefficient compared to the RC joint.

Experimental study on seismic behavior of RC beams confined by corroded stirrups

“…performed three times at each stage (Li et al, 2019). The loading process of each stage is divided into four steps: loading, unloading, reverse loading and unloading (Kanchanadevi and Ramanjaneyulu, 2018).…”

“…In this case, the force loading control was conducted before specimen yielded for all RC specimens. After yielded, the RC specimen was loaded to failure by displacement loading control with a displacement increment of the yield displacement Δ y , and the load was performed three times at each stage (Li et al ., 2019). The loading process of each stage is divided into four steps: loading, unloading, reverse loading and unloading (Kanchanadevi and Ramanjaneyulu, 2018).…”

Investigation on Shear Capacity of Joints between Steel Reinforced Concrete Special-Shaped Column and Reinforced Concrete Beam

“…Therefore, it is an excellent structure form that deserves to be promoted and studied. Nowadays, some experiments and researches on SRC structures (Chen et al, 2020) and SRC-RC column joints (Li et al, 2019) are being conducted. But, there are still few experimental and research results relevant to SRCSS column joints, especially on the shear performances in the joint core areas.…”

Test on Hysteretic Behaviour of Prestressed Composite Joints with Concrete‐Encased CFST Columns

“…For composite joints, Li et al [28] tested the seismic performance of two kinds of CFST column-RC beam joints that are connected by vertical or U-shaped steel plates and studs and bending capacity of joints increased compared to the RC joints; Qian and Jiang [29] tested the joints consisting of reinforced concrete beams and concrete-encased CFST columns under cyclic loading, and it is observed that the energy dissipation capacity could be enhanced and the shear deformation could be decreased when the stirrup spacing reduced in the panel zones for weak joints; Liao et al [30] and Nie et al [31] pointed out that the composite joints consisting of reinforced concrete beams and concreteencased CFST columns with the outer stiffening ring also showed good hysteretic behaviour; Qian et al [32] investigated the mechanical mechanism of composite joints consisting of steel beams and concrete-encased CFST columns by validated numerical model, and it is found that the positive and negative capacities of the spatial joints under bidirectional loading were about 14% and 18% lower than those of the planar joints; additionally, Deng et al [33] experimentally studied the crack development and rigidity of joints consisting of prestressed reinforced concrete beams and concrete-encased CFST columns. Although a number of tests and analysis on composite joints with concrete-encased CFST columns have been performed, so far seismic performance and design approaches for the proposed innovative prestressed composite joints have not been reported.…”