Connections between RC beam and square tubed-RC column under axial compression: Experiments

Zhou, Xu; Li, Bin yang; Gan, Dan; Liu, Jie Peng; Chen, Y. Frank

doi:10.12989/scs.2017.23.4.453

Cited by 17 publications

(13 citation statements)

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“…However, in the conventional RC joint system, additional steel bars need to utilize to improve the shear resistance, 21 which increases the difficulty of construction. Therefore, Zhou et al 22,23 proposed a relatively new detailing for TRC column-RC beam joints in which the joint zone was encased by the steel tube with opening holes (Figure 1B). In particular, the joint tube is used to improve the joint strength and the opening holes are used to penetrate the longitudinal rebars in RC beams.…”

Section: F I G U R Ementioning

confidence: 99%

“…The hysteretic behavior of an isolated column or a joint would be different from that in the whole structural system. In this study, a pseudo-static test was conducted on two 1/2 scale two-story two-bay frames containing circular TRC (CTRC) columns and RC beams, in which an innovative beam-column connection proposed by Zhou et al 22,23 with the joint zone encased by the steel tube with opening holes (Figure 1B) was employed and a relatively thin-walled column steel tube (i.e., diameter-to-thickness ratio D/t = 120) was considered. The column-beam strength ratio (η) was considered as the main parameter in the test, where two different η values (3.0 and 0.9) were taken to achieve different failure modes.…”

Section: F I G U R Ementioning

confidence: 99%

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Experimental and numerical investigations on seismic behavior of circular tubed reinforced concrete column to RC beam frames

Liu

Zhou

et al. 2022

Earthq Engng Struct Dyn

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The tubed reinforced concrete (TRC) column is a special kind of concrete‐filled tube (CFT) column where the steel tube is disconnected at the beam–column connection, thereby not directly carrying the axial load while maximizing the confinement effect. Extensive research has been conducted to study the static and seismic performances of TRC columns and their mechanical properties. However, little attention has been paid to study the whole structural system containing TRC columns. To fill this lacking information, an experimental program on the seismic behavior of circular tubed reinforced concrete (CTRC) column to reinforced concrete (RC) beam frames (CTRC frames) was presented in this study for the first time. Two half‐scale two‐story CTRC frames, with two bays in each frame, were designed and tested under quasi‐static loads. The first frame has strong columns and weak beams; while the second frame has rather weak columns and strong beams, implying that plastic hinges may form in the columns under seismic action. The test results indicate that both frames are sufficiently ductile to effectively dissipate energy. However, for the second frame, more severe damages of beams and columns in the first floor were observed, resulting in the instability of the overall frame. A fiber‐based finite‐element model is established using OpenSees; and the numerical results are generally in good agreement with the test results. Utilizing the numerical model, a parametric study is conducted and the preliminary design suggestions on TRC frames are proposed.

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Section: F I G U R Ementioning

confidence: 99%

Section: F I G U R Ementioning

confidence: 99%

Experimental and numerical investigations on seismic behavior of circular tubed reinforced concrete column to RC beam frames

Liu

Zhou

et al. 2022

Earthq Engng Struct Dyn

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“…However, research on axial compression behavior of other types of joint systems can be referred. Zhou et al [12], [13] carried out axial compressive tests on interior, exterior and corner tubed RC column to RC beam joints. For circular joints, three stiffening methods including strengthening stirrups, steel tube with rectangular openings, and horizontal beam haunches were adopted.…”

Section: Introductionmentioning

confidence: 99%

Axial Compression Behavior of Square Thin-Walled CFST Column to Rc Beam Joints

2022

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To investigate the influence of eccentricity ratio and slenderness ratio on the mechanical properties of eccentric compressed concrete filled steel tubular (CFST) lattice column, the ultimate bearing capacity tests of 20 K shape arrangement lacing strip of four-tube CFST columns were conducted. Based on the stress-strain relationship of CFST and the influence of shear deformation, the equilibrium equation of the mid-section is established and a numerical method for the ultimate bearing capacity of CFST lattice column is proposed. The slenderness reduction coefficient calculation model and equivalent slenderness ratio formula of CFST lattice column are established. Combined with the numerical results and the slenderness ratio reduction coefficient calculation model, the formula of slenderness ratio reduction coefficient is put forward. The comparison between theoretical analysis and experimental results shows that the calculation method of elastic-plastic ultimate bearing capacity of CFST lattice column proposed in this paper is quite accurate. The research outcomes can provide a reference for the application of CFST lattice column and revision of current specifications.

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“…Nowadays, tubed columns exhibit a variety of forms, such as steel tube confined concrete column (Guo et al, 2019; Hoang and Fehling, 2017; Liu et al, 2018), FRP confined concrete column (Albanesi et al, 2007; Hadi et al, 2015; Mohamed and Haitham, 2012; Zhu et al, 2005), PVC confined concrete column (Abdulla, 2017; Askari et al, 2020; Wang and Yang, 2012), and PVC-FRP Confined Concrete (PFCC) column (Fakharifar and Chen, 2016; Fang et al, 2020; Jiang et al, 2014a; Yu et al, 2018), etc. Compared with the researches on component level of these tubed columns, the studies dealing with the connection between the tubed column and Reinforced Concrete (RC) beam were still limited (Han et al, 2009; Zhou et al, 2017a).…”

Section: Introductionmentioning

confidence: 99%

“…Several similar strengthening measures were also adopted to deal with the tubed column and RC beam joint, such as tube with rectangular openings, horizontal haunches (Zhou et al, 2017b), internal diaphragms (Gan et al, 2018), and stiffening ribs (Zhou et al, 2017a). A series of experiments were conducted to investigate the performances of those suggested composite joints and test results showed that the connections were feasible and exhibited favorable seismic performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on low-strength concrete joint core strengthened with steel meshes for connecting PFCC column and RC beam

Feng

Fang

et al. 2020

Advances in Structural Engineering

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This paper presented a new joint core strengthened with multi-layer steel meshes for connecting the PVC-FRP Confined Concrete (PFCC) column and Reinforce Concrete (RC) beam. Seven specimens were tested under concentric compression and the effects of several parameters including the height, diameter of specimen and volume ratio of steel mesh on the compressive behaviors were investigated. Test results showed that all the reinforcement yielded successively and eventually the crushing of the concrete dominated the failures of specimens. The ultimate bearing capacity and ultimate equivalent axial strain decreased as the height of specimen increased, while they increased as the diameter of specimen or the volume ratio of steel mesh increased. The ultimate strains of all the reinforcement and concrete increased as the height of specimen increased while they decreased as the diameter of specimen or the volume ratio of steel mesh increased. Considering the influence of height of specimen, a modified formula for conveniently predicting the ultimate bearing capacity of the joint core strengthened with steel meshes was proposed based on the theory of confined concrete and superposition principle of multiple confinement. The predicted results were in good agreement with the experimental data. Additionally, an equivalent stress–strain relationship model of the joint core strengthened with steel meshes was suggested based on the experimental research. The predicted curves agreed well with the measured equivalent stress–strain curves. Moreover, a validated Finite Element (FE) model for the joint core strengthened with steel meshes was developed to conduct parametric studies, which broadened the available experimental results about the mechanical performances of the joint.

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Connections between RC beam and square tubed-RC column under axial compression: Experiments

Cited by 17 publications

References 0 publications

Experimental and numerical investigations on seismic behavior of circular tubed reinforced concrete column to RC beam frames

Experimental and numerical investigations on seismic behavior of circular tubed reinforced concrete column to RC beam frames

Axial Compression Behavior of Square Thin-Walled CFST Column to Rc Beam Joints

Experimental study on low-strength concrete joint core strengthened with steel meshes for connecting PFCC column and RC beam

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