Experimental Study on Structural Characteristics of Portal Frames Consisting of Square CFT Columns

Kawaguchi, Jun; Morino, Shosuke; Sugimoto, Takashige; Shirai, Junya

doi:10.1061/40616(281)63

Cited by 7 publications

(6 citation statements)

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“…As an improved form of traditional composite structures, the investigations of CFT frames provide some research directions for TRC frames. Kawaguchi et al 24 . presented the test results of 10 CFT frames under cyclic loading and indicated that the test frames exhibited better energy dissipation capacity than steel frames.…”

Section: Introductionmentioning

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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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: Introductionmentioning

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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“…A wide range of prior researches was conducted on components of CFT-systems. So far, research on CFT-moment resisting frame (MRF) structures, which consist of CFT columns and steel beams, has been limited [5][6][7][8][9]. In recent years, notable studies have been dedicated to the attempt to perceive the seismic performance of composite buildings [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Kawaguchi et al [5] carried out an experimental study on one-bay portal frames under constant axial load and cyclic lateral loading. The results show that all frames have appropriate hysteresis performance.…”

Section: Introductionmentioning

confidence: 99%

Seismic Failure Probability and Vulnerability Assessment of Steel-Concrete Composite Structures

Ahmadi

Naderpour

Kheyroddin

et al. 2017

Period. Polytech. Civil Eng.

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Building collapse in earthquakes caused huge losses, both in human and economic terms. To assess the risk posed by using the composite members, this paper investigates seismic failure probability and vulnerability assessment of steel-concrete composite structures constituted by rectangular concrete ﬁlled steel tube (RCFT) columns and steel beams. To enable numerical simulation of RCFT-structure, the details of components modeling are developed using OpenSEES finite element analysis package and the validation of proposed procedure is investigated through comparisons with available experimental results. The seismic fragility and vulnerability curves of RCFT-structures are created through nonlinear dynamic analysis using an appropriate suite of ground motions for seismic loss assessment. These curves developed for three-, six- and nine-story prototypes of RCFT-structure. Fragility curves are an appropriate tool for representing the seismic failure probabilities and vulnerability curves demonstrate a probability of exceeding loss to a measure of ground motion intensity.

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“…Tomii and Sakino [2], Morino et al [3], Inai et al [4], and Varma et al [5] performed tests on columns, Tsai and Popov [6], Schneider and Alostaz [7], Uang et al [8], Ricles et al [9], and Sheet et al [10] on beams and connections, and Kanatani et al [11], Koester et al [12], Fukumoto and Morita [13], and Sheet et al [10] on panel zones (PZs). Kawaguchi et al [14] tested 10 reduced-scale one-story, one-bay CFT-MRFs, under constant vertical loads on columns and alternately repeated horizontal load to clarify their strength and deformation capacity. Each frame was designed as a strong-beam weak-column system, was calibrated by Skalomenos et al [22] for a wide range of values of the geometrical and strength parameters and (ii) the model is a simple concentrated plasticity model that can provide very good predictions of the force-deformation responses of CFT columns to cyclic loading, which exhibit material deterioration.…”

Section: Introductionmentioning

confidence: 99%

Modeling level selection for seismic analysis of concrete‐filled steel tube/moment‐resisting frames by using fragility curves

Skalomenos

Hatzigeorgiou

Beskos

2014

Earthq Engng Struct Dyn

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The seismic behavior of plane moment-resisting frames (MRFs) consisting of I steel beams and concretefilled steel tube (CFT) columns is investigated in this study. More specifically, the effect of modeling details of each individual component of CFT-MRFs, such as the composite CFT columns, the beam-column connections, the panel zones, and the steel I beams on their seismic behavior, is studied through comparisons against available experimental results. Then, fragility curves are constructed for three typical CFT-MRFs, designed according to European codes, for various levels of modeling sophistication through nonlinear time-history analyses. On the basis of these fragility curves, one can select the appropriate modeling level of sophistication that can lead to the desired seismic behavior for a given seismic intensity.with the beams designed to remain elastic. Local buckling occurred at the base of the columns, leading to strength degradation. They concluded that these CFT-MRFs showed better hysteretic characteristics than a weak-beam strong-column MRF with wide flange steel columns. Chen et al. [15] performed pseudodynamic tests on a full-scale three-bay composite frame, which included a braced frame in the central bay and moment connection between steel beams and CFT columns in the exterior bays. The study reported that the presence of the braces limited the inelastic demand imposed on the moment connections and that most of the energy was dissipated by the buckling restrained braces, with only minor yielding observed in all the moment connections. Herrera et al.[16] conducted pseudodynamic tests on approximately half scale of a two-bay four-story composite MRF with a basement level, using performance-based design concepts. A weak-beam strong-column concept in the design and a spilt tee beam-to-column moment connection were used to enable plastic hinges to form in the beams. The test structure response was consistent with the expected performance for all seismic input levels, indicating that a very good seismic performance of composite MRFs with CFT columns can be achieved. Tsai et al. [17] conducted tests on a full-scale three-story, three-bay CFT buckling restrained braced frame. Square CFTs were used for the two exterior columns and circular CFTs for the two center columns. Three types of moment connections were used in the exterior beam-column connections, specifically through beam, external diaphragm, and bolted end-plate connections. A series of six pseudodynamic tests were conducted subjecting the frame to ground motions of various intensities, and then, a quasi-static cyclic load protocol was applied until fracture of the braces. The braces were replaced, and another series of pseudodynamic tests were performed. Vibration tests were conducted after each pseudo dynamic test to measure the changes in stiffness and damping, and only minor changes were observed.Besides the experiments, there have been reported numerous analytical studies in the literature on CFT-MRFs components and systems, including column...

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Experimental Study on Structural Characteristics of Portal Frames Consisting of Square CFT Columns

Cited by 7 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

Seismic Failure Probability and Vulnerability Assessment of Steel-Concrete Composite Structures

Modeling level selection for seismic analysis of concrete‐filled steel tube/moment‐resisting frames by using fragility curves

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