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- 저자 : Yongbo Shao (검색결과 2 건)
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Analysis of Bearing Capacity of Circular Concrete Filled CFRP-Steel Tubular Beam-Column
Kuan Peng,Yongbo Shao,Qingli Wang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.1
In practice, it is common for circular concrete-filled CFRP-steel tube (C-CF-CFRP-ST) member severing under eccentric load, but there are few related investigations on its mechanical behavior currently. In this study, experimental study and finite element analysis are employed to reveal the static behavior of circular concrete filled CFRP-steel tube under eccentric compression. Total 32 C-CF-CFRP-ST specimens, taking the slenderness ratio (λ) and eccentric ratio (e) as principal parameters, were designed and tested firstly, obtaining the failure modes, N-um curve and the strains in the steel tube and CFRP. It was found that the damage of concrete became more serious with the decrease of the slenderness ratio but got mitigated with the increase of eccentricity. Additionally, it was indicated that the N-um curve of C-CF-CFRP-ST consisted of three stages, namely elastic stage, elastic-plastic stage and plastic stage. In the elastic-plastic stage, the damage is gradually accumulated in CFRP and concrete, and the specimens finally exhibited ductile failure in the end of plastic stage. In the entire loading process, CFRP has almost same strains compared to the steel tube. Following the experimental study, finite element analysis was conducted to investigate the static behavior of C-CF-CFRP-ST comprehensively. The proposed finite element model reproduced the compressive behavior of C-CF-CFRP-ST, in terms of failure modes and N-um curves. The influence of material strength, layers of CFRP and steel ratio on the static behavior of C-CF-CFRP-ST specimens were then studied through numerical parametric study. In the end, equations for predicting the bearing capacity of C-CF-CFRP-ST are proposed, and the predicted static strengths of the specimens are basically consistent with the experimental results.
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Hysteresis of concrete-filled circular tubular (CFCT) T-joints under axial load
Liu Hongqing,Shao Yongbo,Lu Ning,Wang Qingli 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.18 No.3
This paper presents investigations on the hysteretic behavior of concrete-filled circular tubular (CFCT) T-joints subjected to axial cyclic loading at brace end. In the experimental study, four specimens are fabricated and tested. The chord members of the tested specimens are filled with concrete along their full length and the braces are hollow section. Failure modes and load-displacement hysteretic curves of all the specimens obtained from experimental tests are given and discussed. Some indicators, in terms of stiffness deterioration, strength deterioration, ductility and energy dissipation, are analyzed to assess the seismic performance of CFCT joints. Test results indicate that the failures are primarily caused by crack cutting through the chord wall, convex deformation on the chord surface near brace/chord intersection and crushing of the core concrete. Hysteretic curves of all the specimens are plump, and no obvious pinching phenomenon is found. The energy dissipation result shows that the inelastic deformation is the main energy dissipation mechanism. It is also found from experimental results that the CFCT joints show clear and steady stiffness deterioration with the increase of displacement after yielding. However, all the specimens do not perform significant strength deterioration before failure. The effect of joint geometric parameters β and γ of the four specimens on hysteretic performance is also discussed.
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