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- 저자 : Xuebei Pan (검색결과 2 건)
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Jingfeng Wang,Xuebei Pan,Xiao Peng,Jiaxin Wang 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.6
This paper reported an innovative semi-rigid composite frame comprised of concrete-fi lled steel tubular (CFST) columns and H-shaped steel beams assembled using fl ush or extended end plates with blind fasteners. Two specimens of two-story single-bay end plate moment-resisting square or circular CFST frames were investigated by a series of pseudo-dynamic tests. To analyze dynamic response of this type of structure under the earthquake action, time history response and story drift were investigated. The infl uence of the column section type and the end plate type on seismic performance of semirigid moment-resisting CFST frames under diff erent earthquake loading levels were also discussed according to hysteretic behavior, rigidity degradation and energy dissipation capacity. The experimental and analytical results indicated that at the same section width and steel ratio of the column, the rigidity of end plate moment-resisting square CFST frame was greater than that of circular CFST frame, while the story drift of square CFST frame was smaller than that of circular CFST frame. The type of end plate moment-resisting CFST frames with blind fasteners, which can provide good seismic behavior and energy dissipation ability, can be well used in a seismic region.
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Jingfeng Wang,Qihan Shen,Han Jiang,Xuebei Pan 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.2
To analyze the axial compressive performance of elliptical concrete-fi lled thin-walled steel tube (ECFTST) columns, fi nite element (FE) modeling was built up by ABAQUS software in this paper. The material nonlinearity and the complex interaction between steel tube wall and core concrete in an elliptical section were considered in this numerical analysis. Failure modes and interaction mechanism of ECFTST stub columns were also studied. Moreover, a modifi ed equivalent circular diameter approach for ellipse feature was proposed to substitute for the constitutive relation of ECFTST columns. The prediction accuracy of this method was verifi ed by the comparison of the FE and test results in terms of failure modes, axial compressive capacities and axial force-axial displacement relation curves. Further, the infl uence of diameter-to-thickness ratio, cross-section slenderness and scale eff ect etc. on the performance of ECFTST stub columns were estimated under axial compressive loading. The results of numerical analysis showed that the axial force-axial displacement curves of the ECFTST stub columns were obviously aff ected by the confi nement factor. Lastly, based on the simple superposition approach and the unifi ed theory approach, two simplifi ed design methods were proposed to predict the axial compressive capacities of ECFTST columns.
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