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- 저자 : Qihan Shen (검색결과 2 건)
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Seismic Behavior Investigation on Blind Bolted CFST Frames with Precast SCWPs
Jingfeng Wang,Qihan Shen,Beibei Li 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
To explore seismic behavior of blind bolted concrete-fi lled steel tube (CFST) frames infi lled with precast sandwich composite wall panels (SCWPs), a series tests of blind bolted square CFST frames with precast SCWPs under lateral low-cyclic loading were conducted. The infl uence of the type of wall concrete, wall-to-frame connection and steel brace setting, etc. on the hysteretic curves and failure modes of the type of composite structure was investigated. The seismic behavior of the blind bolted CFST frames with precast SCWPs was evaluated in terms of lateral load–displacement relation curves, strength and stiff ness degradation, crack patterns of SCWPs, energy dissipation capacity and ductility. Then, a fi nite element (FE) analysis modeling using ABAQUS software was developed in considering the nonlinear material properties and complex components interaction. Comparison indicated that the FE analytical results coincided well with the test results. Both the experimental and numerical results indicated that setting the external precast SCWPs could heighten the load carrying capacities and rigidities of the blind bolted CFST frames by using reasonable connectors between frame and SCWPs. These experimental studies and FE analysis would enable improvement in the practical design of the SCWPs in fabricated CFST structure buildings.
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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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