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      • Study and design of assembled CFDST column-beam connections considering column wall failure

        Lei Guo,Jingfeng Wang,T.Y. Yang,Wanqian Wang,Binggen Zhan 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.2

        Currently, there is a lack of research in the design approach to avoid column wall failure in the concrete filled double skin steel tubular (CFDST) column-beam connections. In this paper, a finite element model has been developed and verified by available experimental data to analyze the failure mechanism of CFDST column-beam connections. Various finite element models with different column hollow ratios () were established. The simulation result revealed that with increasing  the failure mode gradually changed from yielding of end plate, to local failure of the column wall. Detailed parametric analyses were performed to study the failure mechanism of column wall for the CFDST column-beam connection, in which the strength of sandwiched concrete and steel tube and thickness of steel tube were incorporated. An analytical model was proposed to predict the moment resistance of the assembled connection considering the failure of column wall. The simulation results indicate that the proposed analytical model can provided a conservative prediction of the moment resistance. Finally, an upper bound value of  was recommend to avoid column wall failure for CFDST column-beam connections.

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