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مجله بین المللی مکانیک غیر خطی
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  • long-term non-linear behaviour and buckling of shallow concrete-filled steel tubular arches

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 925
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     this paper presents a theoretical analysis for the long-term non-linear elastic in-plane behaviour and buckling of shallow concrete-filled steel tubular (cfst) arches. it is known that an elastic shallow arch does not buckle under a load that is lower than the critical loads for its bifurcation or limit point buckling because its buckling equilibrium configuration cannot be achieved, and the arch is in a stable equilibrium state although its structural response may be quite non-linear under the load. however, for a cfst arch under a sustained load, the visco-elastic effects of creep and shrinkage of the concrete core produce significant long-term increases in the deformations and bending moments and subsequently lead to a time-dependent change of its equilibrium configuration. accordingly, the bifurcation point and limit point of the time-dependent equilibrium path and the corresponding buckling loads of cfst arches also change with time. when the changing time-dependent bifurcation or limit point buckling load of a cfst arch becomes equal to the sustained load, the arch may buckle in a bifurcation mode or in a limit point mode in the time domain. a virtual work method is used in the paper to investigate bifurcation and limit point buckling of shallow circular cfst arches that are subjected to a sustained uniform radial load. the algebraically tractable age-adjusted effective modulus method is used to model the time-dependent behaviour of the concrete core, based on which solutions for the prebuckling structural life time corresponding to non-linear bifurcation and limit point buckling are derived.

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