In-plane creep behaviour of concrete-filled steel tubular arches

Publisher:
Taylor & Francis Group
Publication Type:
Conference Proceeding
Citation:
Proceedings of the 13th International Symposium on Tubular Structures - ISTS13, 2010, pp. 607 - 613
Issue Date:
2010-01
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This paper presents a theoretical analysis for the in-plane creep behaviour and buckling of Concrete-Filled Steel Tubular (CFST) circular arches due to creep and shrinkage of the concrete core under a sustained uniform radial load. The algebraically tractable age-adjusted effective modulus method is used to model the creep behaviour of the concrete core, based on which the differential equations of equilibrium for the time-dependent analysis of CFST arches are derived and analytical solutions for the long-term displacements, stresses and internal forces of CFST arches under the sustained load are obtained. It is shown that the visco-elastic effects of creep and shrinkage of the concrete core have significant long-term effects on the in-plane structural behaviour of CFST arches. The creep radial and axial displacements, and the long-term bending moment increase substantially with time. It is demonstrated that the time-dependent change of the equilibrium configuration of the CFST arch can lead to a buckling configuration being attained in the long-term under a sustained load. The solution for the possible prebuckling structural life time for creep buckling of deep CFST arches has been derived.
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