Creep influence on buckling resistance of reinforced concrete shells

Creep influence on buckling resistance of reinforced concrete shells The influence of concrete creep on the response of shallow reinforced concrete shells is analyzed in this contribution in the context of time-dependent shell buckling. The classical time-invariant stability analysis is extended to account for the long-term creep buckling, which is characterized by a continuous increase of deformation and time-dependent stability failure, if a certain critical load factor is exceeded. For a systematic study of these phenomena on a cylindrical roof shell, a recently proposed time-invariant and a time-dependent material model for concrete are combined in the framework of the long-term multi-level simulation concept, taking into account elasto-plastic deformation, crack damage and nonlinear basic creep of concrete. The performed numerical analyses provide an insight into the mechanisms of creep buckling of reinforced concrete shells as well as its sensitivity with respect to main influence factors and emphasize the relevance of interaction mechanisms between short- and long-term loadings. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Computers & Structures Elsevier

Creep influence on buckling resistance of reinforced concrete shells

Computers & Structures, Volume 86 (7) – Apr 1, 2008

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Publisher
Elsevier
Copyright
Copyright © 2007 Elsevier Ltd
ISSN
0045-7949
eISSN
1879-2243
DOI
10.1016/j.compstruc.2007.07.004
Publisher site
See Article on Publisher Site

Abstract

The influence of concrete creep on the response of shallow reinforced concrete shells is analyzed in this contribution in the context of time-dependent shell buckling. The classical time-invariant stability analysis is extended to account for the long-term creep buckling, which is characterized by a continuous increase of deformation and time-dependent stability failure, if a certain critical load factor is exceeded. For a systematic study of these phenomena on a cylindrical roof shell, a recently proposed time-invariant and a time-dependent material model for concrete are combined in the framework of the long-term multi-level simulation concept, taking into account elasto-plastic deformation, crack damage and nonlinear basic creep of concrete. The performed numerical analyses provide an insight into the mechanisms of creep buckling of reinforced concrete shells as well as its sensitivity with respect to main influence factors and emphasize the relevance of interaction mechanisms between short- and long-term loadings.

Journal

Computers & StructuresElsevier

Published: Apr 1, 2008

References

  • Multi-layer multi-director concepts for D-adaptivity in shell theory
    Krätzig, W.B.; Jun, D.
  • Anisotropic modelling and numerical simulation of brittle damage in concrete
    Govindjee, S.; Kay, G.J.; Simo, J.C.
  • An anisotropic elastoplastic-damage model for plain concrete
    Meschke, G.; Lackner, R.; Mang, H.A.
  • Non-smooth multisurface plasticity and viscoplasticity. Loading/unloading conditions and numerical algorithms
    Simo, J.C.; Kennedy, J.G.; Govindjee, S.
  • Insight into finite element shell discretizations by use of the basic shell mathematical model
    Lee, P.S.; Bathe, K.-J.
  • A class of mixed assumed strain methods and the method of incompatible strains
    Simo, J.C.; Rifai, M.S.

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