Issue: 1(20), 2012. Series: Multi-Topic

DEFORMATION OF SHALLOW RIBBED SHELLS UNDER THE CONDITIONS OF PHYSICAL NONLINEARITY AND CREEP OF CONCRETE

UDK: 539.3

Panin A. N.

The article gives a study of the stress-strain state of shallow ribbed reinforced concrete shells under the action of short-term and long-term loading. It is assumed that the rheological properties of reinforced concrete comply with the linear theory of hereditary creep. The results of structural analysis and of stability analysis for ribbed shells were studied applying the PologObolochka software. Also, these results were compared with the analogous ones of the analysis for unribbed shells for both linear elastic deformation problems and creep problems. Under the action of long-term loading, the crash time for a shell to lose stability through creep is determined. It is shown that while studying shallow reinforced concrete ribbed shells such factors as geometrical nonlinearity and transverse shear can be neglected.

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