Stability of Reinforced Concrete Shells: State-of-the-Art Overview


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Title: Stability of Reinforced Concrete Shells: State-of-the-Art Overview

Author(s): Egor P. Popov and Stefan J. Medwadowski

Publication: Special Publication

Volume: 67


Appears on pages(s): 1-42

Keywords: loads (forces); reinforced concrete; shrinkage; stability; structural a buckling; cracking (fracturing); creep properties; shells (structural forms); nalysis; structural design.

Date: 1/1/1981

Over the last few decades, shell structures have become bigger--they cover larger areas without intermediate supports and thinner. Because of this, the problem of buckling of shells has grown in importance. This paper contains an overview of the general problem of stability of reinforced concrete shells. The buckling phenomenon is defined and its manifestations in columns, plates, and shells are discussed. The linear critical load concept is reviewed first, followed by a consideration of geometric nonlinearities and of geometric imperfections of the shape of the shell as built. Next, the material properties of reinforced con-crete and its response under load are reviewed. The properties of inelastic behavior of concrete and reinforcement, the cracking of concrete, the amount of reinforcement, and the effects of concrete shrinkage and creep are discussed. These factors make the buckling behavior of reinforced concrete shells significantly different from metallic shells and cause a reduction in the load-carrying capacity of the shell. Current approaches to shell stability analysis and design are commented on.