Abstract
Synopsis Cover to the stirrups in reinforced concrete structures is one of the important parameters in the theory of confined concrete, On the basis of experimental results, a new term ‘effective confinement index’ is introduced. The expressions for increase in maximum stress and the corresponding strain in terms of effective confinement index are given. Theory is developed to obtain the stress–strain curve of total condtere with confined core and unconfined cover. The experimental and analytical stress–strain curves are compare. Also the maximum stresses and the corresponding strains of shell concrete are compared with the results obtained by the theory of sargin et al.
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