Prediction of the Inelastic Behavior of One-Way Continuous Slabs


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Title: Prediction of the Inelastic Behavior of One-Way Continuous Slabs

Author(s): B. V. Subrahmanyam

Publication: Journal Proceedings

Volume: 76

Issue: 5

Appears on pages(s): 621-634

Keywords: crack width and spacing; deflection; loads (forces); moment distribution; one-way slabs; reinforced concrete;moment-curvature relationship.

Date: 5/1/1979

One-way continuous slabs designed according to the redistributions permitted by ACI 318 have considerable reserve load-carrying capacity because of their large plastic rotation capacities. Methods are necessary for reliable prediction of the behavior of one-way continuous slabs so that a more realistic and economical design basis can be developed. This paper reports tests on two-span continuous slabs designed with different degrees of redistribution. Utilizing the results of these tests and those of tests reported in literature, it is established that trisegmental M-+ relations give excellent predictions of the inelastic behavior of one-way continuous slabs at all the limit states (deflection, crack width, and plastic rotation compatibility). In contrast, bilinear relations and constant stiffness assumption give poor and even unsafe predictions and hence are shown to be unreliable.