Abstract
Restrained reinforced concrete slabs have load-deflection curves which are similar to those for shallow shells. These curves have a distinct instability following an initial peak. However, most analytical procedures for slabs do not take into consideration the effects of nonlinear geometry, but attribute the instability to material nonlinearity. In this paper, a simple truss element model which is typically used in the stability analysis of thin shells is shown to predict the total load-deflection curve for a restrained slab. The element is formulated with a small initial angle of inclination which is related to the height of the internal arch formed in the slab during early deflections. Solution of the nonlinear equation is accomplished with the Newton-Raphson method. Results of analyses demonstrate a reasonable similarity with recent experimental data.
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