A NONLINEAR VISCOELASTIC MODEL FOR CONCRETE’S CREEP AND CREEP FAILURE

Abstract eng:
The constitutive behavior of concrete material has always been a prime area of research for many years. In this work a new nonlinear viscoelastic model for the behavior of concrete is presented. The model has the ability to describe concrete’s creep and also creep failure and therefore its failure envelope, as it was obtained by the pioneering experiments of Rusch (1965). The proposed model is an important modification and extension of the “The Modified Kuhn Model of Linear Viscoelasticity”, developed by J. Lubliner and Panoskaltsis (1992). In the present work a non-linear creep function is introduced and equivalently a non-linear evolution equation for its internal variables. The creep function is then appropriately modified to obtain the failure curve of concrete also. The model has been validated against experimental results.

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