Title:
Compression Field Modeling of Reinforced Concrete Subjected to Reversed Loading: Formulation
Author(s):
Daniel Palermo and Frank J. Vecchio
Publication:
Structural Journal
Volume:
100
Issue:
5
Appears on pages(s):
616-625
Keywords:
cracks; load; reinforced concrete.
DOI:
10.14359/12803
Date:
9/1/2003
Abstract:
Constitutive formulations are presented for concrete subjected to reversed cyclic loading consistent with a compression field approach. The proposed models are intended to provide substantial compatibility to nonlinear finite element analysis in the context of smeared rotating cracks in both the compression and tension stress regimes. The formulations are also easily adaptable to a fixed crack approach or an algorithm based on fixed principal stress directions. Features of the modeling include: nonlinear unloading using a Ramberg-Osgood formulation; linear reloading that incorporates degradation in the reloading stiffness based on the amount of strain recovered during the unloading phase; and improved plastic offset formulations. Backbone curves from which unloading paths originate and on which reloading paths terminate are represented by the monotonic response curves and account for compression softening and tension stiffening in the compression and tension regions, respectively. Also presented are formulations for partial unloading and partial reloading.