Title: Towards Cyclic Load Modeling of Reinforced Concrete

Author(s): F. J. Vecchio

Publication: Structural Journal

Volume: 96

Issue: 2

Appears on pages(s): 193-202

Keywords: cyclic loads; models; reinforced concrete; shear tests

DOI: 10.14359/610

Date: 3/1/1999

Abstract:
Formulations are presented by which a secant stiffness-based finite element algorithm can be modified to provide analysis capability for arbitrary loading conditions, including reversed cyclic loads. Plastic offset strains are defined for concrete and reinforcement, and these are incorporated into the analysis through the use of prestrain forces. The elastic components of strain are then used to define effective secant stiffness factors. To provide a record of plastic offsets, and of maximum strain experienced during previous loading, strain envelopes are defined using a Mohr’s circle construction. Provisional constitutive models are presented for the concrete, although further work is required in this area. An analysis of a shearwall shows the procedure to be stable and compliant and to provide reasonably accurate simulations of behavior. The results of a pilot series of panel tests are used to identify the aspects of concrete modeling that are in need of further study and refinement.