Title:
Constitutive Modeling Including Multiaxial Testing for Plain Concrete Under Low Confining Pressure
Author(s):
M. R. Salami and C. S. Desai
Publication:
Materials Journal
Volume:
87
Issue:
3
Appears on pages(s):
228-236
Keywords:
compression; deformation; loads (forces); mathematical models; plain concrete; plastic theory; stresses; stress-strain relationships; tensile strength; tests; yield point; Materials Research
DOI:
10.14359/2168
Date:
5/1/1990
Abstract:
Characterization of stress-deformation behavior of plain concrete has been a subject of active research for a long time. Linear elastic, nonlinear (piecewise linear) elastic, elastic-plastic and endochronic models have been proposed and used by various investigators, and the range of literature on subjects is very wide. A review of various models, together with their implementation in numerical (finite element) procedures is presented in the references to the paper. A generalized constitutive model based on the theory of plasticity is proposed to characterize stress-deformation behavior of concrete. It allows for factors such as hardening, volume changes, stress paths, cohesive and tensile strengths, and variation of yield behavior with mean pressure. The constants for the model are determined from a comprehensive series of laboratory tests under different initial confinements and stress paths by using a multiaxial testing device. The model is verified with respect to laboratory tests used for finding the constants and complex stress path tests not used for finding the constants. Overall, the proposed model involves a fewer or equal number of constants compared to available models of similar capabilities and is easier to implement in (numerical) solution procedures. The proposed procedure can provide an alternative and generalized, yet simplified, approach for developing constitutive models for plain concrete.