ABSTRACT
The stress-strain diagram of concrete is important for the design of concrete structures because compressive strength, peak deformation, modulus of elasticity and toughness can be obtained from this diagram. However, the stress-strain relationship is not commonly determined in concrete quality control trials, and usually, only compressive strength is determined. However, when more refined methods are used for designing concrete structures, such as physical nonlinear analysis with the finite element method, the stress-strain diagram is fundamental for structure analysis. In this case, the compression strain-strain curve should be determined in a laboratory, even if recommended curves from design codes are used. Thus, the objective of this paper is to propose a methodology to evaluate the compressive strain-strain diagram of plain and steel fiber reinforced concretes using low-cost test machines available in most concrete control laboratories. In addition, a numerical method is presented for inverse analysis of the strain-strain diagram, with the objective of estimating parameters for modeling concrete structures by means of damage mechanics.
Keywords
Concrete; Steel fiber; Stress-strain diagram; Inverse analysis; Numerical modeling
