CHARACTERIZATION OF STRESS SEPARATION RELATION IN CEMENTITIOUS MATERIALS

Abstract eng:
A new approach integrating numerical modeling and experimental work was developed to characterize the stress separation relation in cementitious materials. In this paper, we present the formulation and the algorithm of the numerical modeling. Two weight matrixes, one relates the stresses along the potential crack line to the external loads and the other relates the stresses along the potential crack line to the crack openings, are formed first. The modeling can then be achieved by implementing the stress separation as a boundary condition on the kinetic relation of the stresses, crack opening, and the applied loads. Through a step-by-step iterative process, the relationship between the stresses in the member, load-crack mouth displacement curves, and stress-separation curves can be obtained. Parameter study in exploring the relationship by varying each parameter separately is presented.

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