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Title: Fatigue Fracture and Crack Propagation in Concrete Subjected to Tensile Biaxial Stresses

Author(s): K. V. Subramaniam, J. S. Popovics, and S. P. Shah

Publication: Special Publication

Volume: 206


Appears on pages(s): 25-40

Keywords: biaxial, crack, damage, failure, fatigue, fracture, uniaxial

Date: 4/1/2002

The objective of this paper is to characterize the quasi-static and fatigue response of concrete subjected to biaxial stresses in the t-C-T region, where the principal tensile stress is larger in magnitude than the principal compressive stress. An experimental investigaion of material behavior is conducted. The failure of concrete in the stated biaxial region is shown to be a local phenomenon under both quasi-static and fatigue loading, wherin the specimen fails owing to a single crack. The crack propagaion is studied using the principles of fracture mechanics. It is observed that crack growth in constant amplitude fatigue loading is a two-phase processL a deceleration phase followed by an acceleration stage. The quasi-static load envelope is shown to predict the crack length at fatigue failure. A fracture-based fatigue failure criterion is proposed, wherein the fatigue failure can be predicted using the critical mode I stress intesity factor obtained from the quasi-static response. A mnaterial maodel for the damage evolution during fatique loading of concrete in terms of crack propagation is proposed. The model parameters obtained from uniaxial fatigue tests are shown to be sufficient for predicting the biaxial fatigue response.