Characterization of bond in steel-fiber-reinforced cementitious composites under tensile loads

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6946860

Namur, G G

Investigated was bonding in steel fiber reinforced cementitious composites, like fiber-reinforced mortar. The study was basically analytical, consisting primarily of two analytical models that predict the bond shear stress distribution at the interface between the fibers and the matrix, as well as the normal tensile distributions in the fibers and the matrix. The two models were, however, based on separate assumptions. While the first model assumed a known bond shear stress versus slip relationship at the interface between the fibers and the surrounding matrix, the second model was based on a mechanism of force transfer between the fibers and the matrix, hence circumventing the rather complex task of determining the relationship between the bond stress and the slip for the given type of fiber and matrix. Some applications to this second model, such as the bond modulus, the debonding stress, the length of the debonded zone were also investigated. A theoretical study of the pull-out process of steel fibers in cementitious matrices is included. The problem consisted of relating an idealized bond shear stress versus slip relationship to a pull-out curve. The derivation as based on the assumption that this relationship is linearly elastic-perfectly frictional, and then extended to the case of a fiction decaying linearly with the slip. The problem was subdivided into two components: a primal problem, whereby the pull-out curve is predicted from an assumed bond shear stress-slip relationship, and the dual problem, in which an experimentally obtained pull-out curve was used to predict the interfacial constitutive model, namely the bond-slip curve. Model application was illustrated by three examples of pull-out tests. The pull-out curves obtained in the laboratory, which featured the pull-out force versus the end slip of the pull-out fiber, were used to predict bond shear stress-slip relationships.

• Research Organization: Michigan Univ., Ann Arbor, MI (USA)
• OSTI ID: 6946860
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ANALYTICAL SOLUTION
BENCH-SCALE EXPERIMENTS
BONDING
BUILDING MATERIALS
CEMENTS
COMPOSITE MATERIALS
CONCRETES
FABRICATION
FIBERS
FUNCTIONS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
REINFORCED CONCRETE
REINFORCED MATERIALS
SHEAR PROPERTIES
STEELS
STRENGTH FUNCTIONS
TENSILE PROPERTIES