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Shear Transfer Under Monotonic Loading, Across an Interface Between Concretes Cast at Different Times.

PB275257

Publication Date	1976
Personal Author	Mattock, A. H.
Page Count	71
Abstract	The total study is concerned with the shear transfer strength of reinforced concrete subject to both single direction and cyclically reversing loading, the latter simulating earthquake conditions. The primary topics studied were the influence of the existence in the shear plane of an interface between concretes cast at different times, and the influence of reinforcing bar diameter on shear transfer across a crack in monolithic reinforced concrete. This Part I of the Final Report is concerned with shear transfer under monotonic, single direction loading, across an interface between concretes cast at different times. Push-off tests were made of both composite and initially cracked monolithic specimens made of normal weight concrete. The interface of the composite specimens was either roughened to comply with Sec. 11.15 of ACI 318-71, or was smooth. In each case, tests were made in which the interface was either bonded and initially cracked, unbonded and initially uncracked, or unbonded and initially cracked. It was found that if the interface was roughened, then the shear transfer strength was very close to that of comparable initially cracked, monolithic push-off specimens, for all interface conditions. If the interface was smooth then the shear transfer strength was much reduced and was approximately equal to the shear yield strength of the reinforcement.
Keywords	Concrete construction Reinforced concrete Shear properties Precast concrete Loads(Forces) Shear strength Cracks Shear transfer Earthquake engineering
Source Agency	Office of Research Directorate
NTIS Subject Category	89G - Construction Materials, Components, & Equipment 89D - Structural Analyses 50C - Construction Equipment, Materials, & Supplies
Corporate Authors	Washington Univ., Seattle. Dept. of Civil Engineering.; National Science Foundation, Washington, D.C.
Supplemental Notes	Structures and Mechanics rept. See also Final rept. (Part 2) dated Jun 77, PB-275 258.
Document Type	Technical Report
Title Note	Final rept. (Part 1) 15 Oct 74-30 Sep 77.
NTIS Issue Number	197806

Shear Transfer Under Monotonic Loading, Across an Interface Between Concretes Cast at Different Times.

Shear Transfer Under Monotonic Loading, Across an Interface Between Concretes Cast at Different Times.
PB275257

Publication Date	1976
Personal Author	Mattock, A. H.
Page Count	71
Abstract	The total study is concerned with the shear transfer strength of reinforced concrete subject to both single direction and cyclically reversing loading, the latter simulating earthquake conditions. The primary topics studied were the influence of the existence in the shear plane of an interface between concretes cast at different times, and the influence of reinforcing bar diameter on shear transfer across a crack in monolithic reinforced concrete. This Part I of the Final Report is concerned with shear transfer under monotonic, single direction loading, across an interface between concretes cast at different times. Push-off tests were made of both composite and initially cracked monolithic specimens made of normal weight concrete. The interface of the composite specimens was either roughened to comply with Sec. 11.15 of ACI 318-71, or was smooth. In each case, tests were made in which the interface was either bonded and initially cracked, unbonded and initially uncracked, or unbonded and initially cracked. It was found that if the interface was roughened, then the shear transfer strength was very close to that of comparable initially cracked, monolithic push-off specimens, for all interface conditions. If the interface was smooth then the shear transfer strength was much reduced and was approximately equal to the shear yield strength of the reinforcement.
Keywords	Concrete construction Reinforced concrete Shear properties Precast concrete Loads(Forces) Shear strength Cracks Shear transfer Earthquake engineering
Source Agency	Office of Research Directorate
NTIS Subject Category	89G - Construction Materials, Components, & Equipment 89D - Structural Analyses 50C - Construction Equipment, Materials, & Supplies
Corporate Authors	Washington Univ., Seattle. Dept. of Civil Engineering.; National Science Foundation, Washington, D.C.
Supplemental Notes	Structures and Mechanics rept. See also Final rept. (Part 2) dated Jun 77, PB-275 258.
Document Type	Technical Report
Title Note	Final rept. (Part 1) 15 Oct 74-30 Sep 77.
NTIS Issue Number	197806