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See detailBehavior of Deep Beams with Large Headed Bars
Mihaylov, Boyan ULg; Bentz, Evan; Collins, Michael

in ACI Structural Journal (2013), 110(6), 1013-1022

While anchor heads are particularly useful in the case of large bars which require significant development lengths, the ACI code provides design guidance for bars #11 or smaller. This paper presents a ... [more ▼]

While anchor heads are particularly useful in the case of large bars which require significant development lengths, the ACI code provides design guidance for bars #11 or smaller. This paper presents a test of a large deep beam reinforced with a single #18 headed bar. The behavior of the beam is evaluated in comparison to the behavior of a specimen with more conventional reinforcement of 6#8 headed bars, and to the behavior of a specimen with lap-spliced anchor hooks. Despite the extreme detailing of the specimen with a single #18 bar, the beam had the same strength as the specimen with 6#8 bars. The compressive stress in front of the anchor head reached about 1.5 times the compressive strength of the concrete and the stress in the #18 bar reached about 414 MPa (60 ksi) before the beam failed in shear along a diagonal crack away from the anchorage zone. Shear strength calculations according to Appendix A of the ACI code showed that the current strut-and-tie provisions can overestimate the shear strength of deep beams by as much as 23%. [less ▲]

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See detailTwo-Parameter Kinematic Theory for Shear Behavior of Deep Beams
Mihaylov, Boyan ULg; Bentz, Evan; Collins, Michael

in ACI Structural Journal (2013), 110(3), 447-455

This paper presents a kinematic model for deep beams capable of describing the deformed shape of such members in terms of just two primary parameters. The kinematic model is combined with equilibrium ... [more ▼]

This paper presents a kinematic model for deep beams capable of describing the deformed shape of such members in terms of just two primary parameters. The kinematic model is combined with equilibrium equations and stress-strain relationships to form a theory to predict the shear strength and deformations patterns of deep beams at shear failure. These deformation patterns include crack widths, maximum deflections, and the complete displacement field for the beam. The kinematic theory predicts the components of shear strength of deep beams and how they vary with a/d ratio. These components indicate a significant size effect for the shear strength of deep beams even for members with transverse reinforcement. The theory has been validated against a large number of experimental results. [less ▲]

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See detailBehavior of Large Deep Beams Subjected to Monotonic and Reversed Cyclic Shear
Mihaylov, Boyan ULg; Bentz, Evan; Collins, Michael

in ACI Structural Journal (2010), 107(6), 726-734

An experimental study on eight large reinforced concrete deep beams was performed. The variables were the shear-span-to-depth ratio (a/d = 1.55 or 2.29), quantity of stirrups (0.0 or 0.1%) and type of ... [more ▼]

An experimental study on eight large reinforced concrete deep beams was performed. The variables were the shear-span-to-depth ratio (a/d = 1.55 or 2.29), quantity of stirrups (0.0 or 0.1%) and type of loading (monotonic or fully reversed cyclic). All members failed in shear before yielding of the longitudinal reinforcement. The provision of only 0.1% of transverse reinforcement significantly decreased crack widths at service load levels and significantly increased the shear strength. For members with stirrups, the load-deformation response measured under monotonic loading provided an excellent envelope to the cyclic response and the shear strength under reversed cyclic loading was not significantly reduced. For the members without stirrups, somewhat surprisingly, those tested under reversed cyclic loading failed at significantly higher shear forces than their companion monotonically loaded specimens. [less ▲]

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See detailCalculation Method for Design of Reinforced Concrete Columns under Fire Conditions
Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg; Vanderzeipen, Yves

in ACI Structural Journal (1999), 96(1), 9-18

This paper presents a simple model for the calculation of the fire resistance of reinforced concrete columns. It has been developed on the base of extensive numerical simulations and has been calibrated ... [more ▼]

This paper presents a simple model for the calculation of the fire resistance of reinforced concrete columns. It has been developed on the base of extensive numerical simulations and has been calibrated on the base of a large data base of full scale experimental test results [less ▲]

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