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Abstract
The growth of Development techniques for high strength materials and precast structures leads to increase the interesting on these technics. This study will focus on the corbels which made from high strength materials (Reactive Powder Concrete materials) which including the testing of (15 samples) and their cost, twelve of them were testing under a vertical monotonic load, while the other sample putted under the effect of repeated load. As well as, the samples divided to various groups according to many variable parameters which are (ratio of steel fiber, (a/d) ratio, existing the secondary stirrups steel, type of loading). Thus, these parameters effected on the ultimate shear strength, first crack loading, ultimate deflection, load-deflection curves, ductility and stiffness.
Highlights
The precast structures have an important role during reconstruction in all projects, because it is being characterized as: performance quickly and the requirements of executed are easy and available
The behavior of the deflection curve with increasing load was depending on the parameters, where each parameter has an effect on the corbel in a different way due to the difference of material properties and loading condition, (Ihssan, 1993), so the attitude of load-deflection curve was as following: 3.1.1 Effect of Steel Fiber
The first crack and the ultimate shear strength were important in design requirements, (Zielinski and Riogotti, 1995), and from the results it can be seen that the increase steel fiber delayed the occurrence of first cracks with ratio (19.2%- 40%) and increase ultimate load about (43% -97.1%) appearing of secondary reinforcement that increase the ultimate load about (126-144) % but its effect is limited on the first crack
Summary
The precast structures have an important role during reconstruction in all projects, because it is being characterized as: performance quickly and the requirements of executed are easy and available. Corbels structures are useful due their function in the construction field. They should be made from high strength materials because the strength precast structure coming from the strength of the members, (Kriz and Raths, 1965). In general corbels are a level projected and the ratio of shear arm to the depth must be less than 1.0 to called corbels and ACI requirements cover it else called cantilever. Where Corbels after loading to up failure, it can be seen a flexible failure mode in both (tension and compression), may fail as diagonal splitting or shear failure due to horizontal forces (Wight, 2001)
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