Standard 90 Degree Hook Rebar

Development length for reinforcement.

Standard 90 degree hook rebar.

Stirrup and tie hooks have a sub definition for 135 degree bends. Either the 90 hook with an extension of 12 bar diameters 12db at the free end or the 180 hook with an extension of 4 bar diameters 4db but not less. 6d d d d d d d d h h detailin g dimension detailin g dimension a or g hoo k a or g hook a or g 6d for 3 4 5 12d for 6 7 8 6d 3 min. Rebar is designed to help provide expansion and contraction support for concrete.

Astm standard reinforcing bars bar size designation nominal dimensions. Therefore certain bends depending on where the rods are to be minimum bend. Twelve single bar specimens and twelve multiple bar specimens each containing either no. Tek 12 6 splices development and standard hooks for concrete masonry ref.

16 bar and smaller 90 degree bend plus 6db extension at free end of bar. When reinforcing bars are bent caution must for the different bar sizes and for the various be exercised to ensure the bends are not too sharp. These bending details are shown if too sharp a bend is put into the bars they may in figure 7 12 there are many different types of crack or be weakened. A stirrup hook is further qualified in 318 11 section 12 13 2 1 as establishing the required anchorage when said hook encloses a longitudinal bar.

Show details of the standard 90 and 180 hooks. Standard hook 180degree ad free. Allowable stress design building codes confinement rein forcement development embedment joint reinforcement reinforcing bars. Specimens 90 and 180 degree standard reinforcing hooks were placed at varying angles to compare the angle of tilt and to compare the two hook types.

The design is based on the reinforcement attaining the yield stress so the reinforcement must be properly bonded to the concrete for a finite length in order not to slip. Details of the standard 90 and 180 hooks specified in sections 7 1 and 7 2 of the aci code. Bent at 90 angle. Construct each framing system has been designed based upon four typical live loads 1 9 kpa 2 4 kpa 2 9 kpa 4 8 kpa and a superimposed dead load of 1 0 kpa.

3 14 12 4d 12 6 keywords. Aci standard hooks for stirrups. This rebar is bent at a 1 ft. The 90 degree hooks with 12 bar diameter extensions are what we usually see drawn in typical details.

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