Design forces in the rebar can be developed by anchorage / lap length in concrete structure.
fully anchorage detail for Shear links
Lap lengths
The lap length for the tension bar should be provision to develop the required stress in the reinforcement. The lap length for unequal size of the rebars may based on smaller size bar lap length.
The lap length for the compression should be atleast 25% grater than the compression anchorage length to develop the required stress in concrete. The lap length for unequal size of the rebars may based on smaller size bar lap length.
Hooks ,bends and bearing lengths.
Minimum bending radius & Anchorage may be govern certain aspects of design. Eg, depth of bearing and choice rebar size for a given thickness of slab. Refer to below table for minimum radius for each size bar and effective anchorage length.
Curtailment of reinforcement
In every flexural members except at end of supports every bar should extent beyond the point which it is no longer needed, this distance at least equal to the grater of effective depth of member or twelve times of the bar size.
In the bar in tension zone, one of the following distance for all arrangements of design ultimate load
a) Anchorage length appropriates to it's design strength (0.87x fy ) from the point at which it is no longer required to resisting the bending moment
b)To the point where the design shear capacity of the section is grater than twice the design shear force at that section
c) To the point where the other bars continuing past that point provide double the area required to resist the design bending moment at that section.
Corbels and nips
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