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AS3600 development of stresses around a bend
2

AS3600 development of stresses around a bend

AS3600 development of stresses around a bend

(OP)
In AS3600, there is s clause which stipulates that in order to enable stress development around the curve of  a reinforcing bar, the internal diameter of the curve must be greater than 10 x the diameter of the bar.  Does anyone know where this come from ?  I suspect this is something to do with bearing stress of the steel acting on the concrete at the bend.  Is a 10 d_b curve sufficient to prevent bearing failure when the bar is fully stressed in tension ?
 

RE: AS3600 development of stresses around a bend

Development and splice lengths have had a large experimental component and one can have, always talking relatively, more confidence on what about such thing said than about so many others in the structural design field. Part of the success comes of the pull test being easy to implement and being repeated great number of times for the many deformed bar patterns that compete in the market.

I have made a small all bonded steel and concrete model to see the stresses and results that the tensile stresses are worst where spall would be expected on the bent bar. On the other hand crushing stresses at the curve remain well within the capacity of the concrete.

It is also worth to mention how full bond -as in the model- resolves the force to manageable tensile stresses in the concrete in a very short length of bar.

RE: AS3600 development of stresses around a bend

kww2088,

Yes, that is the logic! I assume it is based on tests.

If you can get a copy of the British Code, BS8110, clause 3.12.8.23-25 gives more detailed rules on this including calculations for the bearing stress in bends and allowable values.

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