Debonding of Shear Friction Reinforcement 2

[ENGUCR]

Is it necessary to debond the shear friction reinforcement of the newly casting side of a construction joint of a tie beam???? Does is necessary to provide movement in the new cast??
thanks in advance

 

[hokie66]

If it slips in the concrete, it is not shear friction reinforcement.

 

[ENGUCR]

Thanks hokie66. No movement are allowed. But in sometimes I have seen a debonding to a short extent(say 4 inch) from the interface and thereafter anchorage is provided

 

[hokie66]

You might have to define "tie beam" in order to get good answers for this. I am not sure why a tie beam would require longitudinal movement, nor am I sure how shear friction reinforcement would apply.

 

[ENGUCR]

Sorry I have confused with movement joint with construction joint. No movement at all in long. dirn

 

[JAE]

I think if there is some length of debonding in rebar used in a shear friction joint, you are altering the effective stiffness of the bars to keep the two concrete surfaces in tight contact so you begin to negate the efficiency of the shear friction joint. Similar to what hokie66 stated above - "if it slips it is not shear friction reinforcement" I might add: "if it stretches too much it is not shear friction reinforcement."

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