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control joint in CMU wall

control joint in CMU wall

control joint in CMU wall

(OP)

Normally, at control joint in a cmu wall, specifically control joint a cross a bond beam, it's called out that horizontal reinforcement to be discontinued and dowel into and grease one end.  This is most commonly occur at openings.  But, at the diaphragm level, the bond beam is attached to a continuous angle.  The angle is than  used to transfer cord force.

If the angle is spaning continuously across the control joint, would this inhibit the control joint?

RE: control joint in CMU wall

There is an incompatabilty between the requirements for control joints to limit cracking in the masonry and the need for a continuous bond beam to act as the chord for roof diaphragm action. It has been my practice to keep the reinforcing in the bond beam continuous, as the structural integrity of the building usually depends on it. I then rake out the exterior joint in the bond beam block at the control joint and caulk it with sealant.

RE: control joint in CMU wall

(OP)
Redhead,
The bond beam at the window level, assuming there exist a control joint here, starting the end of the window level bond beam running vertically up to the roof (diaphragm). You would run the reinforcing steel in the bond beam continuously across the control joint at the window level and at the roof level?  Also, you would rake out the exterior mortar and caulk it?

The situation I'm trying to describe has a continuous angle spaning across the top of joist seats.  the joists are pocked into the CMU wall.  The continous angle is anchored into the CMU wall to transfer shear.  If the continous angle span across the control joint and the bond beam, this would inhibit the control joint and incompatible with the bond beam at the window level since the bond beam at the window level has no continuous angle across the control joint.  How can I eleviate this problem?  Thank you for your respond.   



 

RE: control joint in CMU wall

Solution is making the buildings entirely separate by structural joints. All other joints aiming to control expansion and contraction of wall panels may be caulked by sealants, as long as stable by themselves, by reinforcing or any class of bracing in the actual state.

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