Beam Construction Joints
Beam Construction Joints
(OP)
I have seen typical details from a few firms that show "X" shaped rebar passing through a construction joint. Usually this consists of 2 "S" shaped bars crossing each other at mid-height.
What is the engineering reason for doing this?
What is the engineering reason for doing this?






RE: Beam Construction Joints
RE: Beam Construction Joints
http://12.139.234.2/project_docs/docs/ELAC/Old%20D...
RE: Beam Construction Joints
RE: Beam Construction Joints
Think of this this way: What better way to ensure you know EXACTLY where a hinge will form than to place a bond-broken tension section and extra "focussing" bars where your modelling tells you hinges are likely to form.
RE: Beam Construction Joints
RE: Beam Construction Joints
RE: Beam Construction Joints
In the case of a seismic hinge, it is the fact that there are fewer bars in the zone which can be used to increase the likelihood of hinge formation where you want.... The X-bars should extend into the primary steel in such a case, and the locations of the hinges should be clearly spelled out on the plans. Neigther being the case here.
I think I'm wrong, and misjudged the detail due to past experience. *sigh* I'll try to save what face I can by pointing out that a very similar detail can be used seismically, but would not find a place in a shear wall building in any case.