ACI 318-99 Beam tie requirements
ACI 318-99 Beam tie requirements
(OP)
I have 20 3/4" deep concrete beams. I am in an IBC 2000 jurisdiction. Seismic Use Group III, site class C, design category A (low seismic region). What are the requirements for the concrete beam ties? Can "open top" stirrups be used? If closed ties are required, can they be 2 piece ties? What are the requirements for the two piece ties? Any immediate help is appreciated.





RE: ACI 318-99 Beam tie requirements
For more information on stirrup detailing and design, see the CRSI "Reinforcing Bar Detailing." It gives some excellent examples of beam details.
RE: ACI 318-99 Beam tie requirements
ACI Chapter 7 includes provisions for Structural Integrity where beams with open stirrups require different (more) longitudinal reinforcing to provide continuity in case of a failure of a specific beam.
RE: ACI 318-99 Beam tie requirements
RE: ACI 318-99 Beam tie requirements
Per JedClampett above - check out the CRSI book. Also, ACI has, or had, a good detailing book as well - check their website www.aci-int.org
RE: ACI 318-99 Beam tie requirements
RE: ACI 318-99 Beam tie requirements
RE: ACI 318-99 Beam tie requirements
In most cases, however, engineers do not use compression bars as part of their capacity. There are, perhaps, bars that are in compression in a beam, but the engineer has chosen to ignore them for capacity calculations. These bars, in my opinion, do not require the 7.10.5 ties.
If you have compression bars in your beam (where you are counting on them for strength) then you usually have a condition where your beam is undersized and heavily reinforced, both of which lead to servicability problems as well as higher cost.