MindofBarca
Structural
- Mar 7, 2013
- 36
All,
I have a precast client that is looking into ways to optimize the setup of their inverted tee beam process. Currently one of the most labor-intensive processes is stringing each strand through a preassembled cage of stirrups.
The client is asking if they can make the stirrups as opened-legged and even U-bar shaped (for the ledge). Picture attached.
They have also asked if they can add in additional loose bars to overlap/splice the stirrups in after the fact.
I understand if the beam is subjected to torsion this is a hard no (which most of these beams are since there is 12" hollow core on one side and 8" hollow core on the other).
But looking for some more guidance or code criteria on this subject. I dug into the ACI and PCI and did not find any definitive answer.
PCI ledge design Figure 5.5.2 in 7th edition actually shows an open legged stirrup for the ledge. But says "closed ties when required".
Looking for some advice/best practice that I can relay onto the client.
Thanks in advance!
I have a precast client that is looking into ways to optimize the setup of their inverted tee beam process. Currently one of the most labor-intensive processes is stringing each strand through a preassembled cage of stirrups.
The client is asking if they can make the stirrups as opened-legged and even U-bar shaped (for the ledge). Picture attached.
They have also asked if they can add in additional loose bars to overlap/splice the stirrups in after the fact.
I understand if the beam is subjected to torsion this is a hard no (which most of these beams are since there is 12" hollow core on one side and 8" hollow core on the other).
But looking for some more guidance or code criteria on this subject. I dug into the ACI and PCI and did not find any definitive answer.
PCI ledge design Figure 5.5.2 in 7th edition actually shows an open legged stirrup for the ledge. But says "closed ties when required".
Looking for some advice/best practice that I can relay onto the client.
Thanks in advance!
