Adding Stirrups
Adding Stirrups
(OP)
A contractor got creative with one of my designs and some stirrups were omitted.
Is it possible to drill & epoxy #3 vertical rods into the beam? Does the stirrup leg still need to hook around the tension reinforcement per ACI 318-99 11.5.1.2?
I doubt if this would be practical to do in the same plane as the existing stirrups since I would worry about drilling bars so close to the face of the beam. Perhaps they can be drilled inside the longitundinal steel and hooked over the top.
I have seen steel straping used for this problem but this is a grade beam so I would be worried about corrosion unless I used stainless steel.
Any other ideas?
Is it possible to drill & epoxy #3 vertical rods into the beam? Does the stirrup leg still need to hook around the tension reinforcement per ACI 318-99 11.5.1.2?
I doubt if this would be practical to do in the same plane as the existing stirrups since I would worry about drilling bars so close to the face of the beam. Perhaps they can be drilled inside the longitundinal steel and hooked over the top.
I have seen steel straping used for this problem but this is a grade beam so I would be worried about corrosion unless I used stainless steel.
Any other ideas?






RE: Adding Stirrups
RE: Adding Stirrups
The first thing to do is re-verify your calculations and eliminate any sluff / extra loads you put on the beam that really won't occur. Next take a look at the f'c that you get from the test results since shear is very dependent on f'c.
You could possibly drill down and use a bolted end to a top cap plate but that sounds really difficult to do - lots of drilling = lots of money.
I'd agree that exterior strapping would be subject to corrosion and boo1's suggestion might be workable - but its usually expensive also - and takes time to get the sub-contractor specialist in to do it.
Perhaps some strategic underpinning with additional supports to minimize shear?
Or perhaps an adjacent grade beam on the inside to add strength and span from the same supports.
RE: Adding Stirrups
RE: Adding Stirrups
RE: Adding Stirrups
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RE: Adding Stirrups
RE: Adding Stirrups
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www.phoenix-engineer.com