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Reinforcing Existing Beam[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org, Rehan.Nawab(--nospam--at)fluordaniel.com, structx(--nospam--at)mlists.net
- Subject: Reinforcing Existing Beam
- From: Rehan.Nawab(--nospam--at)fluordaniel.com
- Date: Sat, 13 Mar 1999 09:56:37 -0500
Folks, I am in a situation, where I have to reinforce an existing beam (18B40) while it is still carrying load. The client requirement does not allow for welding cover plates. Therefore, I am opting to add a new WF beam to the existing beam using 3/4" A325 bolts. This existing beam has full lateral support, i.e. Fb = 24 ksi. This existing beam under existing loads is stressed to 18 ksi. This only allows for approximately 6 ksi (18+6=24 ksi) after adding the new beam. Since, the new loads are heavy, this requires a very large composite section modulus to keep the stress around 6 ksi. In, this case W33x201 attached to 18B40. Is this approach overly conservative? Is there any other way you would analyze the problem? Existing beam is up-high and I don't think, I can have the beam jacked-up to unload the existing stress in the beam. Existing Moment = 100 ft-kip Combined Existing and New Moment = 385 ft-kip Composite Section Design Moment = 285 ft-kip Composite Section Modulus = 611 in3 Any ideas? Thanks in advance. Rehan Nawab, P.E. P.S. I posted this question yesterday, but it appears it got missed some how.
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