Cutting Out the Bottom Flange of a Beam
Cutting Out the Bottom Flange of a Beam
(OP)
I have a 25 foot long M14 x 17.2 built in 1965 which interferes with a door and headroom clearance. The owner would like to cut a 4 foot section out for a new door installation. The 3/4 inch thick top cover plated beam is nominally 14 inches deep and with a 7 inch cut from the bottom it would only have a T top section of 7 inches left. Even if I add 2 new tube steel supports and stiffen the remaining thin web with 2 small channels at the the cut portion in the center of the span Ram Advanse calculates large axial forces thruout the entire beam / truss like section. AISC indicates the max bending stress of only 15ksi as this beam is very thin with a high h/t of 65. The uniform load on the beam is 1.5 kip foot from 40 feet of brick work above. Has anyone ever done something, this scary before?? Appreciate any feedback.






RE: Cutting Out the Bottom Flange of a Beam
I would be very concerned about deflection since it supports brick. A 7" beam does not sound sufficient to span 25 feet with a deflection limit of L/600 nor 5/16". Is it possible to install a new beam above and hang and brace the lower remaining beam from above?
RE: Cutting Out the Bottom Flange of a Beam
RE: Cutting Out the Bottom Flange of a Beam
RE: Cutting Out the Bottom Flange of a Beam
RE: Cutting Out the Bottom Flange of a Beam
Ram Advanse with the support restraints marked as all "PINNED" creates this axial force. I removed all the horizontal restraints except for one support and got exactly what I was looking for. Thanks Again.
RE: Cutting Out the Bottom Flange of a Beam
RE: Cutting Out the Bottom Flange of a Beam
How long have you used Ram Advance and how do you like it? I have been looking at it and hadn't talked to anyone who had used it. Please give +'s and -'s if you dont mind.
Thanks