Cutting out web of W-shape Beam
Cutting out web of W-shape Beam
(OP)
Designed a beam for a house to help support the wood floor trusses. A W12x35 runs the length of the house in two sections, with one end of each section connecting to the foundation and the other end connecting to the flange of a W12x22. Now, after installation, he is going through with the HVAC installation. He wants to run it through the web of the W12x22 by cutting out the middle 8" of the web for 12" on one side of the connection and 16" on the other side of the connection. The W12x22 spans 4'-7" (reduced from the 9'-0" from the original design). The W12x35 connects at the midspan of the W12x35.
Now, I determined the moment couple based on the new centroid locations of the reduced T-sections. I determined the allowable compression and shear in the reduced T-section. And according to my analysis, everything checks out that it would be OK to make this modification.
Am I missing something??? because I feel awfully hesitant to give him the green light.
Has anyone else done something like this???
Now, I determined the moment couple based on the new centroid locations of the reduced T-sections. I determined the allowable compression and shear in the reduced T-section. And according to my analysis, everything checks out that it would be OK to make this modification.
Am I missing something??? because I feel awfully hesitant to give him the green light.
Has anyone else done something like this???






RE: Cutting out web of W-shape Beam
RE: Cutting out web of W-shape Beam
RE: Cutting out web of W-shape Beam
Dik
RE: Cutting out web of W-shape Beam
Now, after installation, he is going through with the HVAC installation. He wants to run it through the web of the W12x22 by cutting out the middle 8" of the web for 12" on one side of the connection and 16" on the other side of the connection. The W12x22 spans 4'-7" (reduced from the 9'-0" from the original design). The W12x35 connects at the midspan of the W12x35 (should this read W12x22?).
BA
RE: Cutting out web of W-shape Beam
RE: Cutting out web of W-shape Beam
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Cutting out web of W-shape Beam
To the OP: If you have been retained to solve this, do not be try to be Mr. Nice Guy
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Cutting out web of W-shape Beam
RE: Cutting out web of W-shape Beam
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Cutting out web of W-shape Beam
RE: Cutting out web of W-shape Beam
It appears that the OP has not considered secondary bending on the two T-sections. Cutting of the web as described cannot be permitted.
BA
RE: Cutting out web of W-shape Beam
RE: Cutting out web of W-shape Beam
BA
RE: Cutting out web of W-shape Beam
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Cutting out web of W-shape Beam