old style open web beam analysis
old style open web beam analysis
(OP)
Hello,
I am doing an analysis of an existing building and need to determine the capacity of an open web beam created by cutting a w-shape lengthwise and splicing two halves back together ( see pic )
Can anyone help me determine the analysis method for these types of beams? Need to place new mech equipment on the floor above and check the floor capacity.
Also, the beam is called out as "18/12 open-web beam." Not sure what is meant by the 18/12.
Thanks
I am doing an analysis of an existing building and need to determine the capacity of an open web beam created by cutting a w-shape lengthwise and splicing two halves back together ( see pic )
Can anyone help me determine the analysis method for these types of beams? Need to place new mech equipment on the floor above and check the floor capacity.
Also, the beam is called out as "18/12 open-web beam." Not sure what is meant by the 18/12.
Thanks






RE: old style open web beam analysis
I would guess that the 18/12 means a 12" beam is cut so that a 18" castellated beam could be made from it.
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: old style open web beam analysis
thread507-15392: Castellated beam design
Just looking at the elevation of your beam, I think the end panels would be the most critical, as the top and bottom "chords" are only 3" deep at that point. You may find that for substantial additional load, filling in the hexagons at the ends would help. I remember that we typically used a longer solid web section near the end.
RE: old style open web beam analysis
New Millennium the steel joist and steel deck suppliers have material on expanded beams although theirs are shapped a little differently.
Jim
RE: old style open web beam analysis
RE: old style open web beam analysis
http://www.cmc.com/en/americas/cmcsteelproducts/Pa...
RE: old style open web beam analysis
Michael.
Timing has a lot to do with the outcome of a rain dance.