Steel Joist Web Reinforcing for Shear
Steel Joist Web Reinforcing for Shear
(OP)
I have a project that calls for the strengthening of existing open web steel joist in a roof for additional loading. The joist is comprised of double angle chords with diagonal rod webs - field measurements are the only information that are available in this case- no tags & no drawings.
Specifically, I am concerned about the shear capacity of rod web members. Can anyone provide a procedure, which they are comfortable with; to determine the shear envelope or capacity for the joists in question (similar to truss design?) that would provide me with the capacity of the joist?
For all methods of strengthening for which I have encountered it has been required to retrieve the ID tag / SJI load capacities for the joist. I understand that when the ID or load capacities are available, the shear & moment capacity envelope is generally easy to find & compare to the new loading conditions. But the info is not available to me in this case.
Thanks.
Specifically, I am concerned about the shear capacity of rod web members. Can anyone provide a procedure, which they are comfortable with; to determine the shear envelope or capacity for the joists in question (similar to truss design?) that would provide me with the capacity of the joist?
For all methods of strengthening for which I have encountered it has been required to retrieve the ID tag / SJI load capacities for the joist. I understand that when the ID or load capacities are available, the shear & moment capacity envelope is generally easy to find & compare to the new loading conditions. But the info is not available to me in this case.
Thanks.





RE: Steel Joist Web Reinforcing for Shear
Go here: http://www.vulcraft.com/downloads.htm
And click on their JOIST Catalog to get a pdf of their catalog which I think contains the spec.
The other thing to worry about is not just the diagonal member capacity (which is just a mini-column with its own KL/r) but the weld that connects the diagonal to the chords. That is the hard thing to verify (size and electrode-wise).
RE: Steel Joist Web Reinforcing for Shear
I would be very surprised if there are no tags available. I have always been able to find tags!
RE: Steel Joist Web Reinforcing for Shear
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