Steel roof joist modification

[BSE05]

I have a situation where a roof deck (100 psf LL) is being added above a 40' span of open web steel roof joist. To get additional load capacity our plan is to add a center support to the joist to increase load capacity. The center will be modified to provide for "end" bearing. All diagonals and angles are of consistent size throughout the length of the joist.

Anyone done this before? Any advice or cautions?

Thanks.

 

[frv]

I assume people can congregate on the roof?

Otherwise, 100 PSF seems pretty high.

 

[JAE]

Try these two similar threads:

thread1066-195606

thread507-6993

 

[JAE]

And another one:

thread1066-113062

 

[BSE05]

100 psf is code here in MA. JAE Did you do a thread search I tried that and got nothing?

 

[BSE05]

JAE thanks for the replies great info.

Lee B.

 

[JAE]

SteelyLee - yes - use the Google search on the right at the top of each page. The Eng-Tips search engine works, but is still under development I believe. For now the google search is the way to go.