Adding load to bottom chord of steel truss
Adding load to bottom chord of steel truss
(OP)
I have been asked if a rack system can be hung from the bottom chord of a steel truss. The existing steel trusses are space 5' o.c. and the rack would attached to two of them. The trusses span 50' and are supported by two 24" steel I-beams. How would I determine how much load can be supported by the steel trusses? Is it even practical to add loads to the bottom chord of steel trusses? I have attached a picture and the red lines are where they would like to install the supports and the rack would hang from these supports.






RE: Adding load to bottom chord of steel truss
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Adding load to bottom chord of steel truss
RE: Adding load to bottom chord of steel truss
RE: Adding load to bottom chord of steel truss
RE: Adding load to bottom chord of steel truss
RE: Adding load to bottom chord of steel truss
RE: Adding load to bottom chord of steel truss
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Adding load to bottom chord of steel truss
You may want or need to add vertical members (welded between chords).
For light loads......should not be any problem unless original design was deficient.
Also check deflection.
Especially for low-slope ("flat") roof and heavier loads (but even for any loads considering liability these days).........be sure to check potential for ponding failure. You may find that original design is deficient for ponding.......in which case, you should inform owner at the very least and perhaps recommend additional ("secondary" or "overflow") drains if necessary.
John F Mann, PE
www.structural101.com