Nulukkizdin
Structural
Working through a retrofit of an (E) steel fabrication building. The original building sports a 20T crane that runs along rails supported at 20'-0" OC. In the proposed retrofit, the architect is showing two of those columns being removed, creating a 60'-0" span over which the crane will continue to run.
That said, I'm looking to design a (N) steel beam that will support the crane rail over this new span. In doing so, I'm curious as to what type of deflection limits I need to hold my design to. I'm assuming there will be not only a L/___ limit but also a maximum allowable deflection number?
Similarly, due to the requirements of ASCE7-10 4.9.4, I'm putting 20% of the vertical load as a lateral force perpendicular to the beam. Two questions on this:
1) My original assumption is that this lateral force should be applied IN ADDITION TO the vertical load on the crane, is this correct?
2) Similar to my question above, what kind of deflection limits should be imposed on the out of plane loading case?
Thanks!
That said, I'm looking to design a (N) steel beam that will support the crane rail over this new span. In doing so, I'm curious as to what type of deflection limits I need to hold my design to. I'm assuming there will be not only a L/___ limit but also a maximum allowable deflection number?
Similarly, due to the requirements of ASCE7-10 4.9.4, I'm putting 20% of the vertical load as a lateral force perpendicular to the beam. Two questions on this:
1) My original assumption is that this lateral force should be applied IN ADDITION TO the vertical load on the crane, is this correct?
2) Similar to my question above, what kind of deflection limits should be imposed on the out of plane loading case?
Thanks!