Help with codes for monorail certification 1

[bridge_dreamer]

Hello all,

I am a new structural engineer and this is my first post here, so thank you for any guidance you can provide.

At work, I am currently certifying the capacity of various S-shape monorails being used to move large machinery. For the most part, I have been able to do this easily through tables in a design guide. However, some rails cantilever outside of the building, and I don't believe my design guide covers this scenario.

I intend to first certify the simply supported span of the rail by the design guide, then check the cantilever portion manually. However, I'm not sure what all procedures I need to use. The rails are supported by bolts through the top flange into floor beams or struts, and some are cantilevered completely unbraced while others do have a diagonal kicker connected to the web.

I have yet to become fully adept with the structural steel manual so I'm wondering if there is a specification that can cover this scenario. Any suggestions or code callouts (I have access to the 8th, 14th, and 15th edition) are much appreciated.

 

[SKJ25POL]

Please send me couple pics of what you are trying to certify and I will direct you.
I do same job all times.

 

[bridge_dreamer]

Here are a couple examples. I am aware the one beam is damaged and needs repair.

 

[sbisteel]

If this is in the states, CMAA number 74 would be a required spec.

 

[SKJ25POL]

bridge_dreamer (Structural)(OP)
What industry these pictures are in?
You also need to know what load/object they intend to lift by the monorail and what's the load weight range.
How old are these monorails? Any information when they were installed?
The second picture shows a dented kicker. Is the second pic same monorail in first pic?
How many supports are there? Is it a one span and cantilever portion?
Visually check if the supports are in okay condition.

 

[bridge_dreamer]

This is a cement processing plant. I have anticipated loads for what they want to lift (motors, reducers, etc), which is what I'm verifying the rails for. They were installed around 1955. The pictures are two different rails. In general, the rails are one span with a support at either end, with an overhang beyond one of the supports. In the first pic, the rails extends 6 feet beyond the building. In the second pic, 10 feet beyond the building. I just need assistance determining the stability of the overhangs. As stated before, one is completely unbraced at the end, the first pic. And one has a kicker as shown in the second pic (kicker will be repaired).

 

[FLCraneBuilder]

1) CMAA 74 does not cover monorails - only single girder cranes. However, it may be worth a look, particularly for flange loading
2) By the looks of the system, it may have been designed & installed at time of original building design. If so, the original construction documents would help
3) Are you tasked with looking at the beams only, or the entire structural system? - all the way to the roof trusses?
4) Why do you need a code to do this? - what information do you see from a code?
if deflection criteria, I wouldn't trust a code - the push-pull trolley will roll down hill on the cantelver if the common L/450 for vertical is used - engineering judgment must be applied, If you need stress criteria, 60% of yield is common in monorails & most structures. Run the calcs & consider the results
if you need to know how to runway the calcs, that's not a code item

MMA (monorail manufacturers association) is one of the more common authorities on this topic