Monorail Splice
Monorail Splice
(OP)
Hi,
I am designing a monorail. The total span is 21m.The maximum lifted load is 9MT.The section used is S610. The monorail is simply supported from its top flange at 4 location i.e. each span is 7m and wheels are rolling for the bottom flange of S610.This monorail will be installed outside the building where the temperature difference is about 70 degree C. As per CMAA 74 the maximum gap that rail can have is 1/16".Based on temperature difference my rail will expand about 7.8mm.If I put this as a gap between two sections then I am not satisfying maximum gap restriction of 1/16" as per CMAA. So my questions are:-
1) Can I go for say 8mm gap between the two section and let the wheel to roll over this gap. This monorail will be used only one time in a year for the maintenance of draft tube gates.
2) Can I used slip critical bolts to connect the webs of the sections and maintain a gap of 1/16".If yes, then for what forces these bolts should be checked, other then the longitudinal thrust due lifted load. I will put slot holes in the top flange for the rail(S 610) to expand.
3)What is industry practice to splice the monorail for a temperature difference like this.
Let me know if I am clear.
Regards
Ringoo
I am designing a monorail. The total span is 21m.The maximum lifted load is 9MT.The section used is S610. The monorail is simply supported from its top flange at 4 location i.e. each span is 7m and wheels are rolling for the bottom flange of S610.This monorail will be installed outside the building where the temperature difference is about 70 degree C. As per CMAA 74 the maximum gap that rail can have is 1/16".Based on temperature difference my rail will expand about 7.8mm.If I put this as a gap between two sections then I am not satisfying maximum gap restriction of 1/16" as per CMAA. So my questions are:-
1) Can I go for say 8mm gap between the two section and let the wheel to roll over this gap. This monorail will be used only one time in a year for the maintenance of draft tube gates.
2) Can I used slip critical bolts to connect the webs of the sections and maintain a gap of 1/16".If yes, then for what forces these bolts should be checked, other then the longitudinal thrust due lifted load. I will put slot holes in the top flange for the rail(S 610) to expand.
3)What is industry practice to splice the monorail for a temperature difference like this.
Let me know if I am clear.
Regards
Ringoo






RE: Monorail Splice
Maine EIT, Civil/Structural.
RE: Monorail Splice
RE: Monorail Splice
Cheers
Greg Locock
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RE: Monorail Splice
Provide slotted holes on the outer connections and let all the expansion happen away from the splice.
RE: Monorail Splice
The reason I am not welding is because I haven't got confirmation from the fabricator/contractor that they can weld these two rails together and finally ship to the site, as the site being very remote. But thanks once again for your valuable comment.
Hokie66,
For lateral buckling I am satisfying the clause 3.5.6 of CMAA 74 i.e. computed compressive stress is less than the allowable.
Thanks