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Cheers! As it's not gonna be an economical design, I liaised with the architect and managed to give a column in the middle, at 20m. Just wondering if you have any experience working on RAM Connection SS3 for moment connections?

hokie66, I can't thank you enough for your kind and helpful replies. You're a star [thumbsup2]

I've attached the STAAD analysis output image. Tahttp://files.engineering.com/getfile.aspx?folder=a456720b-9a40-48ee-a0bc-734b3c96a5a6&file=Portal_Frame_Analysis.JPG

hokie66, you're just fantastic. Thanks a lot for sharing your knowledge with us [thumbsup2] Everyone has been very helpful. Thanks for correcting my maths tony1851 :)

Thanks paddingtongreen. Is there any restriction for frame spacing? For 115m long factory I'm providing 15m spacing between frames so that there will be 10 frames along 115m. In practice, spacing taken by Length/10?

kieran1 and hokie66...thanking you two very much for increasing my knowledge [wink] [thumbsup2]

Regarding the spliced connection at 10m, the rafter would have max bending moment and it's not advisable to splice at this point? Ta!

Thanks to everyone for your replies. So I'll design as 1) Two 10m rafters spliced between the column and apex 2) Brace both sides (at begining and end), giving expansion joints for purlins and side rails at 50m :)

Hello valuable eng-tippers, I'm to design a 40m width, 115 m long and 10m heigh ( 12.25 to roof pitch)portal frame for a factory . I have experience with standard length portal frames using Eurocodes. So I'd really appreciate if you can help me on... 1- Can I use 20m long rafter? Whats the max...