Jhinnie2
Structural
- Sep 28, 2021
- 9
Hi All,
New here, just looking at a problem for installing a panel board to existing steelwork. Need some ideas for the connection of the board which looks to have a Unistrut with a 11 mm diam bolt hole, to two 75x6 EA legs. The legs will bolt to the exisiting steel work (150PFC) via baseplate with some small moment capacity. I have done the checks and EAs are okay since its minimal load, and bolts are eccentric to take moment, base plate is 12 mm thick GR250, nominated M12 or M16 8.8/S bolts, EA and PFC are GR300. Looked at self weight of panel and an imposed lateral load based on AS 1170.1 of 1.5 kN in any direction. Frame is inside so no wind loads. I don't have any lateral ties between the two 'cantilever' legs since I figured the panel is so light 35 - 50 kg and the panel will probably stiffen the legs and create a bit of portal action.
So I think everything looks OK, but just not sure about the top connection how it will bolt to the Equal Angle toe, so if someone has an idea for the detail and whether a bolt for an 11 mm diam hole will be able to carry the load please help! I've never used Unistruts before, I've only really seen them on electical cable trays. The toes can go either direction, I just put one toe more inline with the panel edge for better load transfer.
Attached a sketch with some calcs and geometry for reference -
Thanks in advance!
New here, just looking at a problem for installing a panel board to existing steelwork. Need some ideas for the connection of the board which looks to have a Unistrut with a 11 mm diam bolt hole, to two 75x6 EA legs. The legs will bolt to the exisiting steel work (150PFC) via baseplate with some small moment capacity. I have done the checks and EAs are okay since its minimal load, and bolts are eccentric to take moment, base plate is 12 mm thick GR250, nominated M12 or M16 8.8/S bolts, EA and PFC are GR300. Looked at self weight of panel and an imposed lateral load based on AS 1170.1 of 1.5 kN in any direction. Frame is inside so no wind loads. I don't have any lateral ties between the two 'cantilever' legs since I figured the panel is so light 35 - 50 kg and the panel will probably stiffen the legs and create a bit of portal action.
So I think everything looks OK, but just not sure about the top connection how it will bolt to the Equal Angle toe, so if someone has an idea for the detail and whether a bolt for an 11 mm diam hole will be able to carry the load please help! I've never used Unistruts before, I've only really seen them on electical cable trays. The toes can go either direction, I just put one toe more inline with the panel edge for better load transfer.
Attached a sketch with some calcs and geometry for reference -
Thanks in advance!
