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Are there any approximate rules of thumb that engineers here use for aluminium RHS members vs steel RHS members with regards to bending capacity? IE a 150 x 100 x 5.0 RHS member has a bending capacity (phi)Msx of 44.00 kNm. Therefore a 150 x 100 x 5.0 aluminium member's capacity would be...

@1503-44, @SSCon. Thank you. And thanks to everyone else too. Appreciate your input. Great reading. Learnt a lot. Had to laugh though I sent them an email Friday to say it's going to be OK only for the bloke on the other end tell me there's going to be a delay for the steel ones and can...

@ jayrod12 Over here it's generally 1500mm before shoring is required although you can go deeper if you bench out 1.5m for every 1.5m you go down. (To a point.) The reason for them asking for certification is these massive mining companies the drillers are working for are hypervigilant when it...

@1503-44 Thank you. I have used the formula and I'm getting a capacity well in excess of the design load. I'd love an opportunity to confirm that via another method as I don't have a 'feel' for what is a realistic value using that formula. IE could be a case of garbage in, garbage out...

The casing has been fabricated in a workshop and taken to site. There's no piling. They are literally dropping it into the hole. It's only 1200 deep. It's landed on my plate because I certify a bunch of other equipment for these blokes and the head contractor has asked the boys on site for...

How do you reply to specific posts? On occasion a worker will have to drop into that hole to do work. I need to know that that casing will not collapse on him due to the surcharge loading. Thanks

Ignore the concrete. There's no quality control out there. We're literally talking middle of a paddock 80 - 100 kms from anywhere. It could be concrete it could be dirt. Forget all the variables and just imagine a casing in a hole with a surcharge loading. That surcharge loading is imparting...

Should I be using Equation 19b?

Probably have been done to death here but after reading numerous threads and googling the hell out of it and consulting Roarks I am none the wiser so here I am. I have a drilling client working out woop woop in Australia. (It's near 'Out to Buggery'.) They will dig a hole some 2.0m x 2.0m and...

Apologies Enable. I misread who your post was directed to. Again thanks to all.

Who's being snarky? I asked a question out of curiosity and you're saying 'Geez wheres my FEA program.' Don't want to help? That's fine. Scroll on.

I realise this is hardly end of the world stuff. I was wondering out of professional curiosity how it's done and/or if there's a formula. Who knows. One day I might have to design some bollards to contain pipes 100ft high.

This forum UI is old skool. Can you quote posts? With regards the above they're only 1100mm high. And there's 3 of them. (It checks out.) Here's a picture which may help.

^^ 3 of 50 x 6.0 SHS post one side. 3 of 75 x 10 flat bar x 2 (side by side with a gap for a lifter) on the other side. I'm in Australia and I wasn't sure what a W8 x 31 was.

Thanks to all. Unfortunately I cannot just specify a giant member and be done with it They have constraints on what we can but irrespective of that I was interested out of professional curiosity as to how this stacked pipes would distribute there load. I've used a combination of methods plus...

The draftsman showed them exactly one over the other one. In reality it'd be (b) as shown above. In which case what is the horizontal component of the dead weight. I've cadded the pipes up in a DWG and if they're touching as shown on (b) then a line drawn from centre of pipe above to centre...

I have a situation where some pipes need to be stacked 7 rows high by 6 pipes across. Each pipe weighs approx 50kg. They're stacked on top of each other. Now if this container held soil or water the loads to the uprights would be easy to calculate but in this case I'm unsure how to proceed...

I do apologise for not responding to your posts. I have been away and only just logged back on. I'll review what is here and I'll post again. Many thanks.

Apologies BA but could you please expand on this. The height differential is not too significant so far as the maximum tension is concerned but it makes a huge difference in the vertical reactions at each end. When considering the load P, the higher support reaction exceeds P while the lower...

Thanks again. I'm note sure how to quote text but "people" was a mistake. Only one person at any given time. Factoring up the person load by 50% still puts me well within the bounds of a 100 kN capacity cable so even allowing for that it seems to be ok. Regards the tension I realise that is...