Recent content by flyingdebris

Great work guys. Thanks again

This makes perfect sense. Thanks Ron

hi all, what is the difference in concrete properties whether a 10mm or 20mm aggregate is used?

for a raised old queenslander timber house on steel stumps supporting only by piers (no slab), are you connecting all piers (being concentrated loads) as described in as2870 3.10.1? I know of a lot of engineers that are not doing it and think it is not required. turns a simple house raise into...

Hi Rowing, ignore last post. I have found the relevant formulas.

Im afraid i only have approximately 1.5-2m to bedrock, and maybe not enough depth to achieve this uplift resistance. rowing, where can i find the formula to calculate the uplift force/pressure caused by the soil swelling on a pier? Csnnot find in 2870.

I should add that the house is timber, fully supported on stumps.

can someone point me in the right direction of how to design house piers in E class soils with AS2870? I have heard of people sleeving piers to create a "frictionless" surface between soil and pier to limit movement. Is this essential? Is the other option to make the piers deeper to...

Apology accepted. Please accept mine. Have talked the client out of this anyway. For it's intended purpose it was a silly design. Another win over the architect!!

Thank you to everyone else for giving the question some time for a response. Much appreciated.

Sorry I thought the idea of a forum was indiscriminate no matter the question? But you contradict yourself by saying "IF he is right"? So in fact by stating that, it sounds like you don't know either. If it's as easy as that, that's great, I'm happy. It didn't need a dickhead response from...

Hi Guys, Imagine a simply supported rectangular hollow steel beam which at mid span has been cut in half. One half of the cut beam is sloped down at 15 degrees and would then be full strength butt welded to rejoin the two beams ie the two supports are at different heights (though its not welded...

rowing, understand what you are saying there. i know for sure it happens a lot. i will take your diplomatic answer as a "yes you agree with me".

thanks for input aaron. not keen on lowering waffle slab thicknesses any lower than they are through analysis. they are thin enough. Just trying to do work with the info we are given. it makes perfect logical sense to lower pad depth with step downs. builder telling me he has never done this...

I was under the impression that step downs in waffle pod slabs would also require the pad to be stepped down to maintain a constant beam depth. this is how i see it in the standard details given in as2870. for example, if we have a 385mm deep waffle slab with say an 85mm step down to a corner...