Making Neil proud – again
No, I don’t mean I have just bought a shocking pink brad-esque jumper, I am in fact currently wading my way through NA to BS EN 1991-2:2003 in an attempt to calculate the load on a concrete slab that crosses a high pressure gas main to protect it from quarry vehicles.
It’s like calculation bridge loading, only on crack, and redbull, when you’re already as hyper as that bloke who taught us about drawings…
It you’re dealing with “abnormal” vehicle loading, eg. vehicles that aren’t allowed to drive on a road, you have to consider Load Case 3 as described in the EC. Due to the size of the vehicles I am dealing with the NA says I must use SV100 vehicle loading (see below).
My question is, will this always be the most onerous case, in which case do I bother with LC1 or 2 or can I just do LC3 and call it a fish?
Answers on a postcard please…
Holdfast Training Services Trial Blog 
Heelo Guz
I’m afraid I don’t know the anwer. Years ago I load tested a sewer beneth the South Circular and then had to back analyse the results – before we had computers and stuff. I can recall some of it and the results were to do with the compliance of the (egg shaped) structure and the fill (it was Victorian and cut and cover). Any road -the up shot of the stuff that was done at the TRL is now in BS 9295:2010 Guide to the structural design of buried pipelines
Might help.
Hi Guz,
I suspect that this will be too short for full vehicle loading and that you’ll neeed single worst axle loads or a UDL depending upon depth and dispersion. I’m no expert at all on this but have previously used buried mass concrete abutments and slabs to bridge utilites. I’d also stick a duct under neath the slab before it goes in just to give felxibility latr on…
Good idea on the duct.
I have done a cross-section now (hadn’t at the time), i’ll get it scanned and uploaded tomorrow…
Forgot to say a section through would help shed light on this and will be necessary for anlysis anyway. Probably a good thing to have ready for CPR as well.