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Does anybody have any experience of using proprietary concretes for structural or non structural purposes? We use CESWI as the basis of our specification, which refers to the standard cement blends (OPC, CEM I, CEM II etc.), typically used in a designed or designated mix. We've been looking...

What value are you getting for the factor which takes into account height above sea level?

Thanks for replying BA. I'm trying to avoid a piled solution, mainly because of access problems (everything has to cme through a gate at the side of the house), and frankly I'm trying to keep the cost down as well. I thought the bearing pressures would be so low under the raft that I may not...

I am looking to design a single story extention (approx 3m x 4.5m) on the back of my house and wanted a bit of guidence from those of you who have done this sort of thing before (preferably in the UK). My background is mainly in bridge design working for large consultants, so typically will have...

Thanks Qshake, Precast panels with an in-situ topping have been proposed, so this sounds like a pretty standard case. We have a concrete barrier/parapet/railing on the stringcourse/cantilever/overhang, so I guess this will govern the design. RME1

Hi, I'm looking at designing the deck slab for a fairly routine, simply supported, multigirder bridge deck. Being from the UK, I have not used AASHTO before and have a quick question regarding the anaysis. Ordinarily, I would look at the global effects of differential deflection of the beams...

Does anyone know what brdige design codes are used in the UAE, particularly Abu Dhabi? BS5400, AASHTO, Eurocodes? Thanks

I've had a request from a fabricator to include some ties between pairs of braced girders as they are concerned about tolerances on straighness which could affect the placing of the permanent formwork panels. They reference table 8 in 5400-6, but I'm having trouble determining the tolerances...

I am in the process of preparing a departure for the use of resin fixed reinforcement. I have been predominately looking at Hilti HIT-RE-500 system. The job involves breaking out the back face of a small wingwall, resin fixing some bars into the abutment, then recasting the back of the wingwall...

Anyone have any experiance designing resin fixed bars using Hilti HIT-HY-150 system or Hilti HIT-RE-500 system with the Hilti Fastening Technology Manual? I have a few queries if anybody has.

Thanks for your response Valleyboy. First of all, let me clear up that I wasn't being derogatory about buildings by suggesting that designs were simpler. What I meant was that from speaking to engineers that have done both there is a lot more emphasis on programme in the buildings sector. With...

Do they actually call it a Royale in France? It's still a quarter pounder in England. Apparently they're going to stop selling beer in pints over here as well, so that we're in line with the rest of Europe. Anyway, I feel we've digressed... I might just jack bridges in and be a team leader at...

Ha ha swivel63, I'm in the UK so I won't design a 4' anything. We've got something called a 'metric system' ;)

Has anyone on here made the switch from being a Highway Structures (ie Bridges) Engineer to a Building Structures Engineer? It's something I'm considering at the moment, and wanted to get an idea of the differences between the two and how easy it is to switch. I have about 5 years...

Well I wanted to avoid reconstructing the whole wingwall if possible, so we tried a few different methods to try to get a favourable result. This might not sound like the correct way to go about things, but it was a case of knowing that this huge lump of concrete wasn't going to go anywhere, but...

In the UK, you are required to consider integral abutments for any span <60m (if HA is the client). Over 60m you are free to put in expansion joints if you wish, but I have seen integral bridges up to 100m. Over 60m I think you need pretty large abutments to withstand the expansion forces. If...

Dave, you're right there is a movement joint between the deck and the wingwall. The solution we have eventually come up with invovles determining the point on the wingwall where the tensile stress in the mass concrete is <1N/mm2. This was done using a combination of pucher charts and 45 degrees...

Hi, I am doing a parapet replacement job in the UK, which involves breaking out the existing edge cantilever and recasting it with more rebar to increase the capacity. On the deck this is not a problem as the new rebar can just be lapped onto the existing bars to tie it into the rest of the...

Thanks for your response. Most of examples I've seen have a vertical plate welded accross the ends of the girders, with shear studs on the other side going into the end block. I'm not sure if this is just a 'good practice' detail or if there are any design calculations behind it. Did you include...

Hi, I am designing a semi integral bridge in the UK. It is a 2 span bridge (both spans approx 30m), with fixed bearings at the central pier and free bearings at the abutments to allow for expansion. The deck is continuous steel plate girder with a RC deck slab. At the ends of the bridge the...