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Can you use a ridge beam to span the 30ft ? You only need to stiffen the walls and possibly the truss top chord which becomes the rafters.

Thirteen bodies have been pulled from the wreckage of a building under construction that collapsed in a coastal village in India, authorities say. http://m.news24.com/news24/World/News/Death-toll-rises-to-13-in-India-building-collapse-20140104

Concrete in deeper sections (your beam) will settle more than in thin sections (your slab). I agree with hokie66. injection grout it if it will make you sleep better. I just dont like this thin slab and heavy beam system and rebar ratio that can be seen on the photo. The amount of top rebar for...

Patient records / high density filing areas should be clearly shown on plan and designed as such. Probably in the order of 10kPa

I would assume the live loads to be similar to the requirements for hospitals?

Is this perhaps the same beam as mentioned in this post?: http://www.eng-tips.com/viewthread.cfm?qid=344245 No transverse top rebar over those beams?

Is it a slab on grade that is cracking?

860lb is not really something to get excited about. What is the footprint size of these units? I.e. How far are the 4 supports spaced? The 150mm slab on grade should be OK.

http://www.eng-tips.com/threadminder.cfm?pid=802

I would analyse the 24 pile cap (raft?) as a flat slab... What do you have starting on this foundation? A series of columns? Walls/shafts?

Construction workers share details of deadly collapse in Tongaat, Durban, South Africa ALL that mall construction worker Skhumbuzo Ngcobo saw was dust when a concrete slab collapsed in Tongaat, north of Durban, KwaZulu-Natal, on Tuesday, killing a woman and injuring him and at least 28 of his...

Can you not build temporary concrete columns to act as props? I would also think a post tensioned beam is a possible better solution...

This is very very huge. I am interested to know what the application is. Bridge? Is this connected to a column?

Are you replacing the entire slab whilst the freezer store is in operation? Or are you adding to an existing slab? Are there forklifts or other heavy machinery operating on these floors? You will have to consider phasing of work as well as treatment of joints. Also a temperature drawdown...

We have used carbon fibre successfully in rural africa before, so it can be done. I suggest you employ a reputable company to assist with the design. on a side note, why is all the top steel concentrated so heavily within the beam? and also, is there no top steel in the transverse direction...

I do not know what the rebar is, i have only seen the drawings and been to site.

Hi. The slab is actually 270 thick, sorry. Building size about 40x40 m. There is a slab on grade, then suspended parking slab which sits continuously supported on a retaining wall. This slab projects past the footprint of the office above. Some part of the slab will have paving and...

i agree. Tonnage of connections allowed for is usually betw 10-15 %

No salt is added to the roads. Warm summers, moderate rain during winters. never snows. The structure consist of 3 office levels and 1 parking. Conventional reinforced concrete structure. Columns and shear walls. Slab is 280mm thick. Cracks are approx .2mm to .3mm and i was thinking of using...

Hi, I need your opinion on a repair method for the above situation. Do i simply ream the cracks a bit wider with an anglegrinder and apply a trafficable waterproofing paint? With the paint then being applied thicker in the areas of the cracks? Or do i injection grout the cracks and paint over...