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Great thanks for the feedback...will check them out.

Hi All, ACI 376-11 in Clause 11.4.4.2 calls for a full-scale grouting test for PT Tendons. We have a LNG tank 46m high and would need to do a full-scale test (46m high) by building a mock-up sample and grouting it to satisfy code and spec. (140mm duct with 27 strand tendon). It seems a...

Yeah, I'm talking about varying the bearing height at each support. These are long spans (12m) and the topping would be too heavy over that distance if tapered.

has anyone designed a hollow core roof with the planks laid to a fall to minimize weight and to keep the topping a constant thickness?

Hi Has anyone had any success and know how in casting a concrete slab in a multistory garage with a slope for drainage (1:60)? We have large areas and want to avoid screeds (and a disaster). Regards Newbie

Gents, When does IBC 2012 come into effect? Is IBC 2009 immwediately withdrawn. The reason I am asking is that I'm working overseas on a contract that mentions ibc 2009, but in the same breadth mentions the latest versions of codes are to be used at the time the contract is signed. Regards...

Thanks for the replies. Do your answers change if the links are also required as binders to stop compression reinforcement from buckling? NB

Dear All, In BS 8110 pt 1 clause 3.8.12.6a the code describes anchorage of shear links having a 90 degree bend of certain dimension. Is it permissible to use such a 90 degree anchor (i.e. a U shaped link) at each end of the link. Or, as the standard methods of detailing decribe must we use a...

Thanks to all of you for your "prompt" replies. I originally posted the query 5 years ago. Since then we have built approximately 146,000m2 of residential and hotel accomodation using steel formwork. My experience has shown that it is better to use the spatter coat, although occasionally e can...

Where I live all the fire escape stairs are concrete. I have noticed that in the US most escape stairs are made from steel. How do you justify the cost of steel stair and applied fire protection? Or do you have another technique to avoid fire protecting the metal? Newbuilder

Hello, I have a very complex suretrak network for a building. I periodically enter the progress as a percentage of each activity. Is there any way the program will calucate the number of days or behind schedule a particular activity is? Regards, Newbuilder

Thank you for your reply

If I design a portal frame with a footing under each column, then I can check the global stability against overturning by providing a suitable footing mass under each column. The same frame is designed as being fixed at the base, i.e. a moment is transferred to each footing. Does this footing...

Nearly every beam detail I've seen anchors the top reinforcement at the support "downwards" into a column or wall. This often occurs with the bottom bars too. However, the contractors will cast the walls and columns to the soffit of the beam (and slabs). To avoid uneven construction...

Thanks for the tips. NB

We have large stainless steel door subframe to be fixed to a rc frame. The detail calls for some kind of cast in fixing (which was not cast-in). The fabricator says that it is common to drill and grout some steel rebar dowels then weld them to the ss frame. Is this normal? Can ms and ss be...

With reference to BS 8110 cl 3.12.8.13 Should the factors of 1.4 or 2 be applied to wall and column reinforcement? Is the wall or column surface "the top of section as cast"? NB

Big help thanks NB

The Engineer has requested that we perform a safety test on our window design of 25% over the design load. There are several issues of concern: the test is uncommon locally, though testing to the design load is common. the supplier is quite uncertain about success our design load is 6.9kPa so...

What is the correct technical term for the type of tie used in water tanks that does not leave a through hole in the structure. NB