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Tony,
 
ASCE had a document on construction loads and temporary / erection stability.  I do not recall the exact name, but you could search the ASCE website.
 
Otherwise, I do not see your problem.  The engineer responsible for the lower level is advising you to re-shore (prop) two levels to accommodate the construction loads, then you re-shore two levels.  The cost impact cannot possibly be significant on the construction of a 33 story project.  We routinely re-shore two levels as the table tops are moved up for new deck construction in multi-story buildings.
 
With regard to proper construction loads, you should be able to estimate your material dead loads fairly easily, assume a minimum 20 psf additional live load (more if material stacks and equipment will be moving around), and apply a fair degree of safety factors.  You do not want to have to explain to a child why her father is dead.
 
Paul Feather
----- Original Message -----
From: tony
Sent: Tuesday, August 28, 2001 7:13 PM

Hi there
 
I am a structural engineer from Malaysia and working in Kuala Lumpur. I am working on a 33 storey apartment building. I would appreciate very much if someone can give me some advice on this problem I am having.
 
The company which I am with is the contractor for the building superstructure. The basement (3 levels of carpark) was built by a another contractor. We are about to start construction of the Mezzanine floor. However, the consultant engineer requires us to provide propping for at least 2 floors for construction of the new floor.
The reason given is that the carpark which is designed for 2.50KN/m2 imposed load cannot take the load from the new floor transferred via scaffold. The new floor slab is 125mm thick spanning 2.7m across supporting beams (700x230).
 
As far as I have seen, all the construction in Malaysia is done by only propping one level (unless it is heavy structure). Yet, design calculations proves otherwise.
Can you let me know the reference (British Standards or equivalent) where I can get the construction load for temporary works.
 
Thank you
 
Tony