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parking sttructure live load

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Actually, the 50 psf can reduce to about 35 psf considering reduction for 
tributary area.  But you also have the 2,000 lb concentrated loads (1604.3, 
1994 UBC) to consider.

If you use the 50 psf/2,000 lb LL, make sure that no commercial vehicles can 
enter the deck.  A two level parking structure that I am familiar with was 
constructed in the side of a hill and access to the upper level was directly 
from the top of the hill.  The owner of the parking structure went ballistic 
when he found out that it wasn't designed to support buses, which was what he 
wanted.  (A lack of communication between the owner, architect and structural 
engineer.)  Barriers were eventually installed so that buses and trucks could 
not enter the deck without the driver *really* knowing about it.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Mvpsc(--nospam--at)aol.com wrote:

>>What is the most commonly used live load for the design of parkiing 
structure or garages with metal deck and steel girders. 50 psf live load per 
UBC seem to be little weak. Any comments?<<