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STAAD Commands and Input Instructions
Section 5
5-276
In the above equations,
A = area of floor supported by the member
R = reduction in percentage
R = rate of reduction equal to 0.08 for floors.
Notes:
1. Only the rules for live load on Floors have been implemented.
The rules for live load on Roofs have not been implemented.
2. Since the medium of application of this method is the FLOOR
LOAD or ONEWAY LOAD feature, and since STAAD
performs load generation on beams only, the rules of the
above-mentioned sections of the code for vertical members
(columns) has not been implemented. The distributed load on
those members found to satisfy the requirements explained in
the code would have a lowered value after the reduction is
applied.
3. Equation (7-2) of UBC 97, (16-3) of IBC 2000 and (16-23) of
IBC 2003 have not been implemented.
4. In the IBC 2000 and 2003 codes, the first note says “A
reduction shall not be permitted in Group A occupancies.” In
STAAD, there is no direct method for conveying to the
program that the occupancy type is Group A. So, it is the
user’s responsibility to ensure that when he/she decides to
utilize the live load reduction feature, the structure satisfies
this requirement. If it does not, then the reduction should not
be applied. STAAD does not check this condition by itself.
5. In the UBC 97 code, the last paragraph of section 1607.5
states that “The live load reduction shall not exceed 40
percent in garages for the storage of private pleasure cars
having a capacity of not more than nine passengers per
vehicle.” Again, there is no method to convey to STAAD that
the structure is a garage for storing private pleasure cars.
Hence, it is the user’s responsibility to ensure that the