UFC 4-023-03
25 January 2005
2-2
COMMON DESIGN REQUIREMENTS.
The following sections present design requirements that are common for all
levels of protection (VLLOP through HLOP), for all new and existing construction.
2-2.1
Effective Column and Wall Height.
For all Levels of Protection, all multistory vertical load-carrying elements must
be capable of supporting the vertical load after the loss of lateral support at any floor
level (i.e., a laterally unsupported length equal to two stories must be used in the design
or analysis). Use the load combination in Section 3-2.4.1 for the design or analysis.
Use the appropriate strength reduction factors and over-strength factors as specified in
Chapters 4 through 8.
2-2.2
Upward Loads on Floors and Slabs.
In each bay and at all floors and the roof, the slab/floor system must be able
to withstand a net upward load of the following magnitude:
1.0 D + 0.5 L
D = Dead load based on self-weight only (kN/m2 or lb/ft2)
where
L = Live load (kN/m2 or lb/ft2)
Note that this load is applied to each bay, one at a time, i.e., the uplift loads
are not applied concurrently to all bays. Design the floor system in each bay and its
connections to the beams, girders, columns, capitals, etc, to carry this load. A load path
from the slab to the foundation for this upward load does not need to be defined. Use
the appropriate strength reduction factors and over-strength factors as specified in
Chapters 4 through 8.
2-7
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