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Stresses shall be calculated as the effect of a force applied horizontally at each floor or roof level above
the foundation. The force shall be assumed to come from any horizontal direction.
(d) Minimum Earthquake Forces for Structure
1. Total lateral force and distribution of lateral forces. Every structure shall be designed and
constructed to withstand minimum lateral seismic forces assumed to act non-currently in the direction of
each of the main axes of the structure in accordance with the following formula:
The value of K shall be not less than that exhibited in Table 2.01-A. The value of C shall be
determined to accordance with the following formula:
TABLE 2.01 - A
HORIZONTAL FORCE FACTOR K FOR BUILDINGS
OR OTHER STRUCTURES 1 TYPE OR ARRANGEMENT OF RESISTING ELEMENTS VALUE OF K2 All building framing systems except as hereinafter classified. 1.00 Buildings with a box system as defined in Section 2.01 (b) 1.33 Buildings with a dual bracing system consisting of a ductile moment
resisting force in accordance with their relative rigidities considering
with the following criteria:
1. The frames and shear walls shall resist the total
lateral force in accordance with their relative rigidities considering
the interaction of the shear walls and frames.
2. The shear walls acting independently of the ductile
moment resisting frames shall resist the total required lateral force.
3. The ductile moment resisting space frame shall have
the capacity to resist not less than 25 per cent of the required
Buildings with a ductile moment resisting space frame designed in
accordance with the following criteria. The ductile moment
resisting space frames shall have the capacity to resist the
total required lateral force.
Elevated tanks plus full contents, on four or more cross-braced legs
and not supported by a building, 3, 4, 5.
Structures other than buildings and other than those set forth
in Table 2.01-B.
1 Where prescribed wind loads produce higher stresses, these loads shall be used in lieu of the loads
resulting from earthquake forces.
2 The coefficient may be modified by the Building Official upon advice of seismologists and
structureal engineers specializing in seismic design.
3 The minimum values of KC shall be 0.12 and the maximum value of KC need not exceed 0.25. 4 For overturning, the factor J as set forth in Section 2.01 (h) shall be 1.00. 5 The torsional requirements of Section 2.01 (g) shall apply.
TABLE 2.01 - B HORIZONTAL FACTOR Cp FOR PARTS OR PORTIONS
OF BUILDINGS OR OTHER STRUCTURES PART OR PORTION OF BUILDINGS
of Force Direction Exterior bearing and non-bearing walls, interior
bearing walls and partitions interior non-bearing
walls and partitions over 3 meters (10 feet) in
height, masonry fences over 1.80 meters (6 feet)
Cantilever parapet and other cantilever walls,
except retaining walls Value of Cp Normal to flat
surface surface 0.20 Normal to flat
1.00 Exterior and interior ornamentations and app...
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- Fall '12