Building Design and Construction Handbook - Merritt - Ventech!

5.172 SECTION FIVE
TABLE 5.14 Analysis Procedures for Seismic Design Categories D, E, and F
Structure description
1. Seismic Use Group—1 building of light framed
construction 3 stories or less in height and of
other construction, 2 stories or less in height.
2. Regular structures other than those in Item 1
above, up to 240 ft/in height.
3. Structures that have vertical irregularities of
type 1a, 1b, 2, or 3 in Table 5.13, or plan
irregularities of type 1a or 1b of Table 5.12,
and have a height exceeding 5 stories or 65 ft
and structures exceeding 240 ft in height.
4. Other structures designated as having plan or
vertical irregularities
5. Structures with all of the following
characteristics:
• located in an area with S D1 of 0.2 or greater
• located in an area assigned to Site Class E or
F
• with a natural period T of 0.7 seconds or
greater, as determined in equivalent lateral
force procedure
Minimum allowance analysis
procedure for seismic design
Simplified procedure
Equivalent lateral force procedure
Model analysis procedure
Equivalent lateral force procedure
with dynamic characteristics
included in the analytical
model
Model analysis procedure. A sitespecific
response spectrum shall
be used but the design base
shear shall not be less than that
determined from simplified
procedure
period (S S) and at 1-second period (S 1) and they need to be adjusted for site class
effects, by site coefficient F a and F v. (See Tables 5.15 and 5.16.)
The corresponding design spectral response accelerations at short periods and at
1 second are:
2
SDS � FS a a
3
(5.309)
2
SD1 � FS v 1
3
(5.310)
The general design response spectrum curve is developed as Fig. 5.113, in which
T � 0.2
0
T �
S
SD1 SDS SD1 SDS and T is the fundamental period (in seconds) of the structure.