Code Name 
 
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Holizontal
Basic Shear 
V = ZKCIW
where
Z = seismic zone factor
K = framing coefficient
C = seismic force coefficient
I = occupancy importance factor
W = total dead load
For warehouses or storage facilities, W is the total dead load and at
least onefourth of the design live load. For water towers or water tanks,
W is the total dead load and the total weight of the contained water
(e.g., tank completely filled).

Basic Seismic
Coefficient 
The seismic force coefficient C for Taipei (the nation's capital and
principal metropolitan area) is given by
where
T = the fundamental period of vibration
For other regions of the country, C can be determined from

Seismic
Zone
Factor 
Table 1
Seismic Zone Factor (Z)
Seismic
Zone

Zone
Factor Z

W (weak
earthquakes)
M (moderate earthquakes)
S (strong earthquakes)

0.6
0.8
1.0

Fig 1 Seismic map of
Taiwan

Importance
Factor

Table 2
Occupancy importance Factor
I = 1.50

For essential
structures that must remain operational at all times; e.g., fire and
police stations, hospitals, power and watersupply plants, and structures
containing natural gas and gasoline storage facilities.

I = 1.25

For public buildings such as schools, gymnasiums,
museums, galleries, libraries, conference rooms, theaters, ballrooms,
auditoriums, and any other similar structures that may house more than 300
people.

I = 1.00

For all other
structures.


Structural
Performance
Factor 
Table 3
Framing Coefficient
K = 0.67

For
ductile momentresisting frames

K = 0.80

For ductile momentresisting frames with shear walls or lateral bracing
systems, K = 0.80 provided that one of the following conditions is met:
1.
Frames interact with shear walls or lateral braces structurally, and
the total lateral force is resisted by each component proportionally to the
component stillness.
2.
Shear walls or lateral braces function separately from the ductile
frames, but resist the total lateral force.
3.
Ductile frames resist at least onefourth of the total lateral force.

K = 1.33

For
structural systems resisting the lateral force totally by shear walls,

K = 1.00

For structures other than those described above

K = 2.00

For nonstructural systems

I = 2.50

For water towers and water tanks that have crosslateral bracing and are
supported by four or more legs not attached to the structural system (i.e.,
the legs are attached to the ground)
However, in
this case, K times C must not be less than 0.23.

