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Section 5
5-193
Base Shear, Vs is calculated as
Vs = W * Sa
Where,
W = Total weight on the structure
Total lateral seismic load, Vs is distributed by the program among
different levels as,
Fx = Cvx * Vs
Where,
Cvx = ( Wx * hxK ) / Σni=1 ( Wx * hxK )
Where,
Wx = Weight at the particular level
hx = Height of that particular level
K = 1.0 when, T ≤ 0.5 sec
= 0.75 + 0.5 * T when, 0.5 < T ≤ 2.5 sec
= 2.0 when, 2.5 < T
General Format
DEFINE COLOMBIAN LOAD
ZON
E f1 ubc-spec
SEL
FWEIGHT
JOI
NT WEIGHT
Joint-list WEI
GHT w
[See Section 5.31.2.2 for complete weight input definition]
ubc-spec = (I f2, S f3)
Where, f1, f2 and f3 are Seismic Risk factor, Soil Site Coefficient
and Coefficient of Importance.