1-in = 25.4mm

1-ft = 0.30m

1plf = 14.58KN/m

Figure J2-2. Platform framing plan

A.1 *Determine appropriate Seismic Use Group*

It is decided that the building supporting the tank be functional after an earthquake, therefore the tank is

given a performance level of immediate occupancy (IO). The Seismic Use Group and other performance

parameters are determined from Table 4-4, as follows;

Performance Level:

IO

(per problem statement)

Seismic Use Group:

IIIE

(Table 4-4)

Ground Motion:

3/4 MCE (B)

(Table 4-4)

Performance Objective:

3B

(Table 4-4)

A.2 *Determine site seismicity.*

The following values are assumed for this example:

SS = 1.20g

(MCE Maps)

A.3 *Determine site characteristics.*

Soil type D is assumed for this problem

Soil type: D

(Table 3-1)

A.4 *Determine site coefficients.*

Fa = 1.02

(interpolated)

(Table 3.2a)

A.5 *Determine adjusted MCE spectral response accelerations.*

SMS = FaSS = 1.02(1.20)g = 1.22g

(EQ. 3-1)

A.6 *Determine design spectral response accelerations.*

SDS = 3/4 SMS = 3/4(1.22) = 0.92g

(EQ. 3-3)

J2-2

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