Performance Category 1 and 2 Structures, Systems, and Components.

DOE-STD-1020-2002

2.3.1 Performance Category 1 and 2 Structures, Systems, and

Components.

Seismic design or evaluation of PC-1 and PC-2 SSCs is based on model building code

seismic provisions. In these criteria, the current version of the International Building Code shall

be followed. Alternatively, the other equivalent model building codes may be used as discussed

in Section 2.2. All of the IBC 2000 seismic provisions shall be followed for Performance

Category 1 and PC-2 SSCs Load combinations to be used for PC-1 and PC-2 will be based on

the provisions in the IBC 2000. Use of site specific data will be limited per provisions of IBC

2000. Post-Northridge earthquake SAC recommendations should be taken into consideration for

steel structures.

The steps in the procedure for PC-1 and PC-2 SSCs are as follows:

Evaluate element forces for non-seismic loads, DNS, expected to be acting

concurrently with an earthquake.

Evaluate element forces, DSI, for earthquake loads.

Static force method, where V is applied as a load distributed over the

height of the structure for regular facilities, or dynamic force method

for irregular facilities as described in the IBC 2000.

In either case, the total base shear is given in the IBC 2000 where the

parameters are evaluated as follows:

Use Seismic Use Group I for design of PC-1 SSCs

Use Seismic Use Group III for design of PC-2 SSCs which

essentially results in a multiplier of 1.5 to forces for PC-1

The seismic design categories per IBC 2000 must also be taken into

consideration.

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