EXPLANATION IN RIGID FRAME DESIGN HELP .

P DELTA: The following options are available as set by DS_BUILD(frame 74) as shown below:

Input Option

DS_BUILD (frame 74)

'N' 0.0 No P-delta analysis is run. First Order Analysis only No second order effects considered

'S' < 1.0 Stability check report Report on seismic second order drift For more information, see PE 8-00-9.

'2' 2.0 Standard P-delta The second order P-delta moments and displacement

are calculated in frame analysis. For more information, see PE 1-02-2.

'3' 3.0 EC3 P-delta The second order P-delta moments and displacement

are calculated in frame analysis. EC3 frame imperfections based on L/200. Default setting for EC3 codes. For more information, see PE 1-02-2.

'4' 4.0 CSA P-delta The second order P-delta moments and displacement

are calculated in frame analysis. CSA notional loads based on axial load * 0.005 Default setting for CSA codes.

'5' 5.0 Reduced P-delta The second order P-delta moments and displacement

are calculated in frame analysis. Member stiffness adjusted by 80 percent

'DA' 6.0 AISC 05 Direct Analysis The second order P-delta moments and displacement

are calculated in frame analysis. AISC 05 notional loads based on:

0.0020 * gravity loads for limit states 0.0032 * gravity loads for working stress

Member stiffness adjusted by 80 percent. For more information, see PE 6-06-3.

'EL' AISC 05 Effective Length The second order P-delta moments and displacement

are calculated in frame analysis. AISC 05 notional loads based on:

0.0020 * gravity loads for limit states 0.0032 * gravity loads for working stress

Default setting for AISC 05 code. For more information, see PE 6-06-3.