Pdelta Analysis / Perform Analysis Command

Hello everyone,

Q1: I want to know whether this format is already correct or not?

Q2: After we define the seismic definition, then we start to add Load Case of seismic first.. Does the PDELTA ANALYSIS command should be written in this load case? or PERFORM ANALYSIS ?

Q3: To obtain the result of all load cases acting concurrently, I use Repeat Load instead of Load Combination. Does it mean that even we don't use PDELTA ANALYSIS command, we'll get the same result since we already use Repeat Load?

Q5: The last command (before FINISH), it should be PDELTA ANALYSIS again or just PERFORM ANALYSIS ?

Please your kindly advice.

Thanks a lot.

Really appreciate your help.

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DEFINE IBC 2006 ACCIDENTAL

SS 0.1 S1 0.3 I 1 RX 8 RZ 8 SCLASS 3 TL 4 FA 1.005 FV 1.43
SELFWEIGHT 1
MEMBER WEIGHT
_ROOF UNI 5
FLOOR WEIGHT
_ROOFSLAB FLOAD 2.88
********************************************************************
LOAD 1 LOADTYPE Seismic TITLE EX
IBC LOAD X 1
PDELTA ANALYSIS 
CHANGE

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LOAD 2 LOADTYPE Seismic TITLE EZ
IBC LOAD Z 1
PDELTA ANALYSIS 
CHANGE
********************************************************************
LOAD 3 LOADTYPE Dead TITLE DEAD
SELFWEIGHT Y -1
FLOOR LOAD
_ROOFSLAB FLOAD -2.88 GY
MEMBER LOAD
_ROOF UNI GY -5
LOAD 4 LOADTYPE Live TITLE LIVE
FLOOR LOAD
_ROOFSLAB FLOAD -1 GY

*** Then to combine we use Repeat Load instead of Load Combination

PDELTA ANALYSIS 
FINISH