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Yes. One can have different support conditions specified within the same model, each with its own set of load cases followed by PERFORM ANALYSIS and CHANGE commands
Here are a few simple rules that one should follow for such definitions
1. Each set of support condition should be followed by corresponding load cases and PERFORM ANALYSIS and CHANGE commands.2. Supports should be specified in the same order before and after the CHANGE.3. The number of supports in subsequent specifications should not increase. If the later cases have more supports, it is required to specify dummy supports at such nodes for prior scenarios using FIXED BUT FX FY FZ MX MY MZ ( which means unrestrained ).
Here is an example file with multiple support specifications
STAAD PLANE EXAMPLE FOR MULTIPLE SUPPORTSSTART JOB INFORMATIONENGINEER DATE 28-Oct-14END JOB INFORMATIONSET NL 2UNIT FEET KIPJOINT COORDINATES1 0 0 0; 2 0 10 0; 3 0 20 0; 4 15 20 0; 5 15 10 0; 6 15 0 0;MEMBER INCIDENCES1 1 2; 2 2 3; 3 3 4; 4 4 5; 5 5 6; 6 1 5; 7 2 6; 8 2 4; 9 3 5; 10 2 5;MEMBER PROPERTY AMERICAN1 TO 10 TABLE ST W12X26UNIT INCHES KIPDEFINE MATERIAL STARTISOTROPIC MATERIAL1E 29000POISSON 0.3END DEFINE MATERIALCONSTANTSMATERIAL MATERIAL1 ALLSUPPORTS1 PINNED6 PINNED2 TO 5 FIXED BUT FX FY FZ MX MY MZLOAD 1JOINT LOAD2 FX 153 FX 10PERFORM ANALYSISPRINT SUPPORT REACTIONSCHANGE*SUPPORTS1 PINNED6 PINNED2 TO 5 FIXED BUT FY KFX 10000LOAD 2JOINT LOAD4 FX -105 FX -15PERFORM ANALYSISCHANGEPRINT SUPPORT REACTIONS*FINISH
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