Direct Analysis with Reduced EI

Hi,

I am trying to compare member intermediate(between nodes) displacement in direct analysis with REDUCEDEI 0 AND REDUCEDEI 1. I picked member#6 (right col. upper portion).

No difference in displacement results in load case 7. REDUCEDEI 0 should have less intermediate(between nodes) displacement than REDUCEDEI 1 Please review attached model and  comment.

Thanks

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STAAD SPACE
START JOB INFORMATION
ENGINEER DATE XX XX XX
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 0 4 0; 3 5 4 0; 4 5 0 0; 5 0 8 0; 6 5 8 0;
MEMBER INCIDENCES
1 1 2; 2 2 3; 3 3 4; 4 2 5; 5 5 6; 6 6 3;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 2.05e+008
POISSON 0.3
DENSITY 76.8195
ALPHA 1.2e-005
DAMP 0.03
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 TO 6 TABLE ST W8X28
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 4 FIXED
***********************************************
***********************************************
DEFINE REFERENCE LOADS
LOAD R1 LOADTYPE Dead  TITLE REF LOAD CASE 1
SELFWEIGHT Y -1
MEMBER LOAD
2 5 UNI GY -100
END DEFINE REFERENCE LOADS
***********************************************
***********************************************
* DIRECT ANALYSIS PARAMETERS
DEFINE DIRECT ANALYSIS
* SWAY FRAME MEMBERS
FLEX 1 ALL
*
* NO BRACED FRAME MEMBERS
*AXIAL
*
* SET NOTIONAL LOAD TO 0.002 TO IDENTIFY THAT TAU
NOTIONAL LOAD FACTOR 0.002
END
*******************************************
LOAD 1 LOADTYPE Dead  TITLE LINEAR
REFERENCE LOAD
R1 1.0
NOTIONAL LOAD
R1 X 0.002
*
PERFORM ANALYSIS
*
CHANGE
*******************************************
*******************************************
LOAD 2 LOADTYPE Dead  TITLE PDELTA
REFERENCE LOAD
R1 1.0
NOTIONAL LOAD
R1 X 0.002
*SELFWEIGHT Y -1
*
PDELTA 5 ANALYSIS SMALLDELTA
CHANGE
*******************************************
*******************************************
LOAD 3 LOADTYPE Dead  TITLE DIRECT
REFERENCE LOAD
R1 1.0
NOTIONAL LOAD
R1 X 0.002
*
LOAD 4 LOADTYPE Dead  TITLE DIRECT
REFERENCE LOAD
R1 1.0
NOTIONAL LOAD
R1 X -0.002
*
PERFORM DIRECT ANALYSIS ASD ITERATION 4 TAUTOL 0.01 DISPTOL 0.001 PDITER 15 -
PRINT LOAD DATA
CHANGE
*
LOAD 5 LOADTYPE Dead  TITLE REF LOAD CASE 5
SELFWEIGHT Y -1
MEMBER LOAD
2 5 UNI GY -100
*
LOAD 6 LOADTYPE Dead  TITLE DIRECT
REPEAT LOAD
5 1.0
NOTIONAL LOAD
5 X 0.002
*
LOAD 7 LOADTYPE Dead  TITLE DIRECT
REPEAT LOAD
6 1.0
*
*WITH REDUCEDEI 0 MEANS SECTIONAL DISPLACEMENT AT FULL E AND I
*AND DISPLACEMENT AT NODES WILL BE AT REDUCED E AND I
*WITH REDUCEDEI 1 MEANS SECTIONAL DISPLACEMENT AT REDUCED E AND I
*AND DISPLACEMENT AT NODES WILL BE AT REDUCED E AND I AS WELL
*
PERFORM DIRECT ANALYSIS ASD ITERATION 4 TAUTOL 0.01 -
DISPTOL 0.001 PDITER 15 REDUCEDEI 0 -
PRINT LOAD DATA
CHANGE
*
*NOTIONAL LOAD
*R1 X 0.002
**************************
*MY IN PUT
**********************
*LOAD LIST 2 3
*PARAMETER 1
*CODE CANADIAN
*LY 2 MEMB 2 5
*CHECK CODE ALL
FINISH