DIRECT METHOD ANALYSIS - GENERAL

Giorgio Figari — Mon, 29 Jun 2015 19:29:09 GMT

I'm trying to crosscheck a AISC design example regarding the DIRECT METHOD ANALYSIS.

My problem is that, if I check the moments and the displacements obtained by the Staad Model, I cannot get the same results given in the example.

Could anybody have a look and let me know where in my mistake in the staad model?

Here below both the staad model, while the the pdf reporting the AISC design example C.1A is given as attachment.

Many thanks in advance

Giorgio

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 11-Dec-09
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 0 20 0; 3 0 4 0; 4 0 8 0; 5 0 12 0; 6 0 16 0; 7 30 0 0; 8 30 4 0;
9 30 8 0; 10 30 12 0; 11 30 16 0; 12 30 20 0; 13 45 0 0; 14 45 4 0; 15 45 8 0;
16 45 12 0; 17 45 16 0; 18 45 20 0; 19 7.5 20 0; 20 15 20 0; 21 22.5 20 0;
22 33.75 20 0; 23 37.5 20 0; 24 41.25 20 0;
MEMBER INCIDENCES
1 1 3; 2 3 4; 3 4 5; 4 5 6; 5 6 2; 6 7 8; 7 8 9; 8 9 10; 9 10 11; 10 11 12;
11 2 19; 12 13 14; 13 14 15; 14 15 16; 15 16 17; 16 17 18; 17 12 22; 18 19 20;
19 20 21; 20 21 12; 21 22 23; 22 23 24; 23 24 18;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 4.28151e+006
POISSON 0.3
DENSITY 0.489024
ALPHA 1.2e-005
DAMP 0.03
G 1.64674e+006
TYPE STEEL
STRENGTH FY 5288.19 FU 8517.08 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 TO 10 12 TO 16 TABLE ST W12X65
11 17 TO 23 TABLE ST W18X40
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 7 13 PINNED
MEMBER RELEASE
17 START MY MZ
23 END MY MZ
DEFINE DIRECT ANALYSIS
FLEX 1 ALL
*FYLD 6500 LIST ALL
AXIAL ALL
NOTIONAL LOAD FACTOR 0.002
END
LOAD 1
MEMBER LOAD
11 18 TO 20 UNI GY -2.4
JOINT LOAD
2 12 FY -36
18 FY -144
*
LOAD 2
NOTIONAL LOAD
1 X 0.002
LOAD 10
REPEAT LOAD
1 1.0 2 1.0
PERFORM ANALYSIS PRINT ALL
CHANGE
LOAD 20
REPEAT LOAD
1 1.0 2 1.0
PERFORM DIRECT ANALYSIS LRFD PRINT LOAD DATA
FINISH

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DIRECT METHOD ANALYSIS - GENERAL

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