Hi, I am analyzing the theoretical case for dynamic analysis on staad pro. Providing it a ground motion pulse of 1g acceleration, i am using Pinewood as material, now for dynamic cases, when i look at the time history acceleration plot, it does not make sense as i am trying to back calculate the force using F=ma, and it is much different than what i gave.ALso, how can i see time acceleration graphs for different modes. please have a look and respond as soon as possible.
STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 21-Mar-16
END JOB INFORMATION
SET Z UP
INPUT WIDTH 79
UNIT INCHES POUND
JOINT COORDINATES
1 0 0 0; 2 0 0 33.5; 3 0 0 3.35; 4 0 0 6.7; 5 0 0 10.05; 6 0 0 13.4;
7 0 0 16.75; 8 0 0 20.1; 9 0 0 23.45; 10 0 0 26.8; 11 0 0 30.15;
MEMBER INCIDENCES
1 1 3; 2 3 4; 3 4 5; 4 5 6; 5 6 7; 6 7 8; 7 8 9; 8 9 10; 9 10 11; 10 11 2;
START USER TABLE
TABLE 2
UNIT INCHES POUND
PRISMATIC
WOODRULER
0.3 0.00225 0.025 0.009 0.2 0.2 1 0.3
END
DEFINE MATERIAL START
ISOTROPIC PINEWOOD
E 1.24416e+006
POISSON 0.33
DENSITY 0
ALPHA 0.0067
DAMP 0
G 8500
ISOTROPIC CONCRETE
E 3.15e+006
POISSON 0.17
DENSITY 0.087
ALPHA 5e-006
DAMP 0.05
TYPE CONCRETE
STRENGTH FCU 4000
ISOTROPIC PINEWOOD2
E 1.24416e+006
POISSON 0.33
DENSITY 0.33
ALPHA 0.0067
DAMP 1.88
G 8500
ISOTROPIC WOOD2
E 1.24416e+006
POISSON 0.33
DENSITY 0.33
ALPHA 0.0067
DAMP 0
G 8500
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
10 PRIS YD 0.3 ZD 1
MEMBER PROPERTY AMERICAN
1 TO 9 PRIS YD 0.3 ZD 1
CONSTANTS
MATERIAL PINEWOOD MEMB 1 TO 9
MATERIAL WOOD2 MEMB 10
SUPPORTS
1 FIXED
DEFINE TIME HISTORY DT 0.0013888
TYPE 1 ACCELERATION SAVE
0 0 0.5 386.4 1 0 1.5 -386.4 2 0
ARRIVAL TIME
0 1 2 3
DAMPING 0
CUT OFF MODE SHAPE 2
LOAD 1 LOADTYPE Dead TITLE DEAD
SELFWEIGHT Z -1
LOAD 3 LOADTYPE Seismic TITLE DYNAMIC
SELFWEIGHT X 1
SELFWEIGHT Y 1
SELFWEIGHT Z 1
GROUND MOTION X 1 1 1.000000
LOAD COMB 4 COMBINATION LOAD CASE 4
1 1.0 3 1.0
LOAD COMB 5 COMBINATION LOAD CASE 5
1 1.0 3 -1.0
PERFORM ANALYSIS
PRINT ANALYSIS RESULTS
PRINT MODE SHAPES
FINISH