Modal analysis input file STAAD SPACE START JOB INFORMATION ENGINEER DATE 24-Jan-11 END JOB INFORMATION INPUT WIDTH 79 UNIT METER KN JOINT COORDINATES 1 0 0 0; 2 0 4 0; 3 4 0 0; 4 4 4 0; 5 0 0 -4; 6 0 4 -4; 7 4 0 -4; 8 4 4 -4; MEMBER INCIDENCES 1 1 2; 2 3 4; 3 2 4; 4 5 6; 5 7 8; 6 6 8; 7 2 6; 8 4 8; DEFINE MATERIAL START ISOTROPIC CONCRETE E 2.17185e+007 POISSON 0.17 DENSITY 23.5616 ALPHA 1e-005 DAMP 0.05 END DEFINE MATERIAL MEMBER PROPERTY AMERICAN 1 2 4 5 PRIS YD 0.45 ZD 0.45 3 6 TO 8 PRIS YD 0.4 ZD 0.3 CONSTANTS MATERIAL CONCRETE ALL SUPPORTS 1 3 5 7 FIXED CUTOFF MODE SHAPE 100 LOAD 1 LOADTYPE None TITLE Modal analysis SELFWEIGHT X 1 SELFWEIGHT Z 1 SELFWEIGHT Y 1 MEMBER LOAD 3 6 TO 8 UNI GX 15 3 6 TO 8 UNI GZ 15 3 6 TO 8 UNI GY 15 FLOOR LOAD YRANGE 4 4 FLOAD 3.75 XRANGE 0 4 ZRANGE -4 0 GX YRANGE 4 4 FLOAD 3.75 XRANGE 0 4 ZRANGE -4 0 GZ YRANGE 4 4 FLOAD 3.75 XRANGE 0 4 ZRANGE -4 0 GY FLOOR LOAD YRANGE 4 4 FLOAD 5 XRANGE 0 4 ZRANGE -4 0 GX YRANGE 4 4 FLOAD 5 XRANGE 0 4 ZRANGE -4 0 GZ YRANGE 4 4 FLOAD 5 XRANGE 0 4 ZRANGE -4 0 GY MODAL CALCULATION REQUESTED PERFORM ANALYSIS FINISH Rayleigh method input file STAAD SPACE START JOB INFORMATION ENGINEER DATE 24-Jan-11 END JOB INFORMATION INPUT WIDTH 79 UNIT METER KN JOINT COORDINATES 1 0 0 0; 2 0 4 0; 3 4 0 0; 4 4 4 0; 5 0 0 -4; 6 0 4 -4; 7 4 0 -4; 8 4 4 -4; MEMBER INCIDENCES1 1 2; 2 3 4; 3 2 4; 4 5 6; 5 7 8; 6 6 8; 7 2 6; 8 4 8; DEFINE MATERIAL START ISOTROPIC CONCRETE E 2.17185e+007 POISSON 0.17 DENSITY 23.5616 ALPHA 1e-005 DAMP 0.05 END DEFINE MATERIAL MEMBER PROPERTY AMERICAN 1 2 4 5 PRIS YD 0.45 ZD 0.45 3 6 TO 8 PRIS YD 0.4 ZD 0.3 CONSTANTS MATERIAL CONCRETE ALL SUPPORTS 1 3 5 7 FIXED CUTOFF MODE SHAPE 50 LOAD 1 LOADTYPE None TITLE Rayleigh frequency X CALCULATE RAYLEIGH FREQUENCY SELFWEIGHT X -1 LIST 1 TO 8 MEMBER LOAD 3 6 TO 8 UNI GX -15 FLOOR LOAD YRANGE 4 4 FLOAD -3.75 XRANGE 0 4 ZRANGE -4 0 GX FLOOR LOAD YRANGE 4 4 FLOAD -5 XRANGE 0 4 ZRANGE -4 0 GX LOAD 2 LOADTYPE None TITLE Rayleigh frequency Z CALCULATE RAYLEIGH FREQUENCY SELFWEIGHT Z -1 LIST 1 TO 8 MEMBER LOAD 3 6 TO 8 UNI GZ -15 FLOOR LOAD YRANGE 4 4 FLOAD -3.75 XRANGE 0 4 ZRANGE -4 0 GZ FLOOR LOAD YRANGE 4 4 FLOAD -5 XRANGE 0 4 ZRANGE -4 0 GZ PERFORM ANALYSIS FINISH