CFVR2303 - Steel Checking according to LRFD
Compression flexural buckling checking according to LRFD 2nd Edition
A 2D pinned steel frame with W16x31 and W12x120 sections is subjected to vertical forces of 1100 kips at both corners.
Determine the equivalent slenderness parameter, critical stress, nominal axial strength, total criterion and section classification according to LRFD.
Element types used in the model: BEAM3 Needed CivilFEM Modules: |
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| Model Statistics | |
| Number of elements | 49 |
| Number of nodes | 50 |
| Number of civil materials | 1 |
| Number of cross sections | 2 |
| Number of shell vertices | 0 |
Log file: CFVR2303.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR2303' /TITLE, %NomFile%, LRFD: Compression Flexural Buckling Checking !------------------------------------------------------------------ ! Model definition !------------------------------------------------------------------ ! CivilFEM Setup: Code & Units ~CODESEL,LRFD,EC2,,,EC8-94 ~UNITS,,MONE,EURO ~UNITS,,LENG,FT ~UNITS,,TIME,S ~UNITS,,FORC,KIPS ~UNITS,,PRES,,0,uuP ~UNITS,,MASS,,0,uuM /PREP7 ! Preprocessor ! -------------------------------------------------- ! Materials ~CFMP,1,LIB,STEEL,ASTM,A572Gr50 ! Element Types ET,1,Beam3 ! Cross Section ~SSECLIB,1,1,51,161 ! W 16x31 ~SSECLIB,2,1,51,209 ! W 12x136 ! Beam & Shell Property ~BMSHPRO,1,BEAM,1,1,,,3,1,0,,Beam 1 ~BMSHPRO,2,BEAM,2,2,,,3,1,0,,Beam 2 ! Member property ~MEMBPRO,1,LRFD,ALL,15.00,2.2,2.2,1.0,1.0,0.0, ~MEMBPRO,1,NLMOD,ALL,0 ~MEMBPRO,1,NAME,Member Property 1 ! Nodes N, N,15,,15 N,35,20,15 N,50,20,0 FILL,1,15,13,,,1,1,1 FILL,15,35,19,,,1,1,1 FILL,35,50,14,,,1,1,1 ! Elements ! Beam 1 TYPE,1 MAT,1 REAL,1 ESYS,0 SECNUM, E,15,16 EGEN,20,1,1,,1 ! Beam 2 TYPE,1 MAT,1 REAL,2 ESYS,0 SECNUM, E,1,2 EGEN,14,1,21,,1 E,35,36 EGEN,15,1,35,,1 ! Solution ! -------------------------------------------------- /SOLU ! Constraints D,1,UX D,1,UY D,50,UX D,50,UY ! Apply Load F,35,FY,-1100 F,15,FY,-1100 ! Solve SOLVE /POST1 ! Postprocessor ! -------------------------------------------------- ! Read results ~CFSET,,1,1 ! First load step ! Compression Flexural Buckling ~CHKSTL,COMPFBK !----------------------------------------------------------------- ! DATA CHECK !----------------------------------------------------------------- ! Data comparison number NComp = 5 NComp_ch = 0 ! Matrix dim. *DIM,LABEL,CHAR,Ncomp,1 *DIM,LABEL_CH,CHAR,Ncomp_ch,1 *DIM,VALUE,,Ncomp,3 *DIM,VALUE_CH,CHAR,Ncomp_ch,3 *DIM,TOLER,,Ncomp,2 ! Labels LABEL(1,1) = 'LAMBDA ' LABEL(2,1) = 'FCR ' LABEL(3,1) = 'PN ' LABEL(4,1) = 'CRT_TOT ' LABEL(5,1) = 'CLS_COMP' ! Correct values VALUE(1,1)= 0.938 VALUE(2,1)= 4982.0 VALUE(3,1)= 1380.4 VALUE(4,1)= 0.937 VALUE(5,1)= 2 ! Comparison ~CFGET,value( 1,2),ELEMENT,28,RESULT,LAMBDA ,J ~CFGET,value( 2,2),ELEMENT,28,RESULT,FCR ,J ~CFGET,value( 3,2),ELEMENT,28,RESULT,PN ,J ~CFGET,value( 4,2),ELEMENT,28,RESULT,CRT_TOT ,J ~CFGET,value( 5,2),ELEMENT,28,RESULT,CLS_COMP,J ! Warning and error tolerances TOLER( 1, 1)= 1E-03 $ TOLER( 1, 2)= 1E-03 TOLER( 2, 1)= 1E-00 $ TOLER( 2, 2)= 1E-00 TOLER( 3, 1)= 1E-00 $ TOLER( 3, 2)= 1E-00 TOLER( 4, 1)= 1E-03 $ TOLER( 4, 2)= 1E-03 TOLER( 5, 1)= 1E-03 $ TOLER( 5, 2)= 1E-03 !---------------------------------------------------------------- ! Results comparison !---------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| LAMBDA | 0.938 | 0.93799 | 1.000 | 0.001 |
| FCR | 4982 | 4982 | 1.000 | 1 |
| PN | 1380.4 | 1380.4 | 1.000 | 1 |
| CRT_TOT | 0.937 | 0.93747 | 1.000 | 0.001 |
| CLS_COMP | 2 | 2 | 1.000 | 0.001 |
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