CFVR2305 - Steel Checking according to LRFD
Axial and bending checking according to LRFD 2nd Edition
A steel pinned-pìnned beam of 240 feet with W12x210 section is subjected to an axial compression force of 800 kips and different moments at both ends.
Determine the required flexural strength, plastic bending moment, total criterion, equivalent slenderness parameter and critical stress according to LRFD.
Element types used in the model: BEAM3 Needed CivilFEM Modules: |
|
| Model Statistics | |
| Number of elements | 19 |
| Number of nodes | 20 |
| Number of civil materials | 1 |
| Number of cross sections | 1 |
| Number of shell vertices | 0 |
Log file: CFVR2305.DAT
finish ~CFCLEAR,,1 NomFile='CFVR2305' /TITLE, %NomFile%, LRFD: Compression Flexural Buckling Checking !------------------------------------------------------------------ ! Model definition !------------------------------------------------------------------ ! CivilFEM Setup: Code & Units ~CODESEL,LRFD,EC2,,,EC8-94 ~UNITS,,MONE,EURO ~UNITS,,LENG,IN ~UNITS,,TIME,S ~UNITS,,FORC,KIPS ~UNITS,,PRES,,0,uuP ~UNITS,,MASS,,0,uuM /PREP7 ! Preprocessor ! -------------------------------------------------- ! Materials ~CFMP,1,LIB,STEEL,ASTM,A36 ! Element Types ET,1,Beam3 ! Cross Section ~SSECLIB,1,1,51,205 ! W 12x210 ! Beam & Shell Property ~BMSHPRO,1,BEAM,1,1,,,3,1,0,,Beam 1 ! Member property ~MEMBPRO,1,NAME,Member Property 1 ~MEMBPRO,1,LRFD,ALL,240.0,1.0,1.9,1.0,1.265,240.0, ~MEMBPRO,1,NAME,Member Property 1 ! Nodes N,1 N,20,,240 FILL,1,20,18,,,1,1,1 ! Elements E,1,2 EGEN,19,1,1,1 ! Solution ! -------------------------------------------------- /SOLU ! Constraints D,1,,,,,,UX,UY D,20,,,,,,UX ! Apply Load F,20,FY,-800 F,1,FY,800 F,20,MZ,-420*12 F,1,MZ,200*12 ! Solve SOLVE /POST1 ! Postprocessor ! -------------------------------------------------- ! Read results ~CFSET,,1,1 ! First load step ! Axial+bending checking ~CHKSTL,BEND_AXL !------------------------------------------------------------------ ! DATA CHECK !------------------------------------------------------------------ ! Data comparison number NComp = 7 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) = 'MPY ' LABEL(2,1) = 'MPZ ' LABEL(3,1) = 'MUZ ' LABEL(4,1) = 'CRT_YLDZ' LABEL(5,1) = 'CRT_TOT ' LABEL(6,1) = 'LAMBDA ' LABEL(7,1) = 'FCR ' ! Correct values VALUE(1,1)=0.57239996D+04 VALUE(2,1)=0.12527999D+05 VALUE(3,1)=0.37894737D+04 VALUE(4,1)=0.30248035D+00 VALUE(5,1)=0.82964635D+00 VALUE(6,1)=0.82061562D+00 VALUE(7,1)=0.27157763D+02 ! Comparison ~CFGET,value( 1,2),ELEMENT,10,RESULT,MPY ,J ~CFGET,value( 2,2),ELEMENT,10,RESULT,MPZ ,J ~CFGET,value( 3,2),ELEMENT,10,RESULT,MUZ ,J ~CFGET,value( 4,2),ELEMENT,10,RESULT,CRT_YLDZ,J ~CFGET,value( 5,2),ELEMENT,10,RESULT,CRT_TOT ,J ~CFGET,value( 6,2),ELEMENT,10,RESULT,LAMBDA ,J ~CFGET,value( 7,2),ELEMENT,10,RESULT,FCR ,J ! Warning and error tolerances TOLER( 1, 1)= 1E-03 $ TOLER( 1, 2)= 1E-03 TOLER( 2, 1)= 1E-03 $ TOLER( 2, 2)= 1E-03 TOLER( 3, 1)= 1E-03 $ TOLER( 3, 2)= 1E-03 TOLER( 4, 1)= 1E-01 $ TOLER( 4, 2)= 1E-01 TOLER( 5, 1)= 1E-01 $ TOLER( 5, 2)= 1E-01 TOLER( 6, 1)= 1E-03 $ TOLER( 6, 2)= 1E-03 TOLER( 7, 1)= 1E-03 $ TOLER( 7, 2)= 1E-03 !------------------------------------------------------------------ ! Results comparison !------------------------------------------------------------------ COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| MPY | 5724 | 5724 | 1.000 | 0.001 |
| MPZ | 12528 | 12528 | 1.000 | 0.001 |
| MUZ | 3789.5 | 3789.5 | 1.000 | 0.001 |
| CRT_YLDZ | 0.30248 | 0.33609 | 0.889 | 0.1 |
| CRT_TOT | 0.82965 | 0.85952 | 0.964 | 0.1 |
| LAMBDA | 0.82062 | 0.82062 | 1.000 | 0.001 |
| FCR | 27.158 | 27.158 | 1.000 | 0.001 |
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