CFVR8606 - AISC-ASD 14: Flexure Checking of an I Section, Strong Axis
Flexure checking according to AISC-ASD 14 of an I-shape section in the strong axis.
A steel beam is subjected to auniform load of 1.2 kip/ft.
The beam has a length of 35 ft.
Section material properties: A529Gr50 , Fy = 50 ksi or 7200 ksf , Fu = 65 ksi or 9360 ksf
Geometric properties: W 18x50, Zx = 101 in.^3 or 0.058449 ft^3 The aim of the example is to obtain the flexure criterion according to AISC-ASD 14.
Reference: AISC, Design Examples, Version 13.0 Example F.1-1a, W Shape Flexural Member Design in Strong Axis Bending, Continuously Braced
Element types used in the model: BEAM3 Needed CivilFEM Modules: |
|
| Model Statistics | |
| Number of elements | 2 |
| Number of nodes | 3 |
| Number of civil materials | 1 |
| Number of cross sections | 1 |
| Number of shell vertices | 0 |
Log file: CFVR8606.DAT
! DESCRIPTION FINISH ~CFCLEAR,,1 NomFile='CFVR8606' /TITLE, %NomFile%, AISC-ASD 14: Flexure Checking of I section Strong Axis !------------------------------------------------------------------------------- ! Model definition !------------------------------------------------------------------------------- ! CivilFEM Setup: Code & Units ~UNITS,,LENG,FT ~UNITS,,TIME,S ~UNITS,,FORC,KIPS ~UNITS,,PRES,,0 ,ksf ~CODESEL,AISC14 /PREP7 ! Materials ~CFMP,1,LIB,STEEL,ASTM,A529Gr50 ! Element Types ET,1,BEAM3 ! Type 1: 2D Beam ! Cross Section ~SSECLIB,1,1,51,148 !W 18x50 !Member Properties ~MEMBPRO,1,AISC14,ALL,35.00,1.000,1.000,1.000,1.000,35.00, ! Beam & Shell Property ~BMSHPRO,1,BEAM,1,1,,,3,1,0,,Beam 1 ! Nodes N,1,0.,0. N,2,17.5,0. N,3,35.,0. ! Elements E,1,2 E,2,3 /SOLU ! Loads D,1, , , , , ,UX,UY, , , , D,3, , , , , , ,UY, , , , SFBEAM,1,1,PRES,1.2, , , , , ,0 SFBEAM,2,1,PRES,1.2, , , , , ,0 SOLVE /POST1 ~CFSET,,1,1 ~CHKSTL,BENDING,Z,ASD !------------------------------------------------------------------------------------- ! DATA CHECK !------------------------------------------------------------------------------------- ! Data comparison number NComp = 7 NComp_ch = 0 ! Marix 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) = 'CLS_BEND' LABEL(2,1) = 'CHK_YLD' LABEL(3,1) = 'MP' LABEL(4,1) = 'CRT_YLD' LABEL(5,1) = 'CHK_LTB' LABEL(6,1) = 'CRT_LTB' LABEL(7,1) = 'CRT_TOT' ! Correct values VALUE(1,1) = 1 VALUE(2,1) = 1 VALUE(3,1) = 420.83 VALUE(4,1) = 183.75/((420.83)/1.67) VALUE(5,1) = 1 VALUE(6,1) = 183.75/((92.011)/1.67) VALUE(7,1) = 183.75/((92.011)/1.67) ! Comparison ~CFGET,VALUE(1,2),ELEMENT,1,RESULT,CLS_BEND,J ~CFGET,VALUE(2,2),ELEMENT,1,RESULT,CHK_YLD,J ~CFGET,VALUE(3,2),ELEMENT,1,RESULT,MP,J ~CFGET,VALUE(4,2),ELEMENT,1,RESULT,CRT_YLD,J ~CFGET,VALUE(5,2),ELEMENT,1,RESULT,CHK_LTB,J ~CFGET,VALUE(6,2),ELEMENT,1,RESULT,CRT_LTB,J ~CFGET,VALUE(7,2),ELEMENT,1,RESULT,CRT_TOT,J ! Warning and error tolerances TOLER(1,1)= 0.003*VALUE(1,1) $ TOLER(1,2)= 0.003*VALUE(1,1) TOLER(2,1)= 0.003*VALUE(2,1) $ TOLER(2,2)= 0.003*VALUE(2,1) TOLER(3,1)= 0.003*VALUE(3,1) $ TOLER(3,2)= 0.003*VALUE(3,1) TOLER(4,1)= 0.003*VALUE(4,1) $ TOLER(4,2)= 0.003*VALUE(4,1) TOLER(5,1)= 0.003*VALUE(5,1) $ TOLER(5,2)= 0.003*VALUE(5,1) TOLER(6,1)= 0.003*VALUE(6,1) $ TOLER(6,2)= 0.003*VALUE(6,1) TOLER(7,1)= 0.003*VALUE(7,1) $ TOLER(7,2)= 0.003*VALUE(7,1) !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| CLS_BEND | 1 | 1 | 1.000 | 0.003 |
| CHK_YLD | 1 | 1 | 1.000 | 0.003 |
| MP | 420.83 | 420.83 | 1.000 | 1.262 |
| CRT_YLD | 0.72918 | 0.72918 | 1.000 | 0.002188 |
| CHK_LTB | 1 | 1 | 1.000 | 0.003 |
| CRT_LTB | 3.3351 | 3.3322 | 1.001 | 0.01001 |
| CRT_TOT | 3.3351 | 3.3322 | 1.001 | 0.01001 |
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