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CFVR8713 - AISC-LRFD 14: Flexure Checking of Pipe Section

Flexure checking according to AISC-LRFD 14 of Pipe section

A steel beam is subjected to a uniform load of 1.28 k/ft.

The beam has a length of 16 ft.
Section material properties: A500 GrB , Fy = 35 ksf , Fu = 60 ksi
Geometric properties: Pipe 8 X Strong The aim of the example is to obtain the bending criterion according to AISC-LRFD 14.
Reference: AISC, Design Examples, Version 13.0 Example F.9a, Pipe Flexural Member

Element types used in the model: BEAM3

Needed CivilFEM Modules:
Geotechnical Module
Bridges and Civil Non Linearities Module
Advanced Prestressed Concrete Module

The example can be launched on an educational license.
KEYWORDS
Beam
Cross Section
Steel
Code Checking/Design
AISC14

Model Statistics
Number of elements 10
Number of nodes 11
Number of civil materials 1
Number of cross sections 1
Number of shell vertices 0

Log file: CFVR8713.DAT


! DESCRIPTION 

FINISH
~CFCLEAR,,1
NomFile='CFVR8713'
/TITLE, %NomFile%, AISC-LRFD 14: Pipe Flexural Member

!-------------------------------------------------------------------------------
! Model definition
!-------------------------------------------------------------------------------
! CivilFEM Setup: Code & Units
~UNITS,,LENG,in
~UNITS,,TIME,S
~UNITS,,FORC,KIPS
~UNITS,,PRES,,0 ,ksi
~CODESEL,AISC14
   

/PREP7

! Materials
~CFMP,1,LIB,STEEL,ASTM,A36  
~CFMP,1,USER
~CFMP,1,AISC14  ,Fy,,35 ,1,0,0  ! Same Properties as A500 grade B
~CFMP,1,AISC14  ,Fu,,60 ,1,0,0  ! Same Properties as A500 grade B
! Element Types
ET,1,BEAM3  ! Type 1: 2D Beam

! Cross Section
~SSECLIB,1,1,63,13   !PX 8 
~SECMDF,1,STRPROP,ASEC,,2  
~SECMDF,1,MECHPROP,WPY      ,,31 ,2,0,0 !Tabla 1-14 AISC
!~SECMDF,1,UPDATE
~SECMDF,1,MECHPROP,WPZ      ,,31 ,2,0,0 !Tabla 1-14 AISC
!~SECMDF,1,UPDATE


~MEMBPRO,1,AISC14,ALL,192.0,0.5000,0.5000,1.000,1.000,192.0,

! Beam & Shell Property
~BMSHPRO,1,BEAM,1,1,,,3,1,0,,Beam 1

! Nodes
N,1,0.,0.
N,11,192.,0.
FILL,1,11,9,,1

! Elements
E,1,2
EGEN,10,1,1

/SOLU
! Loads
D, 1,ALL 
D,11,ALL,
SFBEAM,ALL,1,PRES,1.28/12, , , , , ,0

SOLVE

/POST1
~CFSET,,1,1 
~CHKSTL,BENDING,Z,LRFD 

!-------------------------------------------------------------------------------------
! DATA CHECK
!-------------------------------------------------------------------------------------
! Data comparison number
NComp = 6
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) = 'CHK_YLD'
LABEL(2,1) = 'CLS_BEND'
LABEL(3,1) = 'MP'
LABEL(4,1) = 'CRT_YLD'
LABEL(5,1) = 'CRT_TOT'
LABEL(6,1) = 'MU'


! Correct values
VALUE(1,1) = 1
VALUE(2,1) = 1
VALUE(3,1) = 1085
VALUE(4,1) = 0.335
VALUE(5,1) = 0.335
VALUE(6,1) = 327.68

! Comparison

~CFGET,VALUE(1,2),ELEMENT,1,RESULT,CHK_YLD,I
~CFGET,VALUE(2,2),ELEMENT,1,RESULT,CLS_BEND,I
~CFGET,VALUE(3,2),ELEMENT,1,RESULT,MP,I
~CFGET,VALUE(4,2),ELEMENT,1,RESULT,CRT_YLD,I
~CFGET,VALUE(5,2),ELEMENT,1,RESULT,CRT_TOT,I
~CFGET,VALUE(6,2),ELEMENT,1,RESULT,MU,I

! 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) 

!--------------------------------------------------------------------------------------
! Results comparison
!--------------------------------------------------------------------------------------
  COMPARA.MAC

Results

LabelTargetCivilFEMRatioTolerance
CHK_YLD 1 11.000 0.003
CLS_BEND 1 11.000 0.003
MP 1085 10851.000 3.255
CRT_YLD 0.335 0.335570.9980.001005
CRT_TOT 0.335 0.335570.9980.001005
MU 327.68 327.681.000 0.983


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