CFVR2611 - BS 5950 (2001) Compression Buckling
Compression Buckling checking according to British Standard 5950-01.
A pinned-pinned steel beam subjected to a Fy load of -2500 KN. A fixed steel beam subjected to a Fy load of -250 KN, applied on one end of the beam.
The beam has a length of 6 m.
The cross section is a pipe with 0.356 m of radius and 10.7 mm thickness.
The beam is made of Gr43 steel.
The aim of the example is to obtain the Compression Buckling criterion according to BS 5950-01.
Element types used in the model: BEAM4 Needed CivilFEM Modules: |
|
| Model Statistics | |
| Number of elements | 12 |
| Number of nodes | 13 |
| Number of civil materials | 1 |
| Number of cross sections | 1 |
| Number of shell vertices | 0 |
Log file: CFVR2611.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR2611' /TITLE, %NomFile%, BS 5950 (2001) Compression Buckling !-------------------------------------------------------------------------------------- ! Model definition and solve !-------------------------------------------------------------------------------------- ! CivilFEM Setup: Code & Units ~UNITS,,LENG,M ~UNITS,,TIME,S ~UNITS,,FORC,KN ~CODESEL,BS595001,BS8110,,,EC8-94 /PREP7 ! Preprocessor ! -------------------------------------------------- ! Materials ! Mat 1: Grade 43 steel ~CFMP,1,LIB,STEEL,BS5950,Gr43 ! Element Types ET,1,BEAM3 ! Type 1: 2D Beam ! Cross Section ~SSECLIB,1,1,501,1 !356x358x129 UC ! Member property ~MEMBPRO,1,BS595085,ALL,6.0,1.0,1.0,1.0,1.0,0.0,1.0,1.0,0.0,1 L = 6.0 KLTXY = 1.0 KLTXZ = 1.0 KCXY = 1.0 KCXZ = 1.0 CteRob = 0 n = 1 m = 1 DL = 0 CFBUCKXY = 1 CFBUCKXZ = 1 CHCKAXIS = 1 ~MEMBPRO,1,BS595085,ALL,L,KLTXY,KLTXZ,KCXY,KCXZ,CteRob,n,m,DL,CFBUCKXY,CFBUCKXZ,CHCKAXIS ! Beam & Shell properties ~BMSHPRO,1,BEAM,1,1,,,3,1,0,,Beam Property ! Keypoints K, ,,,, K,2,,6,, ! Lines LSTR,1,2 ! Meshing ESIZE,0.5,0, LMESH,1 FINISH /SOLU ! Solution ! -------------------------------------------------- ! Displacements DK,1,UX,,,,UY DK,2,UX,,,, ! Apply Load FK,2,FY,-2500 ! Solve SOLVE /POST1 ! Postprocessor ! -------------------------------------------------- ! Read results ~CFSET,,1,1 ! BS 5950 Check for Compression buckling ~CHKSTL,BUCK_CMP, ,-Z !-------------------------------------------------------------------------------------- ! DATA CHECK !-------------------------------------------------------------------------------------- ! Data comparison number NComp = 5 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) = 'PC' LABEL(2,1) = 'LAMBDA' LABEL(3,1) = 'LAMBDA0' LABEL(4,1) = 'NU' LABEL(5,1) = 'CRT_TOT' ! Correct values VALUE(1,1)=3105 VALUE(2,1)=63.909 VALUE(3,1)=17.476 VALUE(4,1)=0.255385 VALUE(5,1)=0.805 ! Obtained values ! BS 5950 Check for Bending+Shear ~CFSET,1 ! Load first alternative ~PLLSSTL,PC *GET,VALUE(1,2),ELEM,3,ETAB,CFETAB_I ~PLLSSTL,LAMBDA *GET,VALUE(2,2),ELEM,3,ETAB,CFETAB_I ~PLLSSTL,LAMBDA0 *GET,VALUE(3,2),ELEM,3,ETAB,CFETAB_I ~PLLSSTL,PERRYFCT *GET,VALUE(4,2),ELEM,3,ETAB,CFETAB_I ~PLLSSTL,CRT_TOT *GET,VALUE(5,2),ELEM,3,ETAB,CFETAB_I ! Warning and error tolerances TOLER( 1, 1)= 100 $ TOLER( 1, 2)= 100 TOLER( 2, 1)= 10 $ TOLER( 2, 2)= 10 TOLER( 3, 1)= 1 $ TOLER( 3, 2)= 1 TOLER( 4, 1)= 1E-2 $ TOLER( 4, 2)= 1E-1 TOLER( 5, 1)= 1E-2 $ TOLER( 5, 2)= 1E-1 !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| PC | 3105 | 3105.4 | 1.000 | 100 |
| LAMBDA | 63.909 | 63.909 | 1.000 | 10 |
| LAMBDA0 | 17.476 | 17.476 | 1.000 | 1 |
| NU | 0.25538 | 0.25539 | 1.000 | 0.1 |
| CRT_TOT | 0.805 | 0.80506 | 1.000 | 0.1 |
Contains proprietary and confidential information of Ingeciber, S.A.