CFVR3703 - Effective stresses

Effective stresses on a 2D Model with irregular mesh.

A plane model is used to analyze the effective stresses obtained when applying the seepage results on a structural analysis.
The seepage model is a 5.0m x 6.0 m rectangle and the structural model is a is a 5.0 m x 10.0 m rectangle.

Element types used in the model: PLANE42

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
Geotechnics

Model Statistics
Number of elements 50
Number of nodes 66
Number of civil materials 1
Number of cross sections 0
Number of shell vertices 0

Log file: CFVR3703.DAT


! -------------------------------------------------------------------------------------
! SEEPAGE ANALYSIS
! -------------------------------------------------------------------------------------
FINISH
~CFCLEAR,,1
~CFACTIV,GETC,Y
~UNITS,,FORC,KN

NomFile='CFVR3703'
/TITLE, %NomFile%, Effective stresses

~SEEPAGE,2D

/PREP7
~CFMP,1,LIB,SOIL,,MH

! Rectangle B*H
H = 6
B = 5
! Relative location of the rectangle
XR = 0
YR = 0
K,1,XR,YR
K,2,XR+B,YR
k,3,XR+B,YR+H
k,4,XR,YR+H
A,1,2,3,4
ESIZE,H/10
MSHAPE,1
AMESH,ALL
DL,1,,HEAD,H*10.0
DL,3,,HEAD,H
/SOLU
~LPSOLVE
/POST1
file,file,seep
SET,LAST
~WTSLP

! -------------------------------------------------------------------------------------
! STRUCTURAL ANALYSIS
! -------------------------------------------------------------------------------------
FINISH
~CFCLEAR,,1
~UNITS,,FORC,KN
NomFile='CFVR3703'
/TITLE, %NomFile%, Effective stresses

/DFLAB,1,UX
/PREP7
~CFMP,1,LIB,SOIL,,MH
~CFMP,1,DatGen,RHO,,1000
ET,1,PLANE42,,,2   ! Structural Solid
! Rectangle B*H
H = 10
B = 5
! Relative location of the rectangle
XR = 0
YR = 0
K,1,XR,YR
K,2,XR+B,YR
k,3,XR+B,YR+H
k,4,XR,YR+H

A,1,2,3,4
ESIZE,H/10
AMESH,ALL

/SOLU
DL,1,,UY,0
DL,2,,UX,0
DL,4,,UX,0

ACEL,0,10,0
SOLVE

/POST1

SET,LAST
PLNSOL,S,Y

~EFFPRES,Y
PLNSOL,S,Y
NSEL,S,LOC,X,0

! -------------------------------------------------------------------------------------
! DATA CHECK
! -------------------------------------------------------------------------------------
! Data comparison number
  NComp    = 11
  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

! Correct data, obtained data
! -------------------------------------------------------------------------------------
*DIM,VNodes,ARRAY,11
*DIM,SMED,ARRAY,12
*DIM,SNOD,ARRAY,11
*DIM,UNOD,ARRAY,11

*DO,II,2,11
  ! Gravity stress at intermediate Points (CENTROIDS)
  SMED(II) = (10*(II-2)+5)*1000
*ENDDO
SMED(1) = SMED(2)
SMED(12)= SMED(11)

*DO,II,1,11
  ! Interpolation to nodes
  SNOD(II)= (SMED(II)+SMED(II+1))/2.0
*ENDDO

*DO,II,1,5
  unod(ii)=0.0
*enddo
*DO,II,5,11
  ! Pore pressures
   UNOD(II)=10*(II-5)*60./6.
*ENDDO
*DO,II,1,11
  ! Interpolation to nodes
  VALUE(II,1)= ABS(SNOD(ii))-UNOD(II)
*ENDDO

VNodes(1) = 17,22,23,24,25,26,27,28,29,30,1
*DO,II,1,11
  *GET,VALUE(II,2),NODE,VNodes(II),S,Y
*ENDDO

! Labels
! -------------------------------------------------------------------------------------
*DO,II,1,11
   LABEL(II)  = 'P%II%'
*ENDDO

! Warning and error tolerances
*DO,II,1,11
  TOLER(II,1) = 50
  TOLER(II,2) = 50
*ENDDO

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

Results

LabelTargetCivilFEMRatioTolerance
P1 5000 50001.000 50
P2 10000 100001.000 50
P3 20000 200001.000 50
P4 30000 300001.000 50
P5 40000 400590.999 50
P6 49900 500490.997 50
P7 59800 600390.996 50
P8 69700 700290.995 50
P9 79600 800200.995 50
P10 89500 900100.994 50
P11 94400 950000.994 50


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