CFVR1610 - Terrain weight acting on 2D Beams

Weight of a terrain acting on a 2D Beams structure.

A terrain surrounds a structure made up of 2D beam elements. The purpose of this example is to apply the equivalent loads of the terrain on the structural model.
The structure is a half frame with inclined walls as shown in the figure, with a total height
The terrain is defined by a single soil material with the following parameters:

Friction angle between the ground and wall: 31º
Slope angle of the ground: 10º
Uniform surface load on the ground per unit of slope length: 0.1 Tn/m²
Ground level: 5.0 m measured from the bottom of the structure
Water table level: 3.0 m measured from the bottom of the structure
Porosity: 0.3
Dry specific weight 2.0 Tn/m³
Internal friction angle: 31º

Active pressure is applied.

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

Terrain

Model Statistics
Number of elements	2
Number of nodes	3
Number of civil materials	2
Number of cross sections	1
Number of shell vertices	0

Log file: CFVR1610.DAT

! DESCRUPTION: of 2.0 m.
  FINISH
  ~CFCLEAR,,1
  NomFile='CFVR1610'
  /TITLE, %NomFile%, Terrain weight on 2D Beams
  ~CFACTIV,GETC,Y ! Geotechnical module activation

! ---------------------------------------------------------------------------------
! Model definition
! ---------------------------------------------------------------------------------
! Civil Setup
~UNITS,,LENG,M
~UNITS,,TIME,S
~UNITS,,FORC,MP

/PREP7 ! Preprocessor
  ET,1,Beam3

  ~CFMP,2,LIB,CONCRETE,EC2,C25/30

  ~CSECDMS,1,REC,2,1,1
  ~BMSHPRO,1,BEAM,1,1,,,3,1,0

  N,1,0,0
  N,2,0,1
  N,3,0.5774,2
  E,1,2
  E,2,3
  EPLOT
  /IMAGE, SAVE, %NomFile%,BMP

  DELTA= 31        ! Friction angle between the ground and wall, in degrees
  BETA=  10        ! Slope angle of the ground, in degrees
  Q=      0.1      ! Uniform surface load on the ground per unit of slope length
  EAKCN=  0        ! Reference number of the coordinate system in which the ground is defined
  EAH=    5.0      ! Ground level next to the wall
  WKEY=   1        ! Code identifying the influence of the water
  WH=     3.0      ! Water Table
  ~CFMP,1,LIB,SOIL,,SW
  ~CFMP,1,SOIL    ,N       ,,0.3
  ~CFMP,1,SOIL    ,GAMD    ,,2.0
  ~CFMP,1,SOIL    ,PHIMCEFF,,31
  ~TERDEF,1,NEW,2,EAKCN,Y,EAH,BETA, Q, WKEY, WH, Terrain 1
  ~TERDEF,1,LAYER,1,1,1.0,0,CLMB,DELTA
  ~TERDEF,1,LAYER,2,1,2.0,0,CLMB,DELTA

  ~ETHSFE,1,WGH,1,1.0,1.0   ! Terrain Weight Pressure

! ---------------------------------------------------------------------------------
! DATA CHECK
! ---------------------------------------------------------------------------------
! Data comparison number
  NComp = 4
  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) ='Pn1'
  LABEL(2) ='Pt1'
  LABEL(3) ='Pn2'
  LABEL(4) ='Pt2'

! Correct Values
  VALUE( 1,1)=  3.000
  VALUE( 2,1)=  0.000
  VALUE( 3,1)=  3.675
  VALUE( 4,1)= -2.901

! Obtained values
  *GET,VALUE(1,2),ELEM,1,PRES,1
  *GET,VALUE(2,2),ELEM,1,PRES,2
  *GET,VALUE(3,2),ELEM,2,PRES,1
  *GET,VALUE(4,2),ELEM,2,PRES,2

! Warning and error tolerances
  *DO,I,1,NComp
    TOLER(I, 1)= 1E-2   $   TOLER(I, 2)= 1E-2
  *ENDDO

! ---------------------------------------------------------------------------------
! Results Comparison
! ---------------------------------------------------------------------------------
  COMPARA.MAC

Results

Label	Target	CivilFEM	Ratio	Tolerance
Pn1	3	3	1.000	0.01
Pt1	0	-4.8986e-016	0.000	0.01
Pn2	3.675	3.6752	1.000	0.01
Pt2	-2.901	-2.9013	1.000	0.01

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