CFVR1605 - Active Pressure acting on shells
Active Pressure of a terrain acting on a shells structure.
A terrain surrounds a structure made up of 4 nodes shell 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: 15º
- 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: 30º
Element types used in the model: SHELL63 Needed CivilFEM Modules: |
|

| Model Statistics | |
| Number of elements | 2 |
| Number of nodes | 6 |
| Number of civil materials | 1 |
| Number of cross sections | 0 |
| Number of shell vertices | 0 |
Log file: CFVR1605.DAT
! DESCRUPTION: of 2.0 m. FINISH ~CFCLEAR,,1 NomFile='CFVR1605' /TITLE, %NomFile%, Active Pressure acting on shells ~CFACTIV,GETC,Y ! Geotechnical module activation ! --------------------------------------------------------------------------------- ! Model definition ! --------------------------------------------------------------------------------- ! Civil Setup ~UNITS,,LENG,M ~UNITS,,TIME,S ~UNITS,,FORC,MP /PREP7 ! Preprocessor ET,1,Shell63 N,1,0,0 N,2,0,1 N,3,0.5774,2 N,4,0,0,-1 N,5,0,1,-1 N,6,0.5774,2,-1 E,1,2,5,4 E,2,3,6,5 /VIEW,1,-0.8,0.9,1.1 EPLOT /IMAGE, SAVE, %NomFile%,BMP DELTA= 15 ! 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,,30 ~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,2,ACT,1 ! Active Pressure ! --------------------------------------------------------------------------------- ! DATA CHECK ! --------------------------------------------------------------------------------- ! Data comparison number NComp = 8 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) ='Pn2' LABEL(3) ='Fx1' LABEL(4) ='Fy1' LABEL(5) ='Fx2' LABEL(6) ='Fy2' LABEL(7) ='Fx3' LABEL(8) ='Fy3' ! Correct Values VALUE( 1,1)= 5.6517 VALUE( 2,1)= 6.1115 VALUE( 3,1)= 0.000 VALUE( 4,1)= -0.1776 VALUE( 5,1)= -0.1590 VALUE( 6,1)= -0.4242 VALUE( 7,1)= -0.1282 VALUE( 8,1)= -0.2220 ! Obtained values *GET,VALUE(1,2),ELEM,1,PRES,2 *GET,VALUE(2,2),ELEM,2,PRES,2 *GET,VALUE(3,2),NODE,1,F,FX *GET,VALUE(4,2),NODE,1,F,FY *GET,VALUE(5,2),NODE,2,F,FX *GET,VALUE(6,2),NODE,2,F,FY *GET,VALUE(7,2),NODE,3,F,FX *GET,VALUE(8,2),NODE,3,F,FY ! Warning and error tolerances *DO,I,1,NComp TOLER(I, 1)= 1E-3 $ TOLER(I, 2)= 1E-3 *ENDDO ! --------------------------------------------------------------------------------- ! Results Comparison ! --------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| Pn1 | 5.6517 | 5.6517 | 1.000 | 0.001 |
| Pn2 | 6.1115 | 6.1114 | 1.000 | 0.001 |
| Fx1 | 0 | 0 | 0.000 | 0.001 |
| Fy1 | -0.1776 | -0.17763 | 1.000 | 0.001 |
| Fx2 | -0.159 | -0.15902 | 1.000 | 0.001 |
| Fy2 | -0.4242 | -0.42418 | 1.000 | 0.001 |
| Fx3 | -0.1282 | -0.12817 | 1.000 | 0.001 |
| Fy3 | -0.222 | -0.22197 | 1.000 | 0.001 |
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