Difference between revisions of "Contrib:KeesWouters/shell/static"

Revision as of 12:43, 7 March 2010

Static analysis of a shell construction

[ .... under construction .... ]

This contribution is in close cooperation with Bridge.

In this example the following items are discussed:

• preproccesing:
• definition of geometry in Salome
• partitioning of the geometry and groups
• meshing of the geometry
• definition of the groups
• (maybe: python script which makes editing much easier ...)

• static analysis with pressure or force applied on a group or nodes

• postprocessing:
• viewing displacement in Salome
• determination of stresses

• interface ASTK

Definition of the geometry

planar shell Geometry:
L = 11.38 m
Thickness = 0.55 m
Loads:
[type] [group] [value]
Presure1 (Fbot) = 29.5e3 Pa
Presure2 (Fmain)= 25.8e3 Pa
Presure3 (Ftop) = 24.3e3 Pa
Presure4 (Fcentre1,Fcentre2)= 182.6e3 Pa
BC:
Lbot (DX=0.0, DY=0.0, DZ=0.0)
Ltop (DZ=0.0)
Material:
Concrete
E = 32e9 Pa
Nu = 0.2

Create all points and lines using: [New Entity]->[Basic}->[Point] and [New Entity]->[Basic]->[Line]

Create one big face Ftotal
[New Entity]->[Build]->[Face]
Ftotal: Line7,Line6,Line8,Line12,Line11,Line10,Line9,Line1

Create three wires
[New Entity]->[Build]->[Wire]
Wire1: Line3,Line4,Line5
Wire2: Line17,Line18,Line19
Wire3: Line13,Line14,Line15,Line16

Create vector
[New Entity]->[Basic]->[Vector]
(0,0,1)
Create four extrusions
[New Entity]->[Generation]->[Extrusion]
Extrusion1: Wire1,vz
Extrusion2: Wire2,vz
Extrusion3: Wire3,vz
Extrusion4: Line2,vz

Partitioning of the geometry

why: we need groups for loads and boundary conditions
how: we define planes

Create partition
[Operations]->[Partition]
Part_main: Ftotal,Extrusion1,Extrusion2,Extrusion3,Extrusion4

Meshing

how
tria -quad?
linear vs quadratic elements

ASTK - Aster

Postprocessing

displacements

local stresses

equivalent stresses