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PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 1
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Introduction to Plaxis
presented by:
GOUW Tjie-Liong, Ir., M.Eng, ChFCSenior Geotechnical ConsultantEmail: [email protected]
Source of Lecture Notes:PLAXIS BV
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
General Modelling Aspects
Defining a project:Define geometryGenerate meshDefine initial conditionsDefine calculation phasesCalculate Inspect results
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 2
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
The geometry is the representation of the physical problem
Consists of points, lines and clusters Definition of soil layers, structural elements
and loads
General Modelling Aspects
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
General Modelling Aspects
PointsStart and end of lines. Positioning of anchorsPoint forces, Point fixities Local refinements of the finite
element mesh.
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 3
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
General Modelling Aspects
Lines Define the physical boundaries of the
geometry Define discontinuities in the geometry:
Sheet pile walls, distributed loads Separations of distinct soil layers or
construction stages. A line can have several functions or
properties
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
General Modelling Aspects
ClustersAutomatically generated enclosed areasHomogeneous soil properties.
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 4
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
(a) 6-noded triangle (b) 15-noded triangle
stress points
nodes
General Modelling Aspects
Mesh 6-noded or 15-noded triangular elements Displacements calculated in nodes Stresses calculated in Gaussian integration points
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Input Program
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 5
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
INPUT
Composing a geometry model Creating and assigning data sets Generating a finite element mesh Generating initial conditions
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Composing a Geometry Model
Graphical input of geometry contour, soil- layers, construction stages, plates, geogrids, interfaces, anchors
Designer for circular or non-circular tunnels
Input of loads and boundary conditions
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 6
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Geometry lines (between soil layers, etc.)
Plates (Walls, Plates & Shells)
Hinges (free rotation between beams)
Geogrids
Interface elements (soil-structure interaction)
Anchors (node-to-node, fixed end)
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Creating and Assigning Material Data Sets
Enter model parameters as data sets in a material data base
Assigning data sets to geometry components by means of drag and drop
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 7
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Generating a Finite Element Mesh
Fully automatic mesh generation based on geometry model
Global and local refinement options
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Generating Initial Conditions
Generating initial pore pressures by means of phreatic line or groundwater flow calculation
Flip switch - gives: Initial stresses and geometry mode
Setting initial geometry configuration Generating initial stresses (K0 procedure)
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 8
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Calculation Program
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Defining Calculation Phases
Plastic calculation, Consolidation, Phi/c reduction and Dynamic analysis.
Updated mesh. Loading input: Multipliers or Staged Construction. Changing water conditions Multiple calculation phases can be pre-defined and
executed at once.
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 9
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Output Program
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
View Results
Graphical and tabulated output of displacements, stresses and structural forces
Output in cross sections Multiple output windows can be opened
simultaneously (comparison of results)
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 10
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
First Exercise
Resume of input steps
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Input Geometry
Draw Geometry
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 11
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Input Boundary Conditions
Default fixities
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Input Loads
Point force A & B
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 12
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Input Material Properties
General properties, model parameters
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Mesh Generation
Full automatic mesh generator
PLAXIS Standard Course Universiti Teknologi Malaysia - Johor May 14-16, 2007
Presented by GOUW Tjie Liong [email protected] 13
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
Initial Conditions
Water pressures, Initial stresses
PLAXIS FINITE ELEMENT CODE FOR SOIL AND ROCK ANALYSES
GTL
See course manual