FOUNDATION%20ON%20ELASTIC%20SUBSOIL - PowerPoint PPT Presentation
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FOUNDATION%20ON%20ELASTIC%20SUBSOIL
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Compute the local displacements for each member Calculate the inner forces from fl = Kl ul ... Calculate the local stiffness matrix for each element Transform ... – PowerPoint PPT presentation
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Title: FOUNDATION%20ON%20ELASTIC%20SUBSOIL
1
FOUNDATION ON ELASTIC SUBSOIL
- ZAHRA SHARIF KHODAEI
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INTRODUCTION
3
INTRODUCTION
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PROCEDURE FOR FEM
- Divide the structure into nodes and elements
- Find the joint forces and initial displacements
- Calculate the end forces for each element
- Assemble the global joint forces (localize)
- Calculate the local stiffness matrix for each
element - Transform the local stiffness matrix to global
stiffness matrix - Localize to obtain the overall stiffness matrix
- Solve Ku f for the displacements u.
- Compute the local displacements for each member
- Calculate the inner forces from fl Kl ul
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EXAMPLE
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MESH
SIGN CONVENTION
Y
X
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Something about CAL
- The command to solve a grid on elastic subsoil
is - GRID km E? G? I? J? L? CW? CP? B? K?
- Where
- km element stiffness matrix
- E modulus of elasticity
- G shear modulus
- I moment of inertia
- J torsional moment of inertia
- L length of the element
- CW Winklers constant C1
- CP Pasternaks constant C2
- B width of the cross section
- K 1 takes into account the neighborhood of
the foundation
8
RESULTS
INTERNAL FORCES IN THE MEMBERS
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DEFLECTIONS
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BENDING MOMENTS
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(No Transcript)
12
COMPARISON
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(No Transcript)
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