09-06-2010, 07:57 PM
Hi abouferass88,
Infill wall (commonly for masonry or brick) can be practically treated as a bracing element (compression-only element with moment released or pinned)). There are 2 ways in modelling a limit state of infill wall element for pushover analysis using SAP2000:
1) using tension/compression limits
2) using hinge element
tension/compression limits:
a- create a bracing by clicking draw frame/cable element, adjust moment release to be pinned
b- specify the section (see the code for defining the equivalent section's depth of wall)
c - select bracing element> Assign > Frame > Tension/Compression Limit > enable Compression Limit and specify the compression strength of your wall
d- drawback of this way is the plastic hinge progress can not be monitored (visualize) after the analysis. If you want to see the hinge progress, use the hinge element
hinge element:
a- to b- are the same as aforementioned
c- Define > Section Properties > Hinge Properties > Add new properties > User Defined > Force Controlled (Brittle) > Axial Force > Specify the yield force using User specified force > Specify the acceptance criteria (will not affect the result but will help us to see the hinge progress in colorful dots)
d- Specify the hinge position by select the bracing element> Assign > Frame > Hinges > select hinge property > add 0 and 1 for relative distances (hinge at both members end)
P.S. If you can define the force-deformation curve of the infill wall, you can use hinge element with Deformation Controlled (Ductile) so that the hinge progress can be set-up in deformation manner as well.
Hope it helps :mail1:
Regards,
adekajeng :JC_handshake:
Infill wall (commonly for masonry or brick) can be practically treated as a bracing element (compression-only element with moment released or pinned)). There are 2 ways in modelling a limit state of infill wall element for pushover analysis using SAP2000:
1) using tension/compression limits
2) using hinge element
tension/compression limits:
a- create a bracing by clicking draw frame/cable element, adjust moment release to be pinned
b- specify the section (see the code for defining the equivalent section's depth of wall)
c - select bracing element> Assign > Frame > Tension/Compression Limit > enable Compression Limit and specify the compression strength of your wall
d- drawback of this way is the plastic hinge progress can not be monitored (visualize) after the analysis. If you want to see the hinge progress, use the hinge element
hinge element:
a- to b- are the same as aforementioned
c- Define > Section Properties > Hinge Properties > Add new properties > User Defined > Force Controlled (Brittle) > Axial Force > Specify the yield force using User specified force > Specify the acceptance criteria (will not affect the result but will help us to see the hinge progress in colorful dots)
d- Specify the hinge position by select the bracing element> Assign > Frame > Hinges > select hinge property > add 0 and 1 for relative distances (hinge at both members end)
P.S. If you can define the force-deformation curve of the infill wall, you can use hinge element with Deformation Controlled (Ductile) so that the hinge progress can be set-up in deformation manner as well.
Hope it helps :mail1:
Regards,
adekajeng :JC_handshake:
.