Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Stiffness modifier for insulation panel in ETABS 1
- Thread starter ak.t
- Start date
Not sure what thermal U-values have to do with the price of eggs in China...
In any case, sounds like you're looking to model 'load distribution panels.' CSI Guidance
Few options here:
1) Use null shells, as per link above.
2) Use a thin shell if you need it to be meshed or a membrane if you don't. Make it say 1mm steel plate. Reduce axial membrane stiffness to 1e-5 so it doesn't contribute to lateral stiffness. You couldn't even back calculate what the equivalent steel plate thickness is to account for the weight of the insulation panel (~0.25 kPa = ~3mm steel plate). Reduce bending stiffness in one direction to simulate one-way load distribution.
In any case, sounds like you're looking to model 'load distribution panels.' CSI Guidance
Few options here:
1) Use null shells, as per link above.
2) Use a thin shell if you need it to be meshed or a membrane if you don't. Make it say 1mm steel plate. Reduce axial membrane stiffness to 1e-5 so it doesn't contribute to lateral stiffness. You couldn't even back calculate what the equivalent steel plate thickness is to account for the weight of the insulation panel (~0.25 kPa = ~3mm steel plate). Reduce bending stiffness in one direction to simulate one-way load distribution.
- Thread starter
- #3
AkshikaS,
For the cross-section that you have added, the stiffness modifiers should resemble the way the structure behaves.
Modifiers I would be thinking something like:
Membrane, mass & weight modifiers no more than 0.75 of modifier that would be applied for a 200thk wall (150mm / 200mm).
Bending modifiers even further as you have two thin panels instead of 1 insitu panel. 0.1 of modifier that would be applied for a 200thk wall. (65^3+85^3)/200^3.
For the cross-section that you have added, the stiffness modifiers should resemble the way the structure behaves.
Modifiers I would be thinking something like:
Membrane, mass & weight modifiers no more than 0.75 of modifier that would be applied for a 200thk wall (150mm / 200mm).
Bending modifiers even further as you have two thin panels instead of 1 insitu panel. 0.1 of modifier that would be applied for a 200thk wall. (65^3+85^3)/200^3.
- Thread starter
- #5
-
1
- #6
- Thread starter
- #7
- Status
Similar threads
- Question