gap material

[civilso]

In case you have a material with a kink (ElasticPPGap) you can not use load command to apply the load as it will not be able to get you into nonlinear range for that material because of the kink.

this is about displacement control?
do you have any suggestion about kink?

i continue with opensees or use from another nonlinear analyze software?

[vesna]

Yes, that is about displacement control.
There is no way remove the kink from ElasticPPGap material. That is a way it is defined.

[civilso]

>That is a way it is defined.
how can i define it in opensees???

[vesna]

opensees is an open source computation platform. you can develop your own material and add it to opensees.

[civilso]

would you please tell me some suggestions or some helps or some sources to define kink and add other material to opensees?

[civilso]

would you please tell me some suggestions or some helps or some sources to define kink and add other material to opensees?

[vesna]

When I say kink I mean sharp transition from elastic to plastic region that characterizes all elastic perfectly plastic (EPP) materials. For EPP materials it is predefined.

Here you can find more information on how to develop and add new material to OpenSees:
http://opensees.berkeley.edu/OpenSees/d ... /index.php

[abazarnejad]

check your fix points and fix directions you assigned!

[abazarnejad]

Hi Dears
I need to capture stressStrain in my model(using concrete04 and steel02) but the results for concrete stress-strain is full of zeros "0".
I used this command:

recorder Element -file Data/stressstrainC.txt -ele 1 section 1 fiber 170 120 3 stressStrain;

recorder Element -file Data/stressstrainC.txt -ele 1 section 1 fiber $X $Y $MatID stressStrain;

AnyBody can Help Please!!

[vesna]

This means that you are applying a load of zero for each time step. Make sure you have defined your load and analysis objects correctly.

[mnazari]

Hi,
I have a quick question about gap material:
I have a prestressed rocking shear wall. If I want to model the rocking interface with only compression springs, is this command "uniaxialMaterial ElasticPPGap $matTag $E $Fy $gap <$eta> <damage>" exact enough to express all the compressive strains and possible damage in the concrete wall toe? Since we just need to define Fy value here and eta, which I am not sure how exactly is able to model the concrete.
Many Thanks