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I created a new material in OpenSees, and I wanna update one of its parameter during analysis. When I try this on a simple structure consist of just one zeroLength element like


element zeroLength 1 1 2 -mat 1 1 -dir 1 2
parameter 1 element 1 material 1 para1
......
updateParameter 1 0.01


It goes well. But when I use it in a more complex structure:


element zeroLength 41 24 23 -mat 11 11 -dir 1 2
...
element zeroLength 48 62 61 -mat 18 18 -dir 1 2
parameter 1 element 41 material 11 para1
...
parameter 8 element 48 material 18 para1

......
updateParameter 1 0.01
...
updateParameter 8 0.01

I get this:

Parameter::addComponent 1 -- no objects were able to identify parameter
material 11 para1
Parameter::addComponent 2 -- no objects were able to identify parameter
material 12 para1
Parameter::addComponent 3 -- no objects were able to identify parameter
material 13 para1
Parameter::addComponent 4 -- no objects were able to identify parameter
material 14 para1
Parameter::addComponent 5 -- no objects were able to identify parameter
material 15 para1
Parameter::addComponent 6 -- no objects were able to identify parameter
material 16 para1
Parameter::addComponent 7 -- no objects were able to identify parameter
material 17 para1
Parameter::addComponent 8 -- no objects were able to identify parameter
material 18 para1

Can anybody help me with this problem please?

Hello everyone,

How can I set the retained and constrained nodes of the rigid links so that the simplification shown in the following picture can be achieved?


I did it like this:

rigidLink beam 1 2
rigidLink beam 1 3
rigidLink beam 4 5
rigidLink beam 6 7
rigidLink beam 5 8
rigidLink beam 7 8

the bears are simulated by zerolength elements, equaDOF command is used：

equaDOF 2 4 3 4 5 6
equaDOF 3 6 3 4 5 6

but the response of the structure turned out to be incorrect. Can anybody help me with this?