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Period of a structure is related to the mass and stiffness. you can change the period by changing the mass or stiffness.

model basic -ndm 2 -ndf 3 file mkdir static file mkdir dynamic node 1 0 3.81 node 2 0 3 node 3 0 2 node 4 0 1 node 5 0 0 node 6 0 -0.1 node 7 0 -1.1 node 8 0 -2.1 node 9 0 -3.1 node 10 0 -4.1 node 11 0 -5.1 node 12 0 -6.1 node 13 0 -7.1 node 14 0 -8.1 node 15 0 -9.1 node 16 0 -10.1 node 17 0 -11.1 n...

Yes. You are right about the old versions of OpenSEES. The ucsd materials only work properly in the old version (1.7.1) of opensees, and in the new versions the output files are 0Kb. I've written a code that includes update material stage and I think it might help you. #plane strain, shear-beam type...

for pysimple elements you can contact Dr.Boulanger of university of california at Davis. for PDMY elements you can go to university of san Diego where there is a lot of examples available in there. you can also contact Dr.Jeremic for the PDMY Elements.

You can see the buckling in a column by using a nonlinear beam-column and giving it an imperfection of say L/1000 which L is the length of the column. you also have to use corotational geotransformation option instead of P-delta and linear.with these discriptions you can see a member buckling.

Hi,

Do you change the number of dimentions when you use these two elements. you have to have two separate model builders for using these two elements together in a code.

Hi,

You can use more elements at the point that you want your results and then use the global force recorder for a Particular element. direction 2 is the shear force in the data given by this recorder.

I think the results you got from the analysis is right. the more displace ment you put on the frame the base shear gets larger. it is better to use Steel02 material with the corotational transformation.

I've done pushover analysis on piles with no problem. I have to see your model to tell you what is wrong with it. you have to define a zero-length element on every node of your pile(one node is fixed and the other one is connected to the pile). for seeing p-y curves in every depth you have to have t...

We are using Pressure dependant multi yield materials. I got the stress strain recorders in version 1.7.1 with no problem. but they do not work with the new versions.

the following recorders have some problems when opensees 1.7.3 is used. the output for these recorders does not have any information and it is 0Kbs. these recorders only work in 1.7.1 version. recorder Element $ele -time -file $name11 material 1 stress recorder Element $ele -time -file $name22 mater...

you have to run this recorder in opensees version 1.7.1. it will not give an answer in new versions. I don't know why!

You have to install tcl/tk first or else the opensees program will not work. may be the tcl program is not downloaded properly. try downloading it again. I have installed this version of tcl on windows vista without any problems.

This method is given to the program by the transformation command. it is even better to use corrotational command for nonlinear analysis. this method is faster. for more information you can read some finite element books like Bathe or wilson.

IDA analysis is a new method that can be done with any finite element program. You just have to make your model, and then run some nonlinear dynamic analysis with different scales. for more information you can read vamvatsikos's phd thesis which was about IDA in stanford university.