The OpenSees Community

hi everybody , i want to perform a pushover analysis with unload and reloding, Is there an example of this kind of analysis? thanks a lot!

hi everyone, when i introduce a new material to opensees materail library, it warning:
"fatal error LNK1181: cannot open input file "tcl84.lib"
Error executing link.exe."
i do not know why?
who can give me some advice, thanks a lot!

hi everyone, i want to introduce a new material to opensees materail library, and when i run the .dsw file, it warning:
fatal error c1083:cannot open include file: "tcl.h":no such file or directory……
who can give me some advice, thanks a lot!

hi everyone, i want to build a damper element with negative stiffness in OpenSees, but i don't konw whether the idea is feasible, can you give me some advice? thanks a lot!

hi, everyone. I want to get the stiffness of a Fiber Section. the command is: recorder Element -file ele1sec1Stiff.out -time -ele 1 section 1 stiffness; ( element 1 is Nonlinear Beam Column Element) But, I got only "time" in the file of ele1sec1Stiff.out , without stiffness data. I don't k...

hi pejman, i have built a simple model and encounter the same question when i use the "EnvelopeNode Recorder", can i send the model to you? if you run it in opensees version 1.7.3 and version 1.6.1, and compare the results you will find the question, one file is empty but the other one is ...

Actually, I have worked with envelopnode recorder and I did not encounter any problem. I can send you some files proving it or you just build a simple model and send me to see if I can find the problem. thanks pejman, the model i built is a complicated one. so i will be very grateful if you send me...

The syntax seems to be right but you need to make sure that the analysis is completed unless your file will be empty. thank you pejman, i am sure the analysis is completed, and the file can't recorde any imformation. but if i use the opensees version 1.6.1 instead of version 1.7.3 the file could re...

hi my friends,i am puzzled about the use of "EnvelopeNode Recorder", i use this command to recorder the node displacement envelope in a transient analysis, but the file is empty, the command i use is " recorder EnvelopeNode -file EnNode.out -node 2 10 -dof 3 disp ", is there any ...

hi everyone, i want to get the displacement reaction of the midpoint of a truss element, (i have tried to divide the element to two elements,but it was defeated),anyone can give me some advice? or an example? thanks a lot!

hi everyone, i have a question about the fiber section deformation of a RC column, when the column subject to a axial force and a moment, the steel in the tension side is yield, but in compression side the steel and the concrete is in elastic still. at this state reduce the moment to zero but the ax...

hi everyone, i have a question about converge when i do time-history analysis for a simple RC-column subject to earthquake, espicially when the concrete stress exceed the maxmum strength fpc, in this case i can not get the ultimate result even i do a lot effort, who can give me some advice or some e...

are you plotting reactions or element forces? the reactions include inertias -- don't ask me why, and damping. i'd plot the element forces, you should get better results. however, isn't that what a prestressed section should behave? thanks silvia, i do plot the element force-deformation curve, and ...

hi everyone, I have done the analysis of a cable-stayed bridge under ground motions, the input is earthquake accelerations by UniformExcitation Pattern, and got the m-υ hysteresis curve of the pier at the base, but the shape of the curve is not rational, it is like a 8 shape, I don’t know why? :( Wh...

thank you srisri_iitk, i see what your means, but what about the shell element ? if i can use the shell element to simulate the concrete plane.