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Thanks. Could you please recommend a book covering the nonlinear finite element? Equation (3.2) in your thesis looks so abstract for me that I would like to read something with examples. In opensees, for static analysis, there are load control, displacement control, arclength control, etc. methods t...

The integrator commands construct an integrator object, by which the system equation is to be solved.
I would like to read more about this topic. Would anyone like to recommend some references? Thanks.

It might be because of the way how the model is defined. In this example, the steel01 is defined by moment and curvature relationship. So I checked these two variables at section 1 (node i), as shown in: [img]http://picasaweb.google.com/lh/photo/mHYnJvC4Ciyx87YXYA4q2w?feat=directlink[/img] It is exa...

Example2b.Canti2D.InelasticSection.Push When I ploted restoring force vs. displacement at node 2, I found the stiffness decreased around 302 kip because of yield. However, it decreased for a 2nd time around 364 kip, corresponding to a displacement of 18 in. In this example, steel01 is used to model ...

[quote="silvia"]you don't use the patch to define the bars, you use it to define the concrete. please review the manuals.[/quote] ok. the subdivisions defined in the patch command has nothing to do with reinforcement. It is a parameter defining how many I divide the patch like how many ele...

[quote="silvia"]the subdivisions define how many subdivisions you want for each direction of the patch. one large fiber does not give you as accurate an integration as many fibers. too many fibers slow down your analysis too much.[/quote] Thank you. Ok. Dose the number of subdivisions have...

I have spent several hours on reading the user manual and examples. But I did not feel confident with my understanding of those materials. So I would appreciate your help on reading this file and point out where is wrong.

Hi Because there is no way to put picture here. I put my questions together with a figure to a pdf file. Would you help to check this out and do me a favor? Thanks a lot. I have spent several hours on reading the user manual and examples. But I did not feel confident with my understanding of those m...

Thank you

silvia wrote:please review the command language manual.

I could not find help from reading the manual. So I post it here for help. Thanks.

Ex9c.build.RCSection.RectUnconfinedSymm2D.tcl set numBarsSec 4; set nfY 16; set nfZ 4; section fiberSec $SecTag {; patch quadr $IDconcU $nfZ $nfY -$coverY $coverZ -$coverY -$coverZ $coverY -$coverZ $coverY $coverZ; layer straight $IDreinf $numBarsSec $barAreaSec $coreY $coreZ $coreY -$coreZ; layer s...

I did example 4, portal 2DElasticElement frame uniform dynamic analysis. The output does not make sense to me. The base shear forces are saved to RBase.out. 0.01 98.9524 1999.99 0 -98.964 2000.01 -7.27596e-012 why is the shear force at column 1 positive while the one at column 2 is negative? Since ...

Hi I am a newbie of OpenSees and get several questions. 1, quadrilateral patch command. patch quad $matTag $numSubdivIJ $numSubdivJK $yi $zi $yj $zj $yk $zk $yl $zl There is an example in the Command Language Manual of this command. patch quad $coreMatTag 8 8... It says that this defines a core patc...

Hi
The maximum duration of earthquake is 50s. Is there any way to exceed this limit? Say, I wanna a 100s ground motion to be analyzed.
Thanks.

The following code is part of example 6, by which I want to change one column section. In the end I try to insert the weight of level 2 into the floorweight list which already contains floorweight from level 3 to level 13. By puts the length of the list, I found it does not change at all. Why is tha...