The OpenSees Community

Dear fmk: Thank you so much for your detailed answer.I wanted a diplacement control pushover analysis,instead of a target displacement only at roof,I defined several target displacements at each story.in this case I use sp command to push the structure to the predefined target displacements. As you ...

# Units: ton, m #5 story-3 bay building model BasicBuilder -ndm 2 -ndf 3 set b 18.0; #frame length set h 3; #Model height set m1 2.059633028; #((3.3+0.2*1.2)*18)/(9.81*4))+(Story Weight1,2/(9.81*4)) for each node #External (DL+LL) + Story Distributed Dead Load) set m2 1.978695209; #((3.3+0.2*1.2)*18...

Dear fmk, I am proud that a knowledgeable doctor like you reply me soon. I tried smaller steps and also modifiedNewton test,but still the problem remains. These are warnings: Starting OpenSees.. WARNING: CTestNormDispIncr::test() - failed to converge after: 20 iterations ModifiedNewton::solveCurrent...

Should I use :constraints Penalty $alpha SP $alpha MP for applying gravity load?If so,What are the value of $alpha SP and $alpha MP?

Hi Dear Silvia,
When I use sp command rather than loading in pushover analysis,after applying gravity load,I have convergence problems,but when I delete gravity load it become works.What should I do?Should I change any parameter in gravity load???Change any test???

Dear Dr.Silvia:
How can I record the plastic rotation at the both ends of an element?

Thanks dear Silvia

Hi Dear Dr.Silvia, I want to know how I can push a structure to multiple target displacements.For example,when I have a 5 story structure,I have 5 target displacement for each story.How should I limit each story to a specified target displacement in the case that with changing the direction of later...

Hi, I want to know how I can push a structure to multiple target displacements.For example,when I have a 5 story structure,I have 5 target displacement for each story.How should I limit each story to a specified target displacement in the case that with changing the direction of lateral load that no...

Dear Dr. Silvia:
I did pushover analysis with SAP and OPENSEES.Should my capacity curves(Base shear vs. Displacement) be the same in both procedures?and with the same results(for example the maximum base shear)

Thanks dear Silvia...

I am using nonlinear beam-column element with fiber section.Am I allowed to use this record?

Dear Silvia:
When I use this record:
recorder Element -xml ele1local.xml -time -ele 1 plasticRotation
It won't be opened and when I open it with excel it is empty.What is my problem?Can I use *.xml for any record?My version is 2.0.0
Thx a lot

Dear Dr. Silvia:
I doubled the fiber numbers from 20 to 40 and also increased displacement increment.Now it works without any convergence problems.Thank you so much

Dear Dr.Silvia: I did a pushover analysis on a 2D concrete frame.At the end of analysis the following warnings were emerged,but it is written that my analysis is done.What is my problem?What should I change?I used nonlinear beam-column with fiber section.Thanks dear Dr.Silvia. Regards Number of Stor...