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Dear Prof. FMcKENNA Hi ... I am going to calculate Park-Ang damage index for 3D RC model under several seismic excitations during time history analysis. I need to know maximum deformation of each elements or members end rotation and also Force-Displacement values to obtain hysteretic energy absorbed...

I have modeled a 3D RC 3 stories structure both in OpenSEES and ETABS.
But period of structure is different !
Period of structure calculated from OpenSEES is 0.523 sec and from ETABS is 0.926 sec.
Help me if possible

Hi everybody ... My model is a 3D reinforced concrete structure. It contains 3 stories. Elements are defined as fiber sections and modeled with dispBeamColumn elements. But push over analysis doesn't converge. Help me if possible ... # -------------------- # Push over analysis # --------------------...

Dear fmk, The message is : ModifiedNewton::solveCurrentStep<> -the ConvergenceTest object failed in test <> StaticAnalysis::analyze<> -the algorithm failed at iteration 45 with domain at load factor 0.46 openSees > analyze failed , returned: -3 error flag Is it because of great loads or incorrect ma...

Hi everybody ... My model is a 3D reinforced concrete structure with shear walls. It contains 20 stories. Elements are defined as fiber sections and modeled with dispBeamColumn elements. My goal is to run time history analysis. But gravity analysis doesn't converge. Help me if possible ... # -------...

Hi everybody ...
I improved my PC's RAM from 8G to 12G & tried again.
I succeeded to run the static analysis.
Thanks to all ...

I have been used concrete02, according to your suggestion, I changed it to concrete01and ran the model again. I waited for about one and half hour but during gravity load analysis, the same message as I mentioned above is shown without error or warnings. The message is : CTestEnergyIncr::test<> - it...

My model contains approximately 776 nodes,
640 dispBeamColumn as column element,
1120 dispBeamColumn as beam element,
80 dispBeamColumn as shear wall element.

wipeAnalysis ; constraints Transformation ; numberer RCM ; system UmfPack ; test EnergyIncr 1.00e-7 25 1 ; algorithm ModifiedNewton ; integrator LoadControl 0.01 ; analysis Static ; analyze 100 ; loadConst -time 0.0 ;

I tried two system solvers : SparseGeneral and also Umfpack.
but the result was the same.
Gravity analysis takes long time for both system methods.

Hi everybody ... My model is a 3D reinforced concrete structure with shear walls. It contains 20 stories. Elements are defined as fiber sections and modeled with dispBeamColumn elements. My goal is to run time history analysis. but it takes a long time during gravity analysis without any error or wa...