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Dear all i have modeled SAC9 steel model. the modal periods are the same as experimental results but during the static analysis, the compatibility error happens and the model does not converge. please send me some advice about the error. #Units: N, m wipe; model BasicBuilder -ndm 2 -ndf 3; # define ...

Dear all hi I model 2d frame and run a nonlinear analysis for a prescribed ground motion. After all, I would like to calculate 4 part of input energy (kinetic, damping,elastic strain and hysteresis). So is there any way to calculate history of hysteresis and damping energy by Opensees?. I am familia...

Dear all I run a 10 story model under acceleration time history with dt=0.02 sec (nonlinear analysis). I select dt of analysis output 0.005, 0.01 and 0.02 sec. But the results are different. I also read the below post but it does not work for me. So my question is clearly which of three results is c...

Dear all i need to find maximum base shear of SDOF via nonlinear time history analysis. IN one hand, I use this recorder recorder Node -file reac1.out -node 1 -dof 1 reaction In other hand, I read the relative acceleration on top node of SDOF by this recorder : recorder Node -file acc-NTHASN1.out -n...

Dear all H I have modeled a series of MDOF 2D frames with nonlinearbeamcolumn and elasticbeamcolumn to do inelastic and elastic time history analysis. But as I checked the first period of each models, there is an approximate 25% difference between one which is resulted from using nonlinear element a...

Hi I am using nonlinear-beam column to model distributed plasticity. by using basic deformation i think the ultimate end rotation is reported. hence elastic rotation would be basic deformation minus plastic deformation. if this statement is not correct please someone help me to calculate ultimate en...

Dear all in the below text (part of code) how can calculate th_p_col1 and th_pc_col1 and Lambda_col1? ################################################################################################### # Define Rotational Springs parameters Of Plastic Hinges, Panel Zones, and Leaning Columns #######...

dear Vesna Hi, thanks for your reply. May i ask you to help me how can calculate the ultimate rotation of beam and columns by chord rotation results? I am really confused about this subject. As i see in some posts users tell if the ultimate chord rotation is required it is better to use plastic hing...

Dear all as demand rotation ductility of beam and columned is the ratio of ultimate rotation to yield rotation of beam or column, my question is if we choose nonlinear beamcolumn element (force deformation) with which command Opensees reports beam and column ultimate rotation? I know the definition ...

dear fmk i used this element for example to model column: element nonlinearBeamColumn 1 1 2 5 1 1 -iter 1000 1.0e-1 and i decide to calculate maximum absolute rotation of column at both end in different stories with nonlinear time history analysis. because i would like to calculate column rotation d...

HI What is deformations in below command : recorder Element -file ele7sec1Defo.out -ele 7 section 1 deformation is it rotation (rad) or something else? I am looking for end beam and column element total rotation(plastic and elastic) in rad. i used nonlinearBeamColumn element for distributed plastici...

Hi I have modeled a 2 story building with nonlinearBeamColum. after pushover analysis i need the rotation of beam and column at specified section. How can find it? i put this command: recorder Element -file ele1sec1Defo2.out -ele 7 section 1 deformation but i think above deformation in section 1 is ...