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Dear fmk,
is it possible to get modal mass participation ratios after an eigen analysis?

Thank you so much for your kind response

Thankyou for your kind response, i actually start to get positive values on the 3rd time step and i think that's elastic too because cracking doesn't start that early stage....so the possibility seems to be the gravity analysis as you have pointed out.... but why would there be negative shear due to...

one more question please, if i apply monotonically increasing lateral loads on my infilled frame and at every time step extract the result for shear in cols, what i am getting is a slight negative values on the first time step ( which is the elastic shears) and later as the load increase they become...

no it is not.....

thanks for your response, but this explanation is acceptable for bottom story as also verified by my calculations where the total force at col base plus the horizontal component of the axial force in strut adds up to total base shear... but again what about the upper stories where the forces from st...

Define cross-section for nonlinear beam # ------------------------------------------ # set some paramaters set BeamWidth 150 set BeamDepth 600 set cover 40 set As 113.1; # area of 12mm bars # some variables derived from the parameters set y2 [expr $BeamDepth/2.0] set z2 [expr $BeamWidth/2.0] section...

Dear all i am modelling an infilled rc frame using a truss for infill... im doing pushover analysis....when i compare my local forces for columns the sum of total shear force in the column base does not come equal to total base shear.......but if sum shear forces at the base of columns for bare fram...

I am getting it from the element

hello everybody, I am a little perplexed with the results of my pushover..if at a same time step i check my shear forces at the base of col for a single story one bay rc infilled frame... they come out to be colv1=31.16kn and colv2=45.48kn whereas if i extract results at the nodes for base shear it ...

DEAR ALL, As i do pushover analysis of a single story one bay RC frame, if for the lateral load i apply a force of 10N the pushover for the frame is different as compared to a 1 mm reference displacement applied at the same node using sp command...also both the analysis are displacement controlled t...

Dear all, i am trying to do pushover analysis for a seven story rc frame using truss element as an infill.....but the results im getting doesnt show that the infills break...although for lower story frames the infills break and then the frame act as a bare frame....even if i compare my results with ...

Dear fmk, i want to run dynamic analysis on a structure such that scaling factor changes automatically and analysis runs again and again until all ground motions are done and their outputs saved in respective files....is that possible? how ? can someone share with me any related script... Thankyou....

here's a pic to explain the problem better....
https://drive.google.com/open?id=0BxvVI ... Wd3UDJ5M00

Dear all, i am trying to do pushover analysis in opensees of a one bay one storey RC frame... i have done a similar analysis using seismostruct.....the pushover that i get has a stiffer pre-cracking branch n then a slightly lower stiffness branch which is prudent....similarly when i am doing pushove...