I have performed a nonlinear static analysis in etabs for a steel braced frame. The pushover curve is linear and the model has shown any yielding. But the analysis has stopped before reaching the target displacement. I do not know why?
Please suggest what to do. Why the analysis is stopping if there is no plastic hinge formed before reaching the target displacement?
Hi Mohd Ubaid
Did you make sure that the plastic hinges are assinged to the elements? Did you make sure that the target displacements and control node are correctly assigned? What about the parameters of the nonlinear materials?
Hi Mohd Ubaid ,
Complementing Karim Aljawhari 's comment, this problem may be related to numerical convergence issues (assuming the nonlinear hinges were assigned properly). When I performed pushover analysis in ETABS, I found out that if the target displacement is unrealistic big the software stops running before hinges are formed. My suggestion is to reduce the target displacement and check if the software will at least run until the target is reached. If the software still stops prematurely, then it probably means that you have to change some of the nonlinear analysis parameters.
I hope this helps :) Good luck
Rafaela
The frame is a BRBF with X bracings.
I have assigned the plastic hinges acc to ASCE 41-17.
I am also getting the Target displacement but I want to know why the analysis is stopping before the structure collapse or there hinge formation.
I think ,the analysis should stop after the formation of hinge in the models.
is it due to the BRB provided in X configuration r anything else?
Mohd Ubaid
Can you please show the definition of hinges you implemented?
Mohd Ubaid what is the hinge in the first photo? Why it does not have softening branch?
Dear Karim Aljawhari sir,
The hinge in the first photo is an auto-generated hinge for buckling restrained bracing using ETABS for a StarBRB section. StarBRB sections are available in the ETABS database.
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