Dynamic Analysis Capturing the PDelta Effect (Non Linear) in Staad CE ||

This is a demo is for a tall building structure which is subjected to earthquake load and then undergoes PDelta Effect (Non Linear) for which engineer needs to perform the dynamic analysis capturing the Pdelta effect.. .
So we will see how to deal with this in Staad CE.
P Delta and Response Spectrum
Non Linear and Time History
P Delta and Time History
Stability Analysis and Design in Staad CE of Steel Structural . Non Linear Analysis, Linear Buckling Analysis of structure in Staad
PDelta with Dynamic Analysis
PDelta Analysis Time History
Building Dynamic analysis second order effect
#structuraldesign
#TallBuilding
#Seismic
#earthquakedesign
#StructuralAnalysis
#building
#buildingdesign
#buildinganalysis
#staad
#staadpro
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**********************************About Me**************************
I am a Senior Structural Engineer in Bentley Systems Ltd. having 16 years of experience on STAAD CE, RAM Structural Systems and other structural analysis ad design products. Also, I am having a total of 20 years of experience in various industries.
Contact : [e-mail]
LinkedIn : / biswatosh. .
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#structural engineering #staad #staadpro #aisc #buckling analysis #Finite Element # steel design

[@kanhaisoni6583]

Sir, good content 👍

[@Torq123]

Thanks

[@maheshN134]

Good content sir, I think e tabs is better for including p-delta effects, however results are same, but etabs task is easy

[@Torq123]

Thanks for the comment.

[@sunnybaggu785]

Can you please share the staad file for sample

[@satyajitdey2098]

How can a non-linear system have fixed natural frequencies?

[@Torq123]

We are not doing the direct integration method to solve the geometric non linear response at every time steps ( for Time History) as in Staad rigorous method like direct integration and FNA is not available but here the program we are using the geometric stiffness method to active the final solution by modifying s the stiffness matrix directly by KG so that the modal analysis can be performed on the modified (K+Kg) matrix . This method gives good result for building like structure undergoing PDelta effect. This method is first proposed by Edward Wilson which was then implemented in many building analysis package like SAP, RAM , Staad etc

[@satyajitdey2098]

@@Torq123 I understand your approach which is what you do to solve non linear static equations but my question was - “can non-linear systems have fixed natural frequencies?”
If not, then there must be some form of approximation required to use any mode superposition method for dynamic analysis, I wanted to understand a bit more of that approximate method.

[@Torq123]

@@satyajitdey2098 Ok , I got your point now. Yeah As the geometric stiffness varies with the change in geometric shape so the NF will vary for the change in stiffness.

[@satyajitdey2098]

@@Torq123 Is it Biswa? Will catch you later to know more of the technique used, it's a very useful topic and a video indeed!

[@godartmascaro89]

? ???????

[@Torq123]

Please explain your query