Mass Model Generator in STAAD for seismic analysis

[@harsh-kansara-11]

sir, is it necessary to define earthquake load first in load cases and then dead and live loads are defined?

[@Torq123]

Yes, its is necessary to define the static seismic load case first

[@harsh-kansara-11]

@@Torq123 what if in command file, i have pasted earthquake first even though load case number for DL and LL is 1 &2 respectively. will it work?

[@nooranistores8015]

Sir, please make a detailed and in depth video on non linear time history analysis of structures, as it is very difficult to apply various parameters of non linear time history analysis in staad pro.

[@Torq123]

Thanks for your comment. NL Time History is not yet implemented in Staad . Time History analysis is Staad is based on the modal analysis which based on superimposition principles ( linear) .. However , one can do Response spectrum analysis in conjunction with Geometric NL analysis like Pdelta analysis by Geometric stiffness based approach . I have already created a video on the same in my channel . You may visit the same .

[@nooranistores8015]

@@Torq123 sir, is it correct approach to conjunct analysis method as a non linear(like geometric non linear) and seismic analysis as a linear method (modal time history analysis)?

[@Torq123]

We can do GNL in conjunction to the dynamic analysis .Essentially, under this scheme, the program converts the non linear path into a equivalent linear condition by (k+Kg ) matrix and directly solves then rather doing iteration... 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

[@Torq123]

@@nooranistores8015 Please watch this video for more detail...th-cam.com/video/3fhjVEXfP88/w-d-xo.html

[@fazalarju]

Does STAAD perform base shear scaling automatically or we should do it manually. Please inform sir

[@Torq123]

If you mean by base shear comparison which are determined by status seismic and dynamic analysis and apply that as scaled factor for response quantities then yea Staad does it automatically.

[@fazalarju]

Sir, without creating reference load can we assign diaphagm

[@Torq123]

You can still define diaphragm but only with Master-Slave ( zx) option. For direct floor diaphragm option, you must have to define Reference Load.

[@fazalarju]

@@Torq123 thank you sir. in other wards, it is better to define reference DL ..R1 ,LL..R2 load and assign DL LL as ref 1.R1,0.5 R2 then utilise create mass model and assign diaphargm. is it correct way sir

[@Torq123]

@@fazalarju yes

[@Torq123]

@@fazalarju yes you need to define the ref load with dead and live and designate the load type as MASS and then it will be used as Mass Modeling..