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Large mat foundations are usually modeled using plate elements and the boundary conditions at soil – foundation/structure interface is idealized using winkler springs assigned with sub-grade modulus of soil (using plate mat with compression only springs in STAADPro to establish and take into...

ok Got it. I am going to perform Steady State Analysis and set the output option to show displacement values at the bearing locations for different frequencies. I hope Turbine vendor will agree Thanks for the help. Always appreciate Sunny

Dear All Greetings !! I am analyzing a Table Top Foundation for Steam Turbo-Generator. Steady State harmonic analysis in Frequency domain is being carried out using SAP2000 software for vibration response. For the analysis of the equipment, the equipment supplier has asked for dynamic...

@ Stressed. : I appreciate you took time out to review the file and the suggestion. Finally i switched to STAAD for static analysis , however i shall explore more about the same in SAP. Thanks once again. :)

@ AP92 : If possible please share your SAP File. i would like to check

@Germandsc : How did you infer it uses m*(Lx^2+Ly^2)/4 mass moment of inertia by formula is m*(Lx^2+Ly^2)/12. Even i am interested to know more.

Attachment as below. Test 1m x 1m mat with simple load to ensure uplift case. I try to redistribute bearing pressure http://files.engineering.com/getfile.aspx?folder=382afa44-9980-452c-9249-a5afe041a257&file=20140918_TEST.sdb

@JoshPlum & @Stressed: I finally took the results of Response Spectrum and applied the loading as a Static Case. Also for the uplift case i applied GAP element concept. However now i have another problem. I analyzed a small 1m x 1m mat with GAP link. The problem is AFter redistribution SAP...

@Stressed :: I understand RSA is a linear analysis.. and this is the reason when you try to convert a load combination with seismic to a non linear load case. SAP converts all load cases except the Seismic ones which are later linearly added back in the load comb,. But i am really confused how...

It is a STG table top foundation in which RSA needs to be performed since it is in very high seismic zone So basically two different issues i have 1. RSA results to be applied with sign in the combinations : - for which the above query and. 2. To use compression only springs in order to...

thread801-360032 Dear All In continuation to the above listed thread. I am encountering another problem while performing response spectrum in SAP2000 I am analysing a Mat foundation in SAP DF is a load case with Dead load and SY is for response spectrum in Orthogonal Y direction. However the...