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Dynamic Analysis
RAM Frame
eigensolution
Modal calculation
mode shape
nodal loads
period calculation
RAM
RAM Elements
RAM SS
RAM Structural System
reduced stiffness
Response Spectrum
response spectrum analysis
ritz vector
scale factor
seismic analysis
Seismic loading
Controlling Fundamental Building Period
John Gervais
I am running the seismic analysis for a 3 story structure and have questions about how to determine the appropriate building period to use for the seismic analysis. Gravity system is typical steel frame, with composite slab/framing at 2nd and 3rd Floors…
Answered
over 2 years ago
RAM | STAAD | ADINA
RAM | STAAD Forum
RAM Frame Dynamic Analysis Criteria
Joseph Donato
When performing a dynamic analysis for Response Spectrum in Ram Frame, is it correct to check the reduced stiffness for steel members in the criteria? I have a situation where I need to scale up my dynamic loads to achieve the 0.85*ELF forces. The question…
Answered
over 2 years ago
RAM | STAAD | ADINA
RAM | STAAD Forum
RAM Mass Participation with Ritz Vectors
Daniel Slegh
Hello, I have been trying to use the Ritz vector solution to get 90% mass participation in my model. I have noticed something I find odd, but perhaps this there is a rational explanation for this. Running 30 eigenvalue modes the mass participation in…
Answered
over 3 years ago
RAM | STAAD | ADINA
RAM | STAAD Forum
RAM SS Merging Nodal Loads
Patrick Parton
Hello, I have a three story building with a rigid diaphragm on levels 2 and 3 (level 1 is ground). My roof is a metal deck and I want to analyze it as flexible. I created my Nodal load cases labeled Roof-X and Roof-Y, both Seismic Load type. I need…
over 4 years ago
RAM | STAAD | ADINA
RAM | STAAD Forum
RE: Determine Building Period with Ram Elements and/or Ram Structural System
Seth Guthrie
Both programs do it. Our Dynamic analysis FAQs should get you started: RAM Elements Dynamic Modal Analysis FAQ RAM Frame - Dynamic Modal Analysis FAQ
over 7 years ago
RAM | STAAD | ADINA
RAM | STAAD Forum
RE: RAM SS - Response Spectrum Analysis according to AS1170.4
Seth Guthrie
Regarding the scale factor, what we usually tell people to do is scale the dynamic load by Ie/ R, then check the base shear and compare to the lower bound limit of .85* ELF approach, and re-scale if the dyn result is too low. communities.bentley.com…
over 7 years ago
RAM | STAAD | ADINA
RAM | STAAD Forum
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