Performing Response Spectrum Analysis Using Ansys Mechanical — Lesson 1

Response spectrum is a mode superposition linear analysis that uses the results of a modal analysis with a known spectrum to calculate displacements and stresses in the model. Three types of input excitation spectrum are supported: displacement, velocity, and acceleration.  The mode coefficients are calculated by the program from the modal analysis participation factors and the spectrum values, and this is used to combine the modal responses to estimate the overall peak response; there is no deformed shape nor output as a function of time or frequency.

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0:00 - Intro
00:16 - What is response spectrum analysis?
01:23 - Introduction of the input spectrum
01:45 - How to create a response input spectrum
02:42 - How the single-point response spectrum works
07:31 - How to choose the modes combination type
07:52 - How to apply response spectrum load

[asadabbas]

How to find spectrum values? Actually I want to calculate response acceleration, I have all other parameters but I didn't get the point how to calculated or find spectrum value

[ThePandazmr]

Hi! How can I get the stresses from combination of gravity, seismic and additional forces?

[GINOBERTOLLUCCICOLHERINHAS]

What happens if we input a non linear COMBIN39 stiffness in the Response Spectrum Analysis? Because we can see the structure response results as the one obtained using linear stiffness

[cyriljanda]

Thank you. My exam is in two days and I am lost so I hope this might help me.

[MuhammadKashif-orkm]

As per my understanding and experience, Response spectrum analysis in ANSYS does not include static load effect. Nees your guidance

[jakesta]

No discussion of scale factor, which is the least intuitive part of the analysis. Do better, ANSYS.