November 22, 2021 at 4:44 pm

peteroznewman

Subscriber

Earthquake data sampled at 0.01 seconds is a sampling frequency of 100 Hz, which means you should not look at frequencies above 40 Hz.

Earthquake data is recorded by accelerometers. Do you have the original acceleration vs time data?

You should compute the Shock Response Spectrum for your earthquake data and see what frequency has the largest response. I can do that if you attach the data in a zip file. Include both the displacement and the acceleration if you have both.

The concrete in your model is a nonlinear material, but you should create a linear elastic material with the same stiffness and density just so you can run a Modal analysis. If the first modal frequency of the structure is 33 Hz, but the earthquake has it's peak energy at 3 Hz and has little energy at 33 Hz, then having the building follow almost exactly the 3 Hz ground motion is what you would expect.

Earthquake data is recorded by accelerometers. Do you have the original acceleration vs time data?

You should compute the Shock Response Spectrum for your earthquake data and see what frequency has the largest response. I can do that if you attach the data in a zip file. Include both the displacement and the acceleration if you have both.

The concrete in your model is a nonlinear material, but you should create a linear elastic material with the same stiffness and density just so you can run a Modal analysis. If the first modal frequency of the structure is 33 Hz, but the earthquake has it's peak energy at 3 Hz and has little energy at 33 Hz, then having the building follow almost exactly the 3 Hz ground motion is what you would expect.