Projects

Study and Analyze an Earthquake Ground Motion Records:

Giving 5860 recorded points of an earthquake ground motion to analyze and draw five different response curves of pseudo acceleration was a challenging project. The project requires to analyze the given data and draw response spectrums using Central difference method and Excel. Without going deep into complicated details, here are some steps helped to achieve the required results:

Setup an excel file for each given damping ratio, which called here (cieta 1%, 2% ...etc) . (five damping ratio = five Excel files + last file to draw the final result)
Transfer the ground motion records to be the applied loads.
In each file using multiple spreadsheets, where each sheet has different natural time (Tn).
In order to have an accurate result as possible, for a (Tn) values vary between 0 to 50 seconds about 25 different Tn values were used.
Pick the maximum value for each (Tn), to be used to draw the Pseudo acceleration curve due to each specific damping ratio.

Graphic representation for given earthquake ground motion records.

Final result:

This result is based on constant mass value (m) and variable calculated stiffness coefficient (k). As the picture to the right shows, the lower the damping ratio gets, the higher the acceleration values possible to occur. Therefore, this result proves buildings with bigger damping system should have less response to an earthquake ground motion. In other words, the larger the damping system, the more resistance building has to an earthquake ground motion.