The damping ratio holds significant importance within dynamic analyses and plays a pivotal role in the seismic design of structures. Elastic response spectra are widely employed in such design processes to depict the effects of earthquakes on specific site classes. Typically, the response spectrum is defined assuming a damping ratio of 5%, which is considered appropriate for the majority of conventional buildings. Nevertheless, it is worth noting that damping ratios other than 5% may be applicable to different types of structures, exhibiting both lower and higher damping ratios. It is generally recommended to utilize a damping ratio of approximately 5% for concrete structures. Conversely, steel structures are typically estimated to exhibit a damping ratio of around 2%. These values reflect these two distinct structural materials' respective damping characteristics and behavior. Tall and slender buildings often feature substantially lower damping ratios, while low-rise structures may necessitate significantly larger damping ratios surpassing the 5% threshold. For these specialized building types, adjustments should be made to the elastic response spectra to accommodate varying levels of damping ratios. This study introduces damping modification factors (DMFs), which are computed based on 5% damped response spectra as the reference standard. Strong ground motion data from Kahramanmaraş (Pazarcık) earthquake is selected and pseudo-acceleration response spectra are computed for 3%, 5%, 7%, 10%, 15%, 20%, and 30% damping ratios. DMFs are computed using these spectra and graphical representations are utilized to illustrate the fluctuations of DMFs across various damping ratios. ORCID NO: 0000-0001-6435-8122
Anahtar Kelimeler: Damping ratio, Damping modification factor, Kahramanmaraş earthquake, Pseudo-acceleration response spectra, Seismic design
|
