A long-period elastic response spectrum based on the site-classification of Chinese seismic code. Issue 115 (December 2018)

• Record Type: Journal Article
• Authors: Zhou, Jing; Jiang, Yi; Wang, Lixiao; Fang, Xiaodan
• Is Part Of: Soil dynamics and earthquake engineering. Issue 115(2018)
• Page Start: 622
• Page End: 633
• Publication Date: 2018-12
• Subjects: Absolute acceleration spectrum -- Attenuation power index -- Characteristic period of a site -- Dynamic amplification factor -- Long-period ground motion -- Damping reduction factor; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2018.09.024
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: This paper analyzes the difference between an earthquake inertial force-based absolute acceleration spectrum and a structure hysteretic restoring force-based pseudo-acceleration spectrum and discusses the variability of the attenuation of the long-period seismic pseudo-acceleration spectrum and the spectrum of its damping reduction factor (DRF). An elastic spectrum analysis was used to study the characteristic period of the pseudo-acceleration dynamic amplification factor as well as the attenuation index and damping adjustment factors of two declining segments. The results show that the hysteretic restoring force should be used to calibrate the bearing capacity-based seismic design spectrum. Long-period ranges with a high damping ratio have faster pseudo-acceleration spectrum attenuation rates. It is reasonable for a standard design spectrum to use simple T −1 and T −2 attenuation rules for the first and second declining segments. Correction of the attenuation index is not necessary to obtain a pseudo-acceleration-based high damping ratio design spectrum. The amplification factor of the long-period response spectrum is affected by site characteristics, and the long-period component of the ground motion significantly affects the structural DRF. Highlights: Pseudo-acceleration spectra and absolute acceleration spectra have different attenuation behaviors. Correction of the attenuation index is not necessary to obtain a high damping ratio seismic design spectrum. The pseudo-acceleration spectrum-based DRF and the absolute acceleration spectrum based-DRF are significantly different.