Abstract
This paper explores the energy-based seismic design based on source-to-site distance and the site classification found in Chinese national codes. Specifically, 750 ground motion records were selected according to Chinese site classification, and the equivalent velocity spectra of cumulative hysteretic energy (HE) demand were derived using the energy-balance equation with the single degree of freedom (SDOF) system. In addition, the effects of soil type, earthquake magnitude, site group, structural damping ratio, and ductility ratio were investigated on the HE spectra, and mathematical expression of the equivalent velocity spectrum was presented. The analysis of the HE spectra indicated that the HE spectra were significantly affected by the ground acceleration amplitude, soil type, site group, and damping ratio. The ductility ratio also had an impact on the spectral value, but no effect on the spectral shape. The effect of postyielding stiffness ratio (PYSR) on the spectral shape and spectral value could be neglected. The research findings shed new light on the seismic design based on HE spectrum.
Highlights
The conventional force-based seismic design method can only take into account the effect of maximum response while cumulative damage resulting from numerous inelastic cycles cannot be precisely accounted for (Fajfar and Vidic [1])
This paper explores the energy-based seismic design based on source-to-site distance and the site classification found in Chinese national codes
EKr + ED + EE + EH = EIr where Ekr is the kinetic energy; ED is the energy dissipated from the viscous damping; EE is the elastic strain energy stored in the single degree of freedom (SDOF) system; EH is the hysteretic energy (HE) dissipated from inelastic behaviors; EIr is the total input energy caused by the earthquake
Summary
The conventional force-based seismic design method can only take into account the effect of maximum response while cumulative damage resulting from numerous inelastic cycles cannot be precisely accounted for (Fajfar and Vidic [1]). Resulting from the study of a large set of strong motion records, Decanini and Mollaioli [17] obtained inelastic design input energy spectra for the evaluation of energy seismic demand as a function of soil type, ductility, source-to-site distance, and magnitude. Dogru et al [23] evaluated the energy parameters in terms of total energy input and hysteretic energy for special steel concentrically braced frames (CBFs) with different height, assessed the variation of HE along the frame height by nonlinear dynamic time history analysis, and eventually derived the seismic energy demand spectrum and HE distributions of the CBFs. the existing HE spectra are not applicable in China, because all of them are based on non-Chinese site classifications. The authors investigated the effects of soil type, earthquake magnitude, site group, structural damping ratio, and ductility ratio on the HE spectra and presented the mathematical expression of equivalent velocity spectrum
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
