A simplified normalized cumulative hysteretic energy spectrum

作者：Sun, Guohua^*; Gu, Qiang; Fang, Youzhen

来源：Earthquakes and Structures, 2017, 12(2): 177-189.

DOI：10.12989/eas.2017.12.1.177

• nonlinear SDOF system
• hysteretic energy
• response spectrum
• damping ratio
• ductility

For energy-based seismic design, a simplified normalized cumulative hysteretic energy spectrum proposed for obtaining hysteretic energy as energy demand is the main objective in this paper. The dimensionless parameter, beta(Eh), is presented to express hysteretic energy indirectly. The beta(Eh) spectrum is constructed directly through subtracting the hysteretic energy of single degree-of-freedom (SDOF) system energy equation. The simplified beta(Eh) spectral formulation as well as pseudo-acceleration spectrum of modern seismic provisions is developed based on the regression analysis of the large number of seismic responses of SDOF system subjected to earthquake excitations, which considers the influence of earthquake event, soil type, damping ratio, and ductility factor. The relationship between PGV and PGA is established according to the statistical analysis relied on a total of 422 ground motion records. The combination of beta(Eh) spectrum and PGV/PGA equation allows determining the cumulative hysteretic energy as a main aseismic design indicator.

• 出版日期2017-2
• 单位苏州科技大学