【摘要】 合理地选取了4类场地320条强震记录,基于SDOF体系的地震能量方程,利用弹塑性动力分析程序,研究了地震动特性对SDOF体系的地震能量响应及其分配规律的影响,结果表明,SDOF体系的地震总输入能、滞回耗能、阻尼耗能都随着震级的增大而增大,阻尼耗能是中长周期结构在小震作用下消耗地震能量的主要方式,而滞回耗能则是结构在大震作用下消耗地震能量的主要方式;随着场地土质的变软,各类地震能量响应都呈递增趋势,它们的增幅也随着场地土质的变软而加剧;只要以某一设防烈度为标准,并给出相应的能量反应谱,则其它设防烈度的能量反应谱就可以根据PGA设防烈度与PGA标准烈度比值的平方调整得到.更多还原

【Abstract】 320 strong motion records of four sites are appropriately selected.Based on energy equations of SDOF system,the elasto-plastic dynamic analysis program is used to study the effects of characteristics of earthquake motion on seismic energy response of SDOF system.The study results are obtained as follows: Seismic energy response,hysteretic energy dissipation and damping energy dissipation increased with the increase of earthquake magnitude.The medium length period structures subjected to minor shock are depended on damping energy dissipation to consume the seismic energy.And,structures subjected to major shock are dependant on hysteretic energy dissipation to consume the seismic energy.When the site soil softens,seismic energy response increases and its amplification also aggravates.Seismic energy spectra of other protected earthquake intensity can be obtained by adjusting seismic energy spectra of the standard protected earthquake intensity according to square ratio of PGA(protected earthquake intensity) to PGA(standard protected earthquake).更多还原