地震动特性对单自由度系统地震能量响应的影响-《郑州大学学报(工学版)》

文章信息/Info

作者:: 李宇; 白桦; 王涛.; 长安大学公路学院旧桥检测与加固技术交通行业重点试验室,陕西西安,710064, 长安大学公路学院旧桥检测与加固技术交通行业重点试验室,陕西西安,710064, 长安大学公路学院旧桥检测与加固技术交通行业重点试验室,陕西西安,710064

Author(s):: LI Yu; BAI Hua; WANG Tao; Key Laboratory of Ministry of Communications for Bridge Detection &Reinforcement Technology ， Chang’an University，Xi’ an710064，China

Keywords:: SDOF system; seismic energy response; characteristics of earthquake motion; hysteretic energydissipation ; damping energy dissipation

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.

Abstract:: 320 strong motion records of four sites are appropriately selected.Based on energy equations of SD-OF system, the elasto-plastic dynamic analysis program is used to study the effects of characteristics of earth-quake motion on seismic energy response of SDOF system.The study results are obtained as follows;Seismicenergy response,hysteretic energy dissipation and damping energy dissipation increased with the increase ofearthquake magnitude.The medium length period structures subjected to minor shock are depended on damp-ing energy dissipation to consume the seismic energy.And,structures subjected to major shoek are dependanton hysteretic energy dissipation to consume the seismic energy.When the site soil softens,seismic energy re-sponse increases and its amplification also aggravates.Seismic energy spectra of other protected earthquake in-tensity can be obtained by adjusting seismic energy spectra of the standard protected earthquake intensity ac-cording to square ratio of PCA ( protected earthquake intensity ) to PCA ( standard protected earthquake).