地震动特性对单自由度系统地震能量响应的影响
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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.
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).
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).
引文
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[2]AKIYAMA H.Earthquake Resistant Design Based onthe Energy Concept[C]//Proceedings of 9th WCEE,Japan:Tokyo,1988:905-910.
[3]MICHEL B.Some aspects of energy methods for theinelastic seismic response of ductile SDOF structures[J].Engineering Structures,1996,18(1):1-12.
[4]LUIS D D.An energy-based methodology for the as-sessment of seismic demand[J].Soil Dynamics andEarthquake Engineering,2001,21:113-137.
[5]熊仲明,史庆轩.框架结构基于能量地震反应分析及设计方法的理论研究[J].振动与冲击,2003,22(4):8-12.
[6]江辉.近场地震下桥梁结构基于性能抗震设计的能量方法[D].北京:北京交通大学土建学院,2007.
[7]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[8]史庆轩,杨文星,门进杰.单自由度体系非线性地震能量反应分析[J].建筑科学与工程学报,2005,22(2):25-29.
[9]李菊芳.建筑结构基于能量的地震反应分析及设计方法[D].西安:西安建筑科技大学土木建筑工程学院,2004.
[10]肖明葵.基于性能的抗震结构位移及能量反应分析方法研究[D].重庆:重庆大学土木建筑工程学院,2004.
[11]ANINDYA D.Bridge on energy based seismic analysisand design of highway[D].Faculty of the GraduateSchool of the State University of New York at Buffalo,1999.
[12]中华人民共和国铁道部.GB 50111—2006铁路工程抗震设计规范[S].北京:中国计划出版社,2006.
[13]中华人民共和国交通运输部.JTG/TB 02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
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