结构地震总输入能量影响因素分析
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摘要
地震总输入能量是结构抗震能量分析与评估的重要内容之一,利用能量谱对单自由度体系地震总输入能量的影响因素进行了分析,影响因素包括地震动特性(强度、频谱、持时)以及结构特性(延性系数、阻尼比),分析中还考虑了不同场地土类型的影响。研究得到了一些有意义的结论,包括:滞回耗能与总输入能量之比受地震强度的影响很小;结构最大强度与能量需求不同步;结构延性和阻尼的增加可以有效削弱能量谱峰值,而在短周期和长周期范围影响较小,等等。研究成果可为结构地震输入能量以及滞回耗能评估提供参考和依据。
Seismic input energy is an important part of seismic energy analysis and evaluation of structures.The influence factors of seismic input energy for single degree of freedom systems were studied by utilizing energy spectrum.These influence factors included ground motion properties(intensity,spectrum,duration) and structure properties(ductility coefficient,damping ratio).The effect of different ground types was also taken into account.Some significant conclusions were as follows:the ground motion intensity had little effect on the ratio of hysteretic energy to input energy.The requirment for the maximum strength and the maximum energy were asynchronous for structures.The ductility and damping of structures played an effective role in reducing the peak values of energy spectrum,but had little effect on it in the range of short periods or long periods,etc.Research results can provide an important reference for evaluation of seismic input energy and hysteretic energy.
Seismic input energy is an important part of seismic energy analysis and evaluation of structures.The influence factors of seismic input energy for single degree of freedom systems were studied by utilizing energy spectrum.These influence factors included ground motion properties(intensity,spectrum,duration) and structure properties(ductility coefficient,damping ratio).The effect of different ground types was also taken into account.Some significant conclusions were as follows:the ground motion intensity had little effect on the ratio of hysteretic energy to input energy.The requirment for the maximum strength and the maximum energy were asynchronous for structures.The ductility and damping of structures played an effective role in reducing the peak values of energy spectrum,but had little effect on it in the range of short periods or long periods,etc.Research results can provide an important reference for evaluation of seismic input energy and hysteretic energy.
引文
[1]肖明葵,刘波,白绍良.抗震结构总输入能量及其影响因素分析[J].重庆建筑大学学报,1996,18(2):20-33.
[2]肖明葵,刘纲.结构的滞回耗能特性及其影响因素分析[J].工程力学,2000(S1):242-247.
[3]Akiyama H.Earthquake resistant limit-state design forbuildings[M].Tokyo:University of Tokyo Press,1985.
[4]Shen J,Akbas B.Seismic energy demand in steelmoment frames[J].Journal of EarthquakeEngineering,1999,3(4):519-559.
[5]程光煜,叶列平.弹塑性SDOF系统累积滞回耗能谱[J].工程抗震与加固改造,2007,29(2):1-7.
[6]Manfredi G.Evaluation of seismic energy demand[J].Earthquake Engineering Structural Dynamics,2001,30(4):485-499.
[7]Khashaee P.Energy-based seismic design and damageassessment for structures[D].Dallas:SouthernMethodist University,2004.
[2]肖明葵,刘纲.结构的滞回耗能特性及其影响因素分析[J].工程力学,2000(S1):242-247.
[3]Akiyama H.Earthquake resistant limit-state design forbuildings[M].Tokyo:University of Tokyo Press,1985.
[4]Shen J,Akbas B.Seismic energy demand in steelmoment frames[J].Journal of EarthquakeEngineering,1999,3(4):519-559.
[5]程光煜,叶列平.弹塑性SDOF系统累积滞回耗能谱[J].工程抗震与加固改造,2007,29(2):1-7.
[6]Manfredi G.Evaluation of seismic energy demand[J].Earthquake Engineering Structural Dynamics,2001,30(4):485-499.
[7]Khashaee P.Energy-based seismic design and damageassessment for structures[D].Dallas:SouthernMethodist University,2004.
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