抗震结构地震能量反应及其影响因素分析
首发时间:2008-09-17
摘要:随着结构抗震理论的深入研究,目前对结构地震破坏比较一致的看法:基于最大位移反应首次超越和塑性累积损伤的双重破坏准则比较符合震害和试验实际。采用能量耗散来描述结构的塑性累积损伤,其形式简单、计算方便,又能够较好地反映地震动的强度、频谱特性,特别是强震持续时间对结构破坏的综合影响。建立了多自由度体系在地震作用下的能量反应公式,通过对结构地震反应能量的计算,综合考虑地震动三要素和结构自身动力特性,分析了地震总输入能受各种因素影响的变化规律。
关键词: 抗震结构 多自由度体系 地震能量反应 地震总输入能
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Earthquake response of seismic structure and its impact on the energy factor
Abstract:Along with further study of structure seismic theory,consistent opinion of strueture failure due to earthquake is that the dual failure crieria can better agree with seismic damage and tests.The dua lfailure criteria are based on the first time of exeeeding maximum displacement and pIastic accumulation damage. Research follows suggest adopting energy dissipation to represent structural plastic accumulation damage,and think that structural energy responses not only have simple form,but also better reflect the effects of earthquake intensity,characteristics of frequency spectrum and especial lasting time of intensive earthquakes on structural failure.Based on the seismic energy formula of multiple degree of freedorn system,total input seismic energy,hysteretic dissipated energy and damping energy can be obtained.It is shown that seismic input motion parameters and structural dynamic parameters have great effeets on the total input seismic energy.
Keywords: Seismic structure MDOF system seismic energy response tota linput seismic energy
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No.2410331598012216****
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