单自由度体系非线性地震能量反应的计算
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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。建立了单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及地震总输入能在滞回耗能和阻尼耗能之间分配受各因素影响的变化规律。
Along with further study of structure seismic theory, consistent opinion of structure failure due to earthquake is that the dual failure criteria can better agree with seismic damage and tests. The dual failure criteria are based on the first time of exceeding maximum displacement and plastic 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 single degree of freedom 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 effects on the total input seismic energy and its distribution between damping energy and hysteretic dissipated energy.
Along with further study of structure seismic theory, consistent opinion of structure failure due to earthquake is that the dual failure criteria can better agree with seismic damage and tests. The dual failure criteria are based on the first time of exceeding maximum displacement and plastic 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 single degree of freedom 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 effects on the total input seismic energy and its distribution between damping energy and hysteretic dissipated energy.
引文
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[2]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．
[3]白绍良,黄宗明．肖明葵．结构抗震设计的能量分析方法研究述 评[J]．建筑结构,1997,27(4):54-58．
[4] Zahrah T F, Hall W J. Earthquake energy absorption in SDOF structure[J]. Journal of Structural Engineering, 1984,110(8): 1 757-1 772.
[5] Uang C M, Rertero V V. Evaluation of seismic energy in structures [J].Earthquake Engineering and Structure Dynamics, 1990,19(1):77-90.
[2]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．
[3]白绍良,黄宗明．肖明葵．结构抗震设计的能量分析方法研究述 评[J]．建筑结构,1997,27(4):54-58．
[4] Zahrah T F, Hall W J. Earthquake energy absorption in SDOF structure[J]. Journal of Structural Engineering, 1984,110(8): 1 757-1 772.
[5] Uang C M, Rertero V V. Evaluation of seismic energy in structures [J].Earthquake Engineering and Structure Dynamics, 1990,19(1):77-90.
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