中文摘要：

采用弹塑性纤维梁柱单元建立具有不同基本周期的钢筋混凝土桥墩（即短周期、中等周期和长周期的单自由度体系）结构计算模型.采用实际地震波和匹配同一反应谱的人工波,通过IDA分析,对比强震地面运动的频谱特性与桥墩结构非线性地震反应的相关性表明：随着地面运动强度的增加以及桥墩结构非线性程度的提高,频谱特性特别是反应谱的谱形对于不同动力特性的桥墩结构非线性地震反应的影响日益显著.在动力分析中,应该根据谱形选择输入地面运动,而不是完全根据震级M、距离R等来选择.

英文摘要：

Finite element models of four RC bridge columns,namely Single-Degree-of-Freedom systems with short-period,middle-period and long-period respectively,were developed using elastic-plastic fiber beam-column elements.Incremental dynamic analysis of four RC bridge columns was conducted using real accelerograms and spectral matched artificial accelerograms for highlighting effects of frequency content of earthquake ground motions on nonlinear seismic responses.The correlation of frequency content with nonlinear seismic responses reveals that frequency content,especially response spectral shape,can significantly influence nonlinear seismic responses with the increase of ground motion intensity and structural nonlinearity.Input ground motions for dynamic analysis should be selected based on response spectral shape more than magnitude and distance.