【摘要】 针对基于性能的桥梁抗震设计理论,地面运动的变异性,特别是反应谱的离散性对桥梁结构地震需求的影响最为显著。选择3个具有不同基本周期的钢筋混凝土单墩模型和2组实际地震波,通过IDA分析,获得反应谱离散度与桥墩结构地震需求之间的关联性,计算结果表明:地震波反应谱的离散度与桥墩结构地震需求的离散度密切相关;合理选择实际地震波,减小反应谱之间的离散性,可以显著提高桥墩结构地震反应预计的精确性和计算效率。更多还原

【Abstract】 The variability of strong ground motions,especially the dispersion of response spectra,have significant effects on seismic demands for performance-based design of bridge.Incremental dynamic analysis is performed for three bridge columns with different fundamental periods using two bins of real earthquake ground motions.The correlation between the dispersion of response spectra and seismic demands of bridge columns can demonstrate that the probabilistic seismic demand assessment of bridge columns is closely related to the dispersion of response spectra of selected ground motions.It can significantly improve the precision and efficiency of seismic response assessments of bridge columns by means of rational selection of real earthquake ground motions which can reduces the dispersion of response spectra.更多还原