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以简化成单自由度(SDOF)体系结构在地震作用下的输入能量为基础,研究地震输入能量和结构最大变形之间的关系。对于刚度退化SDOF体系,引入表征能量和变形间关系的等效速度比参数,以3种场地下的214条近断层地震记录为输入,采用非线性时程计算和统计分析方法,提取累积输入能量、瞬时输入能量和非弹性变形间关系的分布特征,提出了不同场地下等效速度比的分段线性化函数,并用多自由度(MDOF)桥墩算例的时程计算结果进行了对比分析。结果表明:所建议的简化计算方法是有效的,可用于基于能量的桥梁结构抗震设计与评估。
The relationship between seismic input energy and the maximum deformation of structure is studied based on the simplified input energy of a single degree of freedom (SDOF) architecture under earthquake action. For the SDOF system with stiffness degradation, the equivalent velocity ratio parameters that characterize the relationship between energy and deformation were introduced. The 214 near-fault seismograms recorded at 3 sites were used as input. The nonlinear time history and statistical analysis were used to extract the cumulative input energy , Instantaneous input energy and inelastic deformation, the piecewise linearization function of equivalent velocity ratio under different fields is proposed and compared with the time-history calculation results of multi-freedom (MDOF) piers. The results show that the proposed simplified calculation method is effective and can be used for seismic design and evaluation of energy-based bridge structures.