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强烈的速度脉冲运动严重影响结构的地震响应,而目前的抗震设计规范并未对结构的速度响应作出全面分析。因此,根据汶川地震记录筛选出两组具有代表性的近断层强震数据:一组3向均含有速度脉冲;另一组3向均不含速度脉冲。对选出的6条地震动的速度反应谱、V~2时-频反应谱、累积动能曲线进行了分析比较。在此基础上,以某钢筋混凝土框架结构为例,探讨了结构在这两组输入地震动作用下的动力响应差异和速度脉冲对钢筋混凝土结构的地震反应影响。结果表明:近断层速度脉冲型地震动对各频率段的单自由度体系均有较大的能量输入,且对长周期结构具有更大的破坏作用。
Strong velocity pulse motion seriously affects the seismic response of the structure, but the current seismic design code does not provide a comprehensive analysis of the velocity response of the structure. Therefore, two sets of representative near-fault strong earthquakes are selected according to the records of Wenchuan earthquake: one group contains velocity pulses in all three directions, and the other three groups do not contain velocity pulses. The velocity response spectrum, V ~ 2 time-frequency response spectrum and cumulative kinetic energy curve of the six earthquakes were analyzed and compared. Based on this, taking a reinforced concrete frame structure as an example, the influence of the dynamic response of the structure on the seismic response of the reinforced concrete structures is discussed. The results show that the near-fault-velocity impulsive ground motion has a large energy input to single-degree-of-freedom systems in each frequency band and has a greater damaging effect on long-period structures.