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选取91组速度脉冲时程,每组均包括原始时程和去掉速度脉冲后的时程。按震中距把91组时程分成11类,统计结果表明:速度脉冲主要分布在震中距50km以内,约占80%,再考虑到每一类时程的数量不悬殊,将11类时程按震中距归并为7类。以实际高层钢筋混凝土框架结构工程为例,将这7类时程作为地震动输入分别进行隔震计算。结果表明:采用含速度脉冲时程进行隔震计算时,层间剪力和减震系数分别是采用不含速度脉冲时程计算结果的1.45~1.82倍和1.40倍,两者基本呈先增大后减小趋势;提出了速度脉冲型地震动工程特性研究,含速度脉冲时程与不含速度脉冲时程应具有同源性准则。
91 speed pulse durations are selected. Each group includes the original time history and the time duration after removing the speed pulse. According to the epicenter distance, 91 groups of time-periods are divided into 11 categories. The statistical results show that the velocity pulses are mainly distributed within 50km of the epicenter, accounting for about 80% of the epicentral distances. Taking into account that the number of each type of time-series is not disparity, Epicentral distance merged into seven categories. Taking the actual high-rise reinforced concrete frame structure project as an example, the seven types of time-history are calculated respectively as seismic input. The results show that the inter-story shear and damping coefficients are 1.45-1.82 and 1.40 times that of the one without velocity pulse, respectively Afterwards, the research on the engineering characteristics of velocity-pulse-type ground motion is proposed. The criterion of homology with and without velocity pulse should be given.