【摘要】 着重介绍了几次地震中出现的近场地震动的速度脉冲特性,并利用简化冲击模型来分析速度脉冲效应对地震动加速度、速度、位移的影响.另外,还用近场地震记录对简化冲击的回归公式进行了验证.结果表明:在速度脉冲效应下,地震动峰值位移增大值大于峰值速度增大值,而峰值加速度所受影响最小.在阻尼不是很大的情况下,速度脉冲效应是较大的.因此,考虑近场地震的抗震设计中速度脉冲效应是必要的.更多还原

【Abstract】 In this paper, the effect of velocity pulse in near field ground motions is emphasized and the influence of velocity pulse to acceleration velocity and displacement in earthquake ground motions is analyzed by using simple impact modal. In addition, the regression equations are verified with the records of ground motions. The outcomes indicate that under the effect of velocity pulse the increment of PGD(peak ground displacement)is greater than that of PGV(peak ground velocity), which has less influence on PGA(peak ground acceleration). The effect of velocity pulse is significant in low damp the case. So it’s necessary to consider the effect of velocity pulse in near field ground motions in seismic design. 更多还原