Near-fault (NF) ground motions may induce higher demands on structures compared to far-fault records. This is often due to the velocity pulses, called forward-directivity pulses, which are commonly observed in the fault-normal ground motion components. Hence, some researchers accept such pulses as the representative of pulse-like motions. This paper is devoted to studying the nature of NF events by evaluating their impact on the structural response. To this end, a group of ten-story steel moment-resisting frames with regular and setback configuration were subjected to NF pulse-like records. The records were decomposed to distinct frequency components, including the extracted pulses (low-frequency components) and the residual (high-frequency) parts. The effect of T_P/T₁ (the ratio of pulse period to the first-mode structural period) was also evaluated by classifying the earthquake records into four groups, indicating T_P/T₁≈0.5, 1, 2, and > 2. Furthermore, soil-structure interaction (SSI) was considered through the Beam on the Nonlinear Winkler Foundation theory. Incremental dynamic analyses were conducted under the action of the original ground motions, extracted pulses and residual parts. The results deeply question the possibility of using directivity pulses as the representative of original excitation in dynamic time history analyses, especially for setback structures. The residual component plays an important role in seismic response of such structures in most cases of T_P/T₁. The considerable effect of this frequency component is also observed in regular structures when T_P/T₁≈1. Meanwhile, SSI can increase structural drift demands, especially in setback structures, when subjected to NF pulse-like records.

与远断层记录相比，近断层（NF）地震动可能会引起对结构的更高要求。这通常是由于速度脉冲（称为正向脉冲）引起的，通常在断层法向地面运动分量中会观察到这种速度脉冲。因此，一些研究人员接受这样的脉冲作为脉冲状运动的代表。本文致力于通过评估NF事件对结构响应的影响来研究其本质。为此，对一组具有规则和后退构型的十层钢制抗力矩框架进行了类似NF脉冲的记录。记录被分解为不同的频率成分，包括提取的脉冲（低频成分）和残留（高频）成分。的效果Ť _P / T ₁还通过将地震记录分为四组来评估（脉冲周期与第一模式结构周期之比），表明T _P / T ₁ ≈0.5、1、2和> 2。通过非线性Winkler基础理论上的Beam来考虑SSI）。在原始地面运动，提取的脉冲和剩余部分的作用下进行了增量动力分析。结果深深地质疑了使用方向性脉冲作为动态时程分析中原始激励的代表的可能性，特别是对于后退结构。在大多数T _P / T ₁情况下，残余成分在此类结构的地震响应中起着重要作用。。此频率分量的相当大的效果也以规则的结构时所观察到Ť _P / T ₁ ≈1。同时，当遭受NF脉冲状记录时，SSI会增加结构漂移的需求，尤其是在挫折结构中。