Near-fault ground motions (NFGM) may have a significant component of the long period velocity pulse (LPVP) due to the directivity effect. The structures subjected to such ground motions are prone to experience large displacements. In this paper, the damage potential of such motions is compared with NFGM (without LPVP) and far-field motions in terms of seismic demand (inter-storey drift and inelastic displacement). Due to the lack of site-specific recorded NFGM, the synthetic ground motions are generated and used in this study. For this purpose, first the bedrock motions are obtained through stochastic simulation approach in which the Specific Barrier Model (SBM) is used as source spectrum and then these motions are transferred to the ground surface using one-dimensional ground response analysis. In order to obtain the NFGM with pulse, the bedrock motions are superimposed with the LPVPs and then transferred to the ground surface. To illustrate, the case of a ten-storey reinforced concrete (RC) building is considered in Delhi region (India) which falls under the seismic zone-IV. The main finding of this study is the observation that the NFGM with LPVP impose almost double seismic demand compared to the NFGM without LPVP, specially for the structures lying in the velocity-region of the response spectrum. In this study, the effect of depth of bedrock on seismic demand is highlighted and recommended to be included in the design seismic demand of NFGM.

由于方向性效应，近断层地面运动（NFGM）可能具有长周期速度脉冲（LPVP）的重要组成部分。遭受这种地面运动的结构容易产生大的位移。在本文中，就地震需求（层间漂移和非弹性位移）而言，此类运动的破坏潜力与 NFGM（无 LPVP）和远场运动进行了比较。由于缺乏特定地点记录的 NFGM，本研究中生成并使用了合成地面运动。为此，首先通过随机模拟方法获得基岩运动，其中使用特定障碍模型（SBM）作为源谱，然后使用一维地面响应分析将这些运动转移到地面。为了获得脉冲 NFGM，将基岩运动与 LPVP 叠加，然后传输到地表。为了说明这一点，以印度德里地区的一栋十层钢筋混凝土 (RC) 建筑为例，该地区属于 IV 级地震带。本研究的主要发现是观察到，与不带 LPVP 的 NFGM 相比，带 LPVP 的 NFGM 提出了几乎两倍的地震需求，特别是对于位于响应谱速度区域的结构。本研究强调了基岩深度对抗震需求的影响，并建议将其纳入NFGM的设计抗震需求中。