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首页> 外文期刊>Arabian Journal for Science and Engineering >The Improvement of Structural Adequacy AgainstLarge Demands of Near-Fault Ground Motions
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The Improvement of Structural Adequacy AgainstLarge Demands of Near-Fault Ground Motions

机译：应对近断层地面运动的大量需求的结构适当性的提高

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摘要

Near-fault ground motions impose large demands on structures compared to ordinary ground motions. Recordings suggest that near-fault ground motions with 'forward' directivity are characterized by a large pulse, which is mostly orientated perpendicular to the fault. The maximum velocity direction (MVD) component is calculated by finding the angle that the maximum velocity resultant of the original longitudinal and transverse components will be occurred. The MVD component has larger PGV and PGD values compared to other components of near-fault ground motions. The spectral values of the MVD component are an envelope of the other decomposed components. The improvement of structural adequacy against large demands of near-fault ground motions has been the subject of research for the last decade. This study intends to provide quantitative knowledge on the near-fault ground motion demand and corresponding structural capacity requirements. The spectral quantities were computed through an attenuation relationship that is based on the near-fault ground motion records. New findings in this study are compared with the Uniform Building Code provisions and other attenuation relationships. The results demonstrate that for large magnitude events (M_w > 7), the UBC97 near-source factors (N_a, N_v) have more conservative values compared to the study estimates. Hence, seismic coefficients of UBC97 have serious concern for estimating strength when short distances and large magnitude events are considered.
机译：与普通的地震动相比，近断层地震动对结构提出了更高的要求。记录表明，具有“正向”方向性的近断层地震动的特征是大脉冲，该脉冲大部分垂直于断层。通过找到将出现原始纵向和横向分量的最大速度结果的角度来计算最大速度方向（MVD）分量。与近断层地面运动的其他分量相比，MVD分量具有更大的PGV和PGD值。 MVD分量的光谱值是其他分解分量的包络。在过去的十年中，针对近断层地面运动的大量需求而提高结构上的适应性一直是研究的主题。本研究旨在提供有关近断层地震动需求和相应结构能力需求的定量知识。通过基于近断层地面运动记录的衰减关系来计算频谱量。将这项研究中的新发现与《统一建筑规范》规定和其他衰减关系进行比较。结果表明，与研究估计相比，对于大事件（M_w> 7），UBC97近源因子（N_a，N_v）具有更保守的值。因此，当考虑到短距离和大震级事件时，UBC97的地震系数对于估算强度非常重要。

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