曲哲, 师骁. 汶川地震和鲁甸地震的脉冲型地震动比较研究[J]. 工程力学, 2016, 33(8): 150-157. DOI: 10.6052/j.issn.1000-4750.2015.01.0039
引用本文: 曲哲, 师骁. 汶川地震和鲁甸地震的脉冲型地震动比较研究[J]. 工程力学, 2016, 33(8): 150-157. DOI: 10.6052/j.issn.1000-4750.2015.01.0039
QU Zhe, SHI Xiao. COMPARATIVE STUDY ON THE PULSE-LIKE GROUND MOTIONS IN THE WENCHUAN AND THE LUDIAN EARTHQUAKES[J]. Engineering Mechanics, 2016, 33(8): 150-157. DOI: 10.6052/j.issn.1000-4750.2015.01.0039
Citation: QU Zhe, SHI Xiao. COMPARATIVE STUDY ON THE PULSE-LIKE GROUND MOTIONS IN THE WENCHUAN AND THE LUDIAN EARTHQUAKES[J]. Engineering Mechanics, 2016, 33(8): 150-157. DOI: 10.6052/j.issn.1000-4750.2015.01.0039

汶川地震和鲁甸地震的脉冲型地震动比较研究

COMPARATIVE STUDY ON THE PULSE-LIKE GROUND MOTIONS IN THE WENCHUAN AND THE LUDIAN EARTHQUAKES

  • 摘要: 近年来我国在近断层地震动观测及其对建筑结构地震反应的影响方面开展了有意义的工作,但我国大陆地区获取的近断层脉冲型地震动数量仍非常有限。2014年发生在云南省鲁甸县的Mw6.3级地震造成了与其震级不相称的严重伤亡和建筑震害,除建筑抗震能力和次生灾害等因素之外,破坏力强大的近断层脉冲型地震动也是重要的致灾因素。该文采用基于小波变换的脉冲识别方法,分析了在鲁甸地震中获取的地震动记录的脉冲特性,并与2008年汶川地震中的近断层脉冲型地震动进行了比较。结果显示,与汶川地震中的脉冲型地震动相比,鲁甸龙头记录速度脉冲周期较短,但其速度峰值很大,在6级左右的中等地震中非常少见。此外,该记录的能量分布具有明显的方向性。但由于该台站震中距很小,其成因能否用向前方向性效应解释仍有待商榷。

     

    Abstract: Although many efforts have been taken in the past years to study the near-fault ground motion observation and its effects on the seismic responses of building structures, the number of near-fault pulse-like ground motion records in mainland China is still very limited. The Mw6.3 Ludian earthquake in 2014 caused high fatality and severe building damages disproportional to its earthquake magnitude. Despite the insufficient seismic performance of the local buildings and the influence of secondary disasters, the significant near-fault pulse-like ground motion was another important factor. The velocity pulses in the Ludian Earthquake motion records are identified by a quantitative method incorporating wavelet transformation. The characteristics of these pulses are compared with those obtained in the 2008 Wenchuan Earthquake. The comparison shows the velocity pulse in the LLT record has much shorter period but higher peak velocity, which is rare for moderate earthquakes of magnitude about 6. Furthermore, directivity of the pulse energy distribution of the LLT record is observed. Further investigations are needed before attributing the significant velocity pulse to the forward directivity because the LLT station is too close to the epicenter.

     

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