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2015年4月25日尼泊尔廓尔喀地区发生MS8.1级地震,本文分析了加德满都强震台站的强地震动记录特征,其水平向地震动表现为明显的脉冲地震动,脉冲周期约为6.0s,反映了近场地震动的方向性效应;处于深厚沉积层上的加德满都谷地对地震动有一定的放大作用,且主震的场地峰值频率向低频段偏移,出现明显的场地非线性反应;采用随机有限断层方法模拟的空间地震动分布与宏观地震烈度图符合较好,可以为分析宏观震害提供参考;通过与尼泊尔设计反应谱对比,得出在短周期与长周期段,加德满都台站的水平向地震动的反应谱远高于设计反应谱,说明即使严格按照尼泊尔建筑抗震规范设计施工的建筑结构也难以抵御此次地震的破坏。
On April 25, 2015, an MS8.1 earthquake occurred in the Gorkha region of Nepal. This paper analyzes the strong earthquakes recorded at the Kathmandu stronghold stations. The horizontal earthquakes show obvious pulse ground motions with a pulse period of about 6.0s, which reflects the directivity effect of near-field vibration. The Kathmandu Valley in the deep sedimentary layer has a certain amplification effect on earthquakes, and the peak frequency of the main shock field is shifted to the low frequency band, showing obvious nonlinear response ; The simulation of the spatial ground motion using the stochastic finite fault method is in good agreement with the macro-seismic intensity map and can provide a reference for the analysis of macro-earthquake damage. By comparing with the design response spectrum of Nepal, it is concluded that in the short period and the long period, Kathmandu The response spectrum of the horizontal ground motion to the station is much higher than that of the designed response spectrum, which shows that it is hard to resist the earthquake damage even if the building structure designed and constructed in strict accordance with the Nepalese seismic code.