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首页> 外文期刊>Bulletin of earthquake engineering >New procedure for deriving multifrequential dynamic equivalent signals (LEMA_DES): a test-study based on Italian accelerometric records
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New procedure for deriving multifrequential dynamic equivalent signals (LEMA_DES): a test-study based on Italian accelerometric records

机译：推导多频动态等效信号（LEMA_DES）的新过程：基于意大利加速度计记录的测试研究

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摘要

The here proposed LEMA_DES (Levelled-Energy Multifrequential Analysis for Dynamic Equivalent Signals) procedure is a new approach for defining multifrequential dynamic equivalent signals from real accelerograms, to be applied for physic-analogue and numerical geotechnical modelling of induced seismic effects. In this approach, the resulting equivalent signals satisfy criteria of spectral, energetic and kinematic equivalence to the related real prototypes. The approach was tested to analyse the accelerometric records of the November 23rd, 1980 Irpinia (Italy) earthquake. Based on 48 selected records, correlations were studied between the characteristic parameters of both real and equivalent signals. These correlations demonstrate that the proposed approach guarantees: i) the energy equivalence of the derived signals, except for a half order of magnitude, and ii) the equivalence of the peak ground acceleration (PGA) values with relative errors below 105%. The computed relative error on the cumulative energy of the LEMA_DES signals (Delta r V (eq) %), which have spectral amplitudes at frequencies lower than 1 Hz, drops below 30%, while the same error increases above 2500%, in the same frequency range, for sinusoidal signals obtained according to traditional approaches. The PGAs of the LEMA_DES signals show a good fit with the PGA attenuation law proposed for the central-southern Apennines. Correlations between the Arias intensities and PGAs of the equivalent signals with respect to the actual ones demonstrate that their characteristic parameters: i) well represent the spatial variation in terms of energy and ground motion; ii) reproduce an analogue earthquake scenario with respect to the reference seismic event.
机译：此处提出的LEMA_DES（动态等效信号的水平能量多频率分析）程序是一种从实际加速度图定义多频动态等效信号的新方法，将其应用于诱发地震效应的物理模拟和数值岩土建模。在这种方法中，所产生的等效信号满足相关实际原型在频谱，能量和运动学上的等效标准。测试了该方法以分析1980年11月23日伊尔皮尼亚（意大利）地震的加速度记录。根据48条选定的记录，研究了真实信号和等效信号的特征参数之间的相关性。这些相关性表明，所提出的方法可以保证：i）除半个数量级外，其他信号的能量等效性; ii）相对误差低于105％的峰值地面加速度（PGA）值的等效性。计算出的LEMA_DES信号的累积能量的相对误差（Delta r V（eq）％）在相同的频率下具有低于1 Hz的频谱幅度，下降到30％以下，而同一误差在2500％以上增加频率范围，用于根据传统方法获得的正弦信号。 LEMA_DES信号的PGA与拟议用于中南部亚平宁山脉的PGA衰减定律非常吻合。等效信号的Arias强度和PGA与实际信号之间的相关性表明，它们的特征参数：i）很好地代表了能量和地面运动的空间变化; ii）再现关于参考地震事件的模拟地震场景。

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