由于强烈运动对罗马台伯河冲积层的震动影响的数值模拟
Numerical modelling of shaking effects due to strong motions on the tiber alluvial deposits in Rome (Italy)
摘要：
一个多学科的方法，提出了由于强烈的运动对台伯河冲积层在罗马的历史中心的影响进行评估。在这个目标中，详细的台伯河冲积矿床的三维地质模型已经建成，并进行了数值分析的网站响应沿两个地质段横跨罗马的历史中心。通过应用三分量地震输入，假设线性和非线性条件，在1D和2D配置中执行数值模型。结果表明，最大剪应变强烈地受到层的几何形状（即二维或一维条件）和土壤的非均匀性。此外，通过数值模拟得到的最大应变的可靠性进行了讨论，比较这些值相对于所考虑的土壤的体积和降解动态阈值。
英文摘要：
A multidisciplinary approach is proposed for evaluating the effects of shaking due to strong motions on the Tiber river alluvial deposits in Rome's historical centre. At this aim, a detailed 3D geological model of the Tiber river alluvial deposit has been constructed and a numerical analysis of site response was performed along two geological sections across the historical centre of Rome. The numerical models were performed in both 1D and 2D configurations assuming linear and nonlinear conditions, by applying a three component seismic input. The results show that the maximum shear strains are strongly conditioned by the layer geometries (i.e. 2D or 1D conditions) and by the soil heterogeneity. Moreover, the reliability of the maximum strains obtained by numerical modeling is discussed comparing these values respect to both the volumetric and the degradation dynamic thresholds of the considered soils.
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