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首页> 外文期刊>Bulletin of earthquake engineering >Relevant features of the valley seismic response: The case study of Tuscan Northern Apennine sector
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Relevant features of the valley seismic response: The case study of Tuscan Northern Apennine sector

机译：山谷地震响应的相关特征：以托斯卡纳北部亚平宁地区为例

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摘要

The so called "valley effect" relates to the typical seismic response of basin shaped bedrock filled by quaternary sediments. It is an aspect of the renown "local seismic effect" that shall be taken into account when dealing with microzoning studies. Several experimental surveys and numerical simulations performed worldwide over the last 40 years, confirmed that valley responses under seismic excitations show common features in various geological contexts as far as the sedimentary valleys (e.g. alluvial and lacustrine plains), the intermountain valleys (e.g. alpine valleys) and graben shaped basins. Such features mainly depend on the basin geometry, referred to as the shape ratio SR, and the sediment and basin impedance contrast IC. Although researchers agree on the prominent role of local seismic effects for interpreting erratic damages caused by seismic shaking in urbanized areas, no fully shared strategies have been identified for taking into account valley effect within microzoning studies. In this paper, a numerical simulations on three models of trapezoidal shaped basins have been performed. These valley models relate to sediments and basins detected within the Tuscany Region territory during the VEL project. Results, in terms of the amplification index FA have been provided. Three "valley effect charts" for various SR and IC values have been propose for taking into account the local seismic effects due to the basin amplifications within microzoning maps.
机译：所谓的“谷效应”涉及由第四纪沉积物填充的盆状基岩的典型地震响应。这是著名的“局部地震效应”的一个方面，在进行微区划研究时应予以考虑。在过去的40年中，全球范围内进行的几次实验调查和数值模拟证实，地震激发下的山谷响应在各种地质背景下都显示出共同的特征，包括沉积山谷（例如冲积平原和湖相平原），山间山谷（例如高山山谷）并抓住形盆。这些特征主要取决于盆地的几何形状（称为形状比SR）以及沉积物和盆地阻抗对比IC。尽管研究人员一致认为局部地震效应在解释城市化地区的地震震动造成的不稳定破坏方面具有显著作用，但在微区划研究中，尚未考虑到完全相同的策略来考虑山谷效应。本文对梯形盆地的三种模型进行了数值模拟。这些山谷模型与在VEL项目期间在托斯卡纳地区境内发现的沉积物和盆地有关。提供了关于扩增指数FA的结果。已经提出了针对各种SR和IC值的三个“谷效应图”，以考虑到由于微区划图中的盆地放大而引起的局部地震效应。

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