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首页> 外文期刊>Bulletin of Earthquake Engineering >Design spectra and amplification factors for Eurocode 8
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Design spectra and amplification factors for Eurocode 8

机译：Eurocode 8的设计光谱和放大系数

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摘要

Eurocode 8-Part 1 accounts for site effects through the suggestion of appropriate elastic design spectra and amplification factors based on different soil classes. The influence of local site conditions is reflected in Eurocode 8 (EC8) spectra with the shape of the PGA-normalized response spectra and the so-called “soil factor” S, which represents ground motion amplification with respect to outcrop conditions. In the present work we use a global strong-motion database, which was compiled in the framework of SHARE FP7 Collaborative Project of the European Union, to evaluate the present EC8 normalized spectra and associated amplification factors for different soil conditions. Uncertainties in the estimation of improved soil amplification factors are captured using a logic-tree approach, which allows the use of alternative models and methods in an effective way. The influence of PGA range of the strong motion records included in the dataset on spectral shape and soil factors is also examined. The results indicate that for all datasets examined, EC8 normalized elastic acceleration spectra match the empirical data to a satisfactory extent, while estimated soil factors for classes C and D are significantly higher than the ones proposed in Eurocode 8. The proposed design spectra and the new amplification factors are validated with a smaller dataset, which includes records only from stations with well documented soil profiles regarding the dynamic soil properties.
机译：欧洲规范第8部分第1部分通过建议合适的弹性设计频谱和基于不同土壤类别的放大系数来说明场地效应。局部场地条件的影响反映在欧洲规范8（EC8）光谱中，具有PGA归一化响应光谱的形状和所谓的“土壤因子” S，代表相对于露头条件的地面运动放大。在当前的工作中，我们使用了一个全球强运动数据库，该数据库是在欧盟SHARE FP7协作项目的框架下编译的，用于评估当前EC8归一化光谱和不同土壤条件下的相关放大因子。使用逻辑树方法可以估算出改良的土壤放大因子的不确定性，从而可以有效使用替代模型和方法。还检查了数据集中包含的强运动记录的PGA范围对光谱形状和土壤因子的影响。结果表明，对于所有检查的数据集，EC8归一化的弹性加速度谱均与经验数据相符，令人满意，而C类和D类的估算土壤因子显着高于Eurocode 8中提出的土壤因子。用较小的数据集验证放大因子，该数据集仅包括来自站的记录，这些站的记录中的土壤剖面与动态土壤特性有关。

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