地震地面运动的模糊随机模型

未来地震地面运动不仅具有随机性而且具有强烈的模糊性。这种模糊性是由于地震烈度和场地土类別的定义和评定标准的模糊性所引起的,在其模型中应该予以考虑。 本文从不同特征和条件的工程实际出发,在充分考虑上述模糊性和随机性的基础上,提出了地震地面运动的两种模糊随机模型。第一种模型是在预测地震烈度和应用地震反应谱的基础上建立起来的;第二种模型是在现有的随机过程模型的基础上,通过引进适当的模糊参数而建立起来的。 

FUZZY-RANDOM MODELS OF EARTHQUAKE GROUND MOTION

The models of future earthquake ground motion, besides randomness, have strong fuzziness owing to the ambiguous definitions and norms for evaluation of the intensity degrees and the site soil classification.The forms to express the fuzziness and randomness of the model should be different for problems with different characters and conditions. But mainly there are two kinds of models for earthquake ground motion. The first kind of model is based on the prediction of the fuzzy earthquake intensity and the use of earthquake response spectrum. The other kind of model is a fuzzy random process which at present must be simplified as a random process with fuzzy parameters.Key Words: Fuzzy intensity, Fuzzy predictive intensity, Fuzzy response spectrum, Earthquake ground motion, Fuzzy power spectrum, Fuzzy random process.