作　　者： ; ; ; ;

机构地区： 广东省电力设计研究院

出　　处： 《工程勘察》 2013年第5期11-15,共5页

摘　　要： 通过粤东地区一组微风化花岗岩动弹模试验数据的概率密度曲线和累积分布曲线,发现现行规范建议的取值方法存在可靠度不足或过于保守的问题。针对大样本时标准值可靠度下降的情况,建议基于试验数据的累积分布曲线或核密度估计分布进行可靠度估值。通过建立均质弹塑性有限元模型,赋予不同的动弹模进行了动力分析。微风化花岗岩的放大谱和模型顶部反应谱显示,基于核密度估计的可靠度估值能反映动弹模的不确定性。考虑地震动频谱成分的不确定性,动弹模的高值和低值均属不利组合。 According to the probability density curves and cumulative distribution curves of the dynamic elastic modulus which are acquired in the east of Guangdong Province, it is found that the reliability of the evaluation proposed by the current codes is either deficient or conservative. In view of the large samples that contribute to the decline of the reliability, the reliability evaluation based on the test cumulative distribution curves or kernel density estimate distribution is recommended. A series of seismic analysis are processed on slightly weathered granite by using the finite model with different dynamic elastic modulus. The amplification spectrum of models and the response spectra of the model top show that the reliability evaluation based on kernel density estimate can consider the uncertainty of dynamic elastic modulus. Considering the uncertainty of the earth quake spectrum, both the high and low values of the dynamic elastic modulus are the unfavourable combination.

关 键 词： 花岗岩 动弹模 核密度估计 可靠度估值 动力分析

领　　域： [建筑科学] [建筑科学]