地基液化评价的模糊不确定性分析  

Fuzzy reliability analysis of soil liquefaction evaluation

作　　者：袁启旺[1] 佘跃心[1] 

机构地区：[1]淮阴工学院建筑工程学院,江苏淮安223003

出　　处：《四川建筑科学研究》2010年第4期130-134,共5页Sichuan Building Science

基　　金：淮阴工学院自然科学基金项目(HGB0914)

摘　　要：基于世界范围内19次中强震的CPT液化案例,通过构建客观性较强的液化隶属函数映射地基液化模糊性;基于LOG ISTIC模型导出地基抗液化强度CRR曲线及其概率密度函数;借用中国华北地区地震动加速度衰减关系,构建CSR的概率密度函数,进而分析地基液化评价的模糊不确定性。结果表明,忽略地基液化评价的模糊不确定性,评价结果可能偏于危险;基于模糊不确定性的地基液化评价工程意义较为明显,可作为规范方法的有益参考。Apart from the random uncertainty,the fuzzy uncertain must also be involved in the evaluation of soil liquefaction.According to the field testing liquefaction data of cone penetration test from 19 strong earthquakes around the world,the fuzzy membership function is established,and the CRR curves is developed using logistic model,through which the PDF and the statistics for CRR are deduced.Then the empirical acceleration attenuation law in Northern China area is employed to derive PDF and the statistics for CSR in the sense that the maximum of acceleration is the dominant factor producing the CSR variation.Through theoretical and contractive analyses on a representative sample,the fuzzy liquefaction probability can systematically,quantificationally consider the fuzziness and randomness of soil liquefaction compared with the traditional methods,and the decision-making based on the analysis of the fuzzy reliability will more agree to the property of the engineering.It can be used as a significant reference of the code.

关 键 词：地基液化 隶属函数 概率密度函数 模糊不确定性 

分 类 号：TU470[建筑科学—结构工程]