基于α截集法的生土窑居模糊随机可靠度分析

Analysis about Fuzzy Random Reliability of Earth-Sheltered Dwellings Based on α Cut Sets

研究生土窑居的模糊随机可靠度,分析黄土力学材料参数对其影响.通过α截集法,将土体力学材料参数的模糊分布离散在区间上,将模糊随机可靠度问题转化为随机可靠度问题;基于强度折减法,建立土体黏聚力、内摩擦角与富裕安全系数的映射关系,用不含交叉项的二次多项式响应面函数代表生土窑居的功能函数,进而进行随机可靠度分析.对河南三门峡陕县的生土窑居的模糊随机可靠度进行了研究,表明该地区生土窑居可靠性较高,营造时选址合理,同时指出:模糊随机可靠指标在一定区间上分布,而模糊验算点为一定值;变异系数的增大将导致模糊随机可靠指标的迅速减小;黏聚力对可靠指标的影响比内摩擦角大.

The fuzzy random reliability of earth-sheltered dwelling is researched in order to analyse the influence of loess mechanical parameters.Based on α cut sets,the fuzzy loess mechanical parameters are distributed in regions,and fuzzy random reliability problem is converted into random reliability problem.Due to strength reduction method,relation between cohesive force,internal friction angle and excess safety factor is established,which is expressed by quadratic polynomial without cross terms and represents the performance function of earth-sheltered dwelling.So the random reliability problem can be solved.The fuzzy random reliability research of earth-sheltered dwelling in Shan city,Henan province shows that,the reliability of earth-sheltered dwelling in this area is high,site selection is reasonable before construct,fuzzy random reliability index is distributed in a region,checking point is constant,fuzzy random reliability index decreases sharply with coefficient of variability increasing,and the influence of cohesive force on reliability index is higher than internal friction angle.