生土窑居参数灵敏度分析的新方法  

A new method of parameters' sensitivity analysis for earth-sheltered dwellings

作　　者：郭平功[1,2] 童丽萍[1] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]河南城建学院土木工程系,河南平顶山467036

出　　处：《西安建筑科技大学学报（自然科学版）》2013年第2期216-221,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50978233)

摘　　要：生土窑居广泛分布于64万平方公里的黄土高原,黄土土质千差万别,窑居构造尺寸无一雷同,均体现出随机性,适合从可靠度方面分析黄土材料、窑居尺寸对生土窑居可靠性的影响,即对各参数的灵敏度进行分析.提出了标准差区间梯度法,把随机变量分为抗力项和荷载项,依次分析各随机变量在标准差区间上的结构响应,每个标准差区间上结构响应的梯度用于比较灵敏度的大小.对河南三门峡陕县的生土窑居参数的灵敏度进行了分析,表明该地区生土窑居的可靠性较高,内摩擦角和窑跨的灵敏度较小,粘聚力和窑腿宽度的灵敏度最大,是影响抗灾可靠性的关键因素.Earth-sheltered dwellings are widely distributed on Loess Plateau that is abound 640 thousand square kilometers. The property of loess and geometric size of dwellings are very different, which are all random. It＇s appropriate to analyse the influence of loess property and geometric size in reliability aspect, in other words, to analyse the sensitivity of every random variables. Method of standard deviation interval＇s gradient is proposed. The random variables are divided to resistance terms and load terms. The structural response is analyzed on standard deviation intervals with every random variable, and the gradient of structural response on each standard deviation interval is used to evaluate the sensitivity of random variables. The random variables research of earth-sheltered dwellings in Shanxian County, Henan Province shows that the disaster resistanting reliability is high; the sensitivity of internal friction angle and span of cave are the smallest; and the sensitivity of cohesion and cave leg width are the biggest, which are the key factor of disaster resistanting reliability.

关 键 词：标准差区间 梯度 灵敏度 粘聚力 窑腿宽度 

分 类 号：TU761.2[建筑科学—建筑技术科学]