基于灰色聚类的砌体结构安全性模糊综合评价方法研究

发布时间：2018-01-05 02:17

本文关键词：基于灰色聚类的砌体结构安全性模糊综合评价方法研究　出处：《西南交通大学》2016年硕士论文　论文类型：学位论文

【摘要】：论文针对目前已有砌体结构安全性评价方法中,定性评价方法很难反映同一安全等级的差异,定量评价法运用难度大的问题,开展砌体结构安全性的定量评价方法研究。根据层次分析法的基本思想,结合砌体结构正常使用荷载条件下的受力特点,建立了将砌体结构划分为子单元、子项和检查项三个层次的层次评价模型。该评价模型将砌体结构划分地基基础、上部结构两个子单元,将子单元划分为地基、基础、墙柱、墙、梁、楼板、女儿墙等子项,将子项划分为承载能力、变形、构造、裂缝、整体性等检查项。基于层次评价模型,将模糊数学理论和灰色聚类理论引入砌体结构的安全性评价当中,利用e0/5～e8/5标度法构造的判断矩阵,利用广义特征根法计算出模糊权向量,根据结构实测数据,通过构建白化函数计算出聚类系数矩阵,并作为子项的综合评判矩阵,建立了砌体结构安全性三级模糊综合评价方法,并通过工程实例验证了其具体应用和可行性。结果表明,将层次分析、灰色理论和模糊数学理论综合运用,所建立的基于灰色聚类的砌体结构安全性模糊综合评价方法,可以定量的评价结构整体的安全等级,全面反映各影响因素对结构安全性的影响,不仅概念清晰,而且易于操作。
[Abstract]:In view of the existing methods of safety evaluation of masonry structure, qualitative evaluation method is difficult to reflect the difference of the same safety grade, and it is difficult to apply quantitative evaluation method. According to the basic idea of Analytic hierarchy process (AHP) and combined with the stress characteristics of masonry structure under normal use load, the masonry structure is divided into sub-units. The evaluation model divides masonry structure into foundation, superstructure two subelements, subunits into foundation, foundation, wall column, wall, beam, floor. The sub-items such as parapet are divided into carrying capacity, deformation, structure, crack, integrity, etc. Based on hierarchical evaluation model. The fuzzy mathematics theory and grey clustering theory are introduced into the safety evaluation of masonry structure. The fuzzy weight vector is calculated by using the judgment matrix constructed by e0 / 5 / 8 / 5 scale method and the generalized characteristic root method. According to the measured data of the structure, the clustering coefficient matrix is calculated by constructing the whitening function, and the comprehensive evaluation matrix is used as the subterm, and the three-level fuzzy comprehensive evaluation method for the safety of masonry structure is established. The application and feasibility of the method are verified by an engineering example. The results show that the AHP, grey theory and fuzzy mathematics theory are applied comprehensively. The fuzzy comprehensive evaluation method of masonry structure safety based on grey clustering can quantitatively evaluate the overall safety grade of the structure and reflect the influence of various factors on the safety of the structure, not only the concept is clear. And easy to operate.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU364

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