This paper proposes a method for life-cycle evaluation of bridge with steel-frame structure in highway,based on fuzzy rough set theory.Firstly,we collected index data of life-cycle evaluation and used the fuzzy rough set theory to carry out dimensionless process to initial evaluation index data,then worked out objective weights of evaluation index and named all attribute value in one evaluation module as a fuzzy set integrated with specialist scoring theory.Moreover,the research provided the evaluation module with degree of membership relative and obtained subjective weight of index.In addition,we acquired fuzzy approximation relation existing in two fuzzy sets integrated with comprehensive subjective and objective weight,and built state-transition matrix of evaluation index probability integrated with Markov chain theory to obtain vector of state stability.Finally,we obtained the development trend of construction of high-speed tunnel and value of comprehensive evaluation integrated with weights.Simulation results show that the method can improve evaluation precision.The stability of evaluation is optimal.%对路中钢架结构桥梁生命周期进行评估,可提高路中钢架结构桥梁的使用寿命.进行桥梁生命周期评估时,应将公路生命周期评估指标的主观权重和主客观权重结合,结合状态稳定向量计算综合评估值,但是传统方法通过分析公路中钢架结构桥梁施工过程中的能源消耗状况完成评估,但是不能计算评估指标的主观权重和主客观权重,无法准确计算综合评估值,降低了评估的准确性.提出一种基于模糊粗糙集理论的公路中钢架结构桥梁生命周期评估方法.上述方法先采集公路中钢架结构桥梁生命周期的评估指标数据,利用模糊粗糙集理论对原始的评估指标数据进行无量纲化处理,计算出评估指标的客观权重,结合专家评分理论将某一评估模块内的全部属性值称为一个模糊集合,给出指标相对于评估模块的隶属度,获得公路生命周期评估指标的主观权重,综合主客观权重,得到两个模糊集合存在的模糊近似关系,结合马尔科夫链理论组建公路生命周期评估指标概率状态转移矩阵,获得状态稳定向量,结合权值获得高速隧道建设发展趋势以及综合评估值.仿真实验证明,所提方法能够有效提高公路中钢架结构桥梁生命周期评估精度,评估稳定性较优.
展开▼
