基于AHP&VE的混凝土耐久性分析

Analysis of Concrete Durability Based on AHP&VE

由于耐久性不足造成工程损伤现象日益严重,在设计方案时进行耐久性评估是必要的。以提高混凝土经济性、可持续性为目的,开展了基于AHP&VE的混凝土耐久性分析。首先,结合层次分析法系统分析混凝土耐久性影响因素及其权重值,建立基于AHP&VE混凝土耐久性分析模型,通过一致性检验得到混凝土耐久性影响因素权重向量合集,消除价值工程判断的主观性;其次,针对不同寿命的耐久性方案,构建不同结构可靠度的全生命周期成本分析模型;最后,在耐久性影响因素权重向量集合基础上进一步计算功能系数和价值系数,筛选最优方案,并以案例对模型进行实证。结果表明该模型一致性检验通过,模型可行。

Due to the increasing severity of engineering damage caused by inadequate durability,it is necessary to conduct durability assessment in the design phase.In order to improve the economy and sustainability of concrete,a durability analysis based on AHP&VE(Analytic Hierarchy Process and Value Engineering)is carried out.Firstly,the influential factors and their weight values of concrete durability are systematically analyzed using the analytic hierarchy process.Then,a concrete durability analysis model based on AHP&VE is established,and a consistency test is conducted to obtain a collection of weight vectors for the influential factors of concrete durability,eliminating the subjectivity of value engineering judgment.Secondly,for durability schemes with different lifespans,a life cycle cost analysis model is developed based on different structural reliability levels.Finally,the functional coefficient and value coefficient are calculated based on the collection of weight vectors for durability influential factors,and the optimal scheme is selected.A case study is conducted to validate the model.The results show that the model passes the consistency test and is feasible.