徐变是混凝土桥梁结构耐久性和安全性的重要影响因素，同时混凝土徐变特性又受到诸多内部和外界因素影响。基于主成分分析法，建立混凝土桥梁徐变影响因素指标体系，选取54组混凝土徐变试验数据作为样本数据，分析混凝土桥梁徐变影响因素敏感性。研究结果表明：主成分分析方法可得出各项因素对混凝土桥梁徐变影响力度，适用于混凝土徐变影响因素敏感性分析；水泥用量、集料含量、水灰比和构件有效厚度等因素对混凝土桥梁徐变影响最大；减水剂含量对混凝土桥梁徐变影响则甚小。%Creep is an important factor for the durability and safety of concrete bridges.And creep is affected by numerous internal and external factors.The index system of concrete creep is established. This paper analyze the sensitivity of factors influencing concrete bridge creep by Principal Component A-nalysis(PCA)in the base of 54 groups sample data.The results show that PCA can calculate the impact of factors for concrete bridge creep;cement content,aggregate content,water cement ratio and effective thickness has a greater impact on the concrete bridge creep and superplasticizer has a less impact.
展开▼
