氯盐腐蚀钢绞线的断裂抗力分布模型  

Distribution Models of the Fracture Resistance of Steel Strands Corroded by Chloride

作　　者：李富民[1,2] 袁迎曙[1,2] 张建清[1,2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室 [2]中国矿业大学建筑工程学院,江苏徐州221008

出　　处：《土木建筑与环境工程》2009年第6期34-39,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金资助项目(50478100;50538070);徐州市社会发展基金资助项目(2006-15;XM07C082)

摘　　要：为获得腐蚀钢绞线的断裂失效概率模型,需要研究基于某种断裂准则的断裂抗力分布模型。首先提出了以塑性理论中的Mises应变作为断裂参量的腐蚀钢绞线的断裂准则,然后通过对14根氯盐腐蚀钢绞线试样的拉伸试验获得了46根断裂钢丝以及它们在拉断时的平均拉应力及断口处蚀坑的几何形状与尺寸,并采用ANSYS有限元软件模拟得到了每根钢丝的断裂抗力值;以此作为腐蚀钢绞线断裂抗力分布的数据样本,采用数理统计软件SPSS分析了其分布特征,结果表明,在0.05的显著性水平下,腐蚀钢绞线的断裂抗力不拒绝正态分布及对数正态分布,并得到了这两种分布模式下腐蚀钢绞线断裂抗力的分布模型(概率密度函数)。Mises strain from plastic theory was put forward to be the fracture criterion of corroded steel strands. By tension tests of 14 corroded steel strands with chloride, 46 breaking wires were obtained with the mean tension stress and the geometric configuration of the pit. Based on the above, the fracture resistance of each breaking wire was simulated by the finite element software ANSYS. And the simulation results were addressed to analyse the characteristics of fracture resistance with SPSS software. It was found that at the significance level of 0.05, both normal distribution and logarithmic normal distribution were not refused for the fracture resistance distribution. Hence, the distribution models （percentage distribution function） were obtained under the two distribution modes.

关 键 词：预应力混凝土 耐久性 氯盐环境 钢绞线腐蚀 断裂抗力 分布模型 

分 类 号：TU511.3[建筑科学—建筑技术科学] TU378.1