腐蚀环境下斜拉索高强钢丝退化状态研究

发布时间：2018-01-14 03:22

本文关键词：腐蚀环境下斜拉索高强钢丝退化状态研究　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：大量对斜拉索的检查表明,由于环境因素的不断侵蚀，斜拉索内高强钢丝的严重腐蚀是斜拉索失效的主要机制之一。索内钢丝的长期劣化过程需同时考虑均匀腐蚀、点蚀以及由环境侵蚀和循环荷载共同作用而引起的腐蚀的影响。本文首先通过实验室人工加速腐蚀试验得到腐蚀程度各异的高强钢丝试样，并通过表面粗糙度测量试验对高强钢丝均匀腐蚀深度和点蚀深度进行评估，发现均匀腐蚀深度服从对数正态分布，并且在镀锌层腐蚀阶段和钢内芯腐蚀阶段都与腐蚀时间有线性正相关关系，不同腐蚀工况下的最大点蚀系数服从GUMBEL分布，其回归模型的形状和位置参数可由试验所得的最大点蚀系数数据分析得到，高强钢丝点蚀深度的极值分布模型即可由均匀腐蚀模型和点蚀系数模型预测得到；再通过对锈蚀后的高强钢丝进行单轴力学拉伸试验，得到包括屈服强度、极限强度、弹性模量在内的材料力学指标的分布规律；最后通过对实际桥索结构中替换下来的斜拉索内高强钢丝进行相关试验、评定，以探求实验室试验结果与实际服役桥索内钢丝真实退化状态的一致性。本文针对实验室条件和真实服役条件下斜拉索内高强钢丝，系统地进行了理论和试验研究，为保障大跨度斜拉桥的服役性能和安全水平提供了试验和理论基础，，具有重要的社会意义。
[Abstract]:A check on the cable show that due to the environmental factors of erosion, severe corrosion in high strength steel wire cable is one of the main mechanisms of cable failure. The deterioration process of wire cable should be considered uniform corrosion, pitting corrosion and erosion by environment and cyclic load caused by the corrosion effects in this paper. Firstly, through laboratory accelerated corrosion test specimens of high-strength steel wire artificial corrosion in varying degrees, and the surface roughness measurement test on high strength steel wire corrosion depth and pit depth evaluation, uniform corrosion depth obeys the lognormal distribution, and the corrosion of galvanized layer and steel corrosion in the core stage stage has a linear correlation with the etching time, the maximum coefficient under the condition of different pitting corrosion obey GUMBEL distribution, the regression model of shape and position parameters can be obtained by test The maximum pitting factor data analysis, to the extreme value distribution model of high strength steel wire pitting depth by uniform corrosion and pitting factor prediction model; then based on the uniaxial tensile test of high-strength steel wire after corrosion, including yield strength, ultimate strength, elastic modulus, distribution regularity of mechanics of materials; finally based on the actual bridge cable cable replaced structure in high strength steel wire for test, evaluation, to explore the laboratory test results consistent with the actual service bridge wire degradation state. The real plane
According to the laboratory conditions and actual service conditions of cable in high strength steel wire, a systematic theoretical and experimental research, provides a theoretical and experimental basis for the service performance and safety guarantee of long-span cable-stayed bridge, which has great social significance.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.38;U448.27

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