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姚国文,李啸林,刘宇森,等. 基于磁场强度检测的悬索桥缆索锈蚀风险概率计算方法[J]. 科学技术与工程, 2020, 20(23): 9609-9614.
YAO Guo wen,LI Xiao-lin,LIU Yu-sen,et al.Calculation Method of Cable Corrosion Risk Probability of Suspension Bridge Based on Magnetic Field Strength Detection[J].Science Technology and Engineering,2020,20(23):9609-9614.
基于磁场强度检测的悬索桥缆索锈蚀风险概率计算方法
Calculation Method of Cable Corrosion Risk Probability of Suspension Bridge Based on Magnetic Field Strength Detection
投稿时间:2019-07-01  修订日期:2020-05-03
DOI:
中文关键词:  悬索桥缆索结构  加速腐蚀试验  三轴磁场强度  锈蚀评定  风险概率
英文关键词:suspensionbridge cablestructure  acceleratedcorrosion test  three-axismagnetic fieldstrength  corrosionassessment  riskprobability
基金项目:国家重点研发计划课题;国家自然科学基金重大科研仪器研制项目;国家自然科学基金项目
           
作者单位
姚国文 重庆交通大学
李啸林 重庆交通大学
刘宇森 重庆大学
靳永志 重庆交通大学
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中文摘要:
      为了分析和评定服役期内悬索桥缆索结构的锈蚀状态以及屈曲破坏风险概率,开展缆索结构的加速腐蚀试验,通过拟合得到磁场总强度与腐蚀失重率的关系。在已有的抗力概率模型和荷载概率模型研究的基础上,剔除次要因素,通过极限状态方程建立缆索结构锈蚀屈曲破坏风险概率计算方法。文章以某大跨径悬索桥为背景,根据三轴磁场强度检测结果,判断缆索结构的锈蚀状况,通过现场检测数据建立悬索桥有限元模型,计算缆索的抗力概率模型、荷载概率模型,从而得到悬索桥在当前缆索系统锈蚀状态下的破坏率。结果表明:随着试样腐蚀率的增加,磁场总强度呈现下降趋势,且其测值越离散。锈蚀评定方法能够较好的拟合磁场总强度和腐蚀失重率的关系。基于现场锈蚀评定和有限元模拟建立的悬索桥缆索结构锈蚀风险概率计算方法切实可行。
英文摘要:
      In order to analyze and evaluate the corrosion state and the probability of buckling failure of the cable structure of suspension bridge during the service period, accelerated corrosion test of the cable structure was carried out, and the relationship between the total strength of the magnetic field and the corrosion loss was obtained by fitting. Based on the existing research on the resistance probability model and the load probability model, the secondary factors are eliminated, and the risk calculation method of the corrosion buckling failure of the cable structure is established by the limit state equation. Based on the large-span suspension bridge, the paper judges the corrosion condition of the cable structure based on the test results of the three-axis magnetic field strength. The finite element model of the suspension bridge is established by the field strength test data, and the resistance probability model and load probability model of the cable are calculated to obtain the failure rate of the cable system of suspension bridge in current corrosion state. The results show that as the corrosion rate of the sample increases, the total magnetic field strength shows a downward trend, and the measured value is more discrete. The corrosion evaluation method can better fit the relationship between the total magnetic field strength and the corrosion loss rate. The calculation method of corrosion risk probability of the suspension bridge cable structure which established by the corrosion assessment and finite element simulation is feasible.
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