索承式桥梁腐蚀吊索钢丝蚀坑特征研究
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摘要
首先介绍了袁州大桥腐蚀钢丝蚀坑4种常见形貌,然后利用39根袁州大桥拆除得到的腐蚀旧钢丝分析研究了钢丝腐蚀蚀坑的三维尺寸分布特征,进行蚀坑几何参数的量测和统计,记录每个蚀坑的长度、宽度(弦长)和深度。数理统计表明蚀坑三维尺寸复杂,离散性大,蚀坑长度、宽度和深度较符合对数正态分布。利用分形理论研究了钢丝蚀坑尺寸的特征及蚀坑发展规律,研究表明腐蚀蚀坑三维尺寸具有明显分形特征,长度维数和深度维数随着失重率的增加而增加,宽度维数随着失重率的增加而降低。
In this paper,four common morphologies of corroded wires pits from Yuan-zhou bridge were introduced firstly. Then,the corrosion pit 's distribution characteristics of wires from Yuan-zhou bridge were analyzed,and the profile features of corroded wires were analyzed too. Statistics show that 3D dimension of corrosion pit is complex,and the data are discrete,and the pit length,width and depth are consistent with the lognormal distribution. The distribution characteristics of pit and profile were studied by using of fractal theory. Research shows that the corrosion pit dimensions and wire profile have obvious fractal features,and the length dimension increases with the increase of weight loss rate,and the width dimension decreases with the increase of weight loss rate,and the depth dimension increases with the weight loss rate.
In this paper,four common morphologies of corroded wires pits from Yuan-zhou bridge were introduced firstly. Then,the corrosion pit 's distribution characteristics of wires from Yuan-zhou bridge were analyzed,and the profile features of corroded wires were analyzed too. Statistics show that 3D dimension of corrosion pit is complex,and the data are discrete,and the pit length,width and depth are consistent with the lognormal distribution. The distribution characteristics of pit and profile were studied by using of fractal theory. Research shows that the corrosion pit dimensions and wire profile have obvious fractal features,and the length dimension increases with the increase of weight loss rate,and the width dimension decreases with the increase of weight loss rate,and the depth dimension increases with the weight loss rate.
引文
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[10]彭修宁,张喜德,韦树英.钢筋宏电池腐蚀锈坑尺寸的二维模型[J].广西大学学报,2006,31(01):64-66.
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[14]孔正义.腐蚀钢构件疲劳性能退化试验研究[D].西安:西安建筑科技大学,2010.
[15]张济忠.分形[M].北京:清华大学出版社,1995.
[2]H.R.Hamilton III.J.E.Breen and K.H.Frank.Investigation of Corrosion Protection Systems for Bridge Stay Cables.Research Report No.1264-3F.Center for Transportation Research,Bureau of Engineering research[z].University of Texas at Austin.November.1995.
[3]李宏江,王江,张永明,等.天津永和斜拉桥换索后的索力调整[J].公路交通科技,2008,25(10):79-83.
[4]周诚华,梅秀道.南昌市八一大桥斜拉桥换索工程施工监控[J].世界桥梁,2011(2):73-76.
[5]谢福君,廖龙辉.衡山湘江公路大桥换索方案研究[J].公路,2013(4):21-24.
[6]朱劲松,肖汝诚.大跨度斜拉桥拉索安全性分析方法研究[J].土木工程学报,2006,39(09):74-79.
[7]S.M.Elachachi,D.Breysse,S.Yotte,C.Cremona.A probabilistic multi-scale time dependent model for corroded structural suspension cables[J].Probabilistic Engineering Mechanics,2006,21(03):235-245.
[8]马小利,王立彬,丁盛.平行钢索的锈蚀时变失效概率分析[J].工程力学,2012,29(04):210-216.
[9]王波,袁迎曙,陈瑞.氯盐侵蚀钢筋表面的坑蚀特征及蚀坑演变规律[J].中国矿业大学学报,2011,40(02):240-245.
[10]彭修宁,张喜德,韦树英.钢筋宏电池腐蚀锈坑尺寸的二维模型[J].广西大学学报,2006,31(01):64-66.
[11]章刚,闫五柱,王晓森,等.铝合金点蚀对应力集中系数影响的分析[J].强度与环境,2009,36(04):11-18.
[12]Mandelbrot B B.Fractals:Form,chance and dimension[M].CA:Freeman,1977.
[13]李富民,袁迎曙.氯盐腐蚀钢绞线蚀坑几何尺寸的分布特征[J].煤炭学报,2011,36(11):1826-1831.
[14]孔正义.腐蚀钢构件疲劳性能退化试验研究[D].西安:西安建筑科技大学,2010.
[15]张济忠.分形[M].北京:清华大学出版社,1995.