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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第9卷    第6期    总第50期    2012年12月

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文章编号:1672-7029(2012) 06-0013-05
无粘结预应力钢绞线锈蚀损伤分析
李政1,2,罗小勇1

(1.中南大学土木工程学院,湖南长沙410075; 2.湖南中大设计院有限公司,湖南长沙410075)

摘 要: 通过采用加速锈蚀试验,研究无粘结预应力钢绞线在不同锈蚀条件下的力学性能指标随锈蚀率的变化规律,对比分析钢绞线在正常锈蚀和局部锈蚀条件下的名义极限强度、名义弹性模量、伸长率的差异,提出非截面积减小因素下的锈蚀对钢绞线的损伤。研究结果表明:锈蚀对钢绞线材性的影响不仅仅在于截面积的减少,锈蚀损伤主要原因在于锈蚀产生的腐蚀坑而形成的应力集中现象对钢绞线力学性能的严重影响; 通过对比分析正常锈蚀和局部锈蚀下钢绞线的力学性能的差异,得到排除截面积减小影响下的名义极限强度锈蚀损伤比,并对锈蚀钢绞线进行损伤分析,得出锈蚀率与锈蚀损伤变量的关系。

 

关键字: 锈蚀;钢绞线;力学性能;锈蚀损伤比;锈蚀损伤变量

Corrosion damage analysis of unbonded prestressed steel strand
LI Zheng1,2,LUO Xiao-yong1

1.School of Civil Engineering,Central South University,Changsha 410075,China;
2.Hunan Zhongda Design Institute Co.Ltd,Changsha 410075,China

Abstract:Based on the accelerated corrosion tests,the variation regulations of unbonded prestressed steel strand’s mechanical performance along with corrosion ratio changed in different corrosion conditions were studied.By a comparative analysis of the steel strand difference of nominal ultimate strength,nominal elastic modulus and elongation ratio under the normal corrosion and the partial corrosion,it was put forward tha the corrosion damage of steel strand without regard to the factor of cross-section reduction.The results show that the influence corrosion has on steel strand mechanic performance is not merely cross-section reduction,and the primary cause of corrosion damage lays in the stress concentration phenomenon caused by the pit of corrosion.By a comparative analysis of the difference of mechanical performance under normal corrosion and partial corrosion,corrosion damage proportion of nominal ultimate strength ignoring the factor of cross-section reduction is obtained.By analysizing of corrosion damage about steel strand,the relationship between corrosion rate and the corrosion damage variable is also obtained.

 

Key words: corrosion; steel strand; mechanical performance; corrosion damage proportion; corrosion damage variable

ISSN 1672-7029
CN 43-1423/U

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