腐蚀桥梁缆索的氢脆和腐蚀疲劳研究

发布时间：2018-01-17 02:31

本文关键词：腐蚀桥梁缆索的氢脆和腐蚀疲劳研究　出处：《中外公路》2014年06期 　论文类型：期刊论文

【摘要】：既有悬索桥和斜拉桥的缆索容易遭受腐蚀,影响桥梁安全。通过对不同腐蚀程度的桥梁缆索钢丝试验研究其力学性能和剩余强度。静力试验结果表明:实际腐蚀钢丝的抗拉强度与腐蚀程度关系不大,但当镀锌层消失钢丝开始腐蚀时,其伸长率急剧降低。由于中度腐蚀钢丝的氢累积含量在未受拉和受拉情况下都不大于0.2ppm,所以当氢含量远小于脆断临界浓度0.7ppm时,对钢丝张拉没有影响,表明氢脆可能不会发生。疲劳试验结果表明:当仅有镀锌层发生腐蚀时,疲劳强度变化不大;当腐蚀进入镀锌层下的钢材时,疲劳强度会显著降低;潮湿环境下钢丝的疲劳强度与干燥环境下相比会进一步降低。既有悬索桥的断裂钢丝断面分析表明:其断裂面和腐蚀疲劳断面相同,不是氢脆断裂。
[Abstract]:Cables of both suspension and cable-stayed bridges are vulnerable to corrosion. The mechanical properties and residual strength of cable steel wire with different corrosion degree were studied. The static test results showed that the tensile strength of the actual corroded steel wire had little relationship with the corrosion degree. However, when the galvanized steel wire begins to corrode, the elongation of the steel wire decreases sharply. The hydrogen accumulation of the moderately corroded steel wire is not greater than 0.2 ppm under the condition of no tension or tension. Therefore, when hydrogen content is much less than 0.7ppm critical concentration of brittle fracture, there is no effect on steel wire tensioning, which indicates that hydrogen embrittlement may not occur. The fatigue strength does not change much; The fatigue strength of the steel under the galvanized layer decreases significantly when the steel is corroded under the galvanized layer. The fatigue strength of steel wire in wet environment will be further decreased compared with that in dry environment. The analysis of fracture steel wire section of existing suspension bridge shows that the fracture surface and corrosion fatigue section are the same and not hydrogen embrittlement fracture.
【作者单位】：西南交通大学土木工程学院;
【分类号】：U441.4;U443.38
【正文快照】： 1引言2腐蚀钢丝的力学性能和氢脆桥梁缆索通常由高强度镀锌钢丝组成,许多既有2.1腐蚀试件悬索桥主缆性能都出现退化,主缆钢丝出现严重腐蚀Nakamura,Suzumura and Tarui研究了腐蚀钢和断裂,如布鲁克林大桥、威廉斯堡大桥和其他桥都曾丝的剩余强度,结果如下:进行过大量的腐蚀钢

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