余芳，贾金青，宋玉普（大连理工大学海岸和近海工程国家重点实验室，大连 116024）

［摘要］对不同钢绞线腐蚀率下的部分预应力混凝土梁进行了静力和疲劳试验，通过分析开裂弯矩、跨中挠度、受拉区钢筋应变以及梁裂缝的发展规律，研究了钢绞线腐蚀率对部分预应力混凝土梁疲劳性能的影响。研究表明：钢绞线腐蚀会显著降低梁的疲劳寿命，是影响梁疲劳破坏形态的主要因素；腐蚀梁的挠度、应变和裂缝发展同样遵循无腐蚀梁的“三阶段”规律；在相同疲劳次数下，腐蚀率越大，受拉区非预应力钢筋的应变和梁的裂缝宽度越大，但梁跨中挠度受腐蚀率影响不显著。

［关键词］钢绞线腐蚀； 预应力混凝土梁； 疲劳性能

中图分类号：TU378-2文献标识码：A文章编号：1002-848X(2012)01-0097-04

Experimental research on fatigue behavior of prestressed concrete beams with corroded steel strands

Yu Fang, Jia Jinqing, Song Yupu(State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China)

Abstract:The crackingmoment, midspan deflection, strain of steel in the tension region and the law of crack development were analyzed from the experiment of partly prestressed concrete beams, with different corrosion rates and under static and fatigue loads. On this basis, the effects, which corrosion rates of the steel strands have on the fatigue behavior, were studied. The results indicate that corrosion of steel strands,as a major factor to effect the failure mode of testing beams, can remarkably reduce the fatigue life of the beams. The deflection, strain and crack development of testing beams with corrosion, likewise, follow the regulation of “3-step” in the beams with non-corrosion. More the corrosion rate is, more the strain of normal steel in the tension region and the crack width of the beams are, with the same corrosion cycle, but the corrosion rate has a little influence on the midspan deflection.

Keywords:corrosion of steel strands； prestressed concrete beam； fatigue behavior

*科技部“863”计划重大交通基础设施核心技术项目（2007AA11Z133）。

作者简介：余芳，博士研究生，Email：xn_yufang@yahoo.com.cn。

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