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EXPERIMENTAL STUDY AND SIMULATION ANALYSIS ON CORRODED BARS IN CONCRETE AT THE MARINE CYCLE
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摘要: 75根海水浪溅环境下混凝土中I级和II级锈蚀钢筋的拉伸试验表明:要考虑由于锈坑引起的应力集中对强度的影响。讨论了屈服强度、极限强度、极限伸长率和破坏形式与重量锈蚀率的关系,分析了钢筋的应力应变关系和极限强度与屈服强度比值随锈蚀率提高的变化规律。海水浪溅环境比大气环境下的锈蚀钢筋承载能力低15%左右,截面损失率与重量损失率的差异要小。锈蚀钢筋有限元仿真分析表明:锈坑引起的应力集中使屈服荷载比仅考虑面积减小的计算荷载低50%左右;初始直径越大,锈坑对强度的影响越小;锈坑形状和宽度对强度的影响不明显。数据存在一定离散性,对可能原因进行了分析。Abstract: Experimental study on the mechanical properties of 75 corroded rebars I and II in marine concrete is carried out.It is discussed the relationship between yielding strength, ultimate strength, ultimate elongation rate, failure type stress-strain curve and the ratio of ultimate strength to yielding strength of reinforcement steel and the corrosion rate. The comparative analysis of mechanical properties between rebars in atmospheric and marine environment is also presented. Simulation analysis of bars with different diameters and different corrosion pit is also carried out. Corrosion has less effect on the rebars with large diameter than small diameter. The shape and width of corrosion pit have no great effect on the strength of corroded rebars. The reason for the data scatter is analyzed at last.
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Key words:
- marine cycle /
- corroded bars /
- mechanical properties /
- pit corrosion /
- stress concentration /
- simulation analysis
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