FRP布置方式对含裂纹钢板加固后的疲劳性能影响分析

发布时间：2018-01-28 21:52

本文关键词： FRP 布置方式疲劳应力强度因子裂纹扩展寿命加固　出处：《土木工程学报》2015年01期 　论文类型：期刊论文

【摘要】：以FRP加固的含中心裂纹和单边裂纹钢板为研究对象,在等刚度加固条件下,对FRP平铺和叠加方式加固的含裂纹钢板的疲劳性能进行研究,比较两种布置方式加固的含裂纹钢板的应力强度因子和裂纹扩展寿命,并对影响因素进行参数分析。结果表明,FRP布置方式对含裂纹钢板的疲劳性能有明显影响。对于含中心裂纹钢板,两种布置方式加固后钢板的裂纹扩展寿命比值受FRP厚度和初始裂纹长度的影响较大,在文中试件参数下,叠加与平铺方式加固试件的裂纹扩展寿命比值为0.620~1.063。对于含单边裂纹钢板,叠加方式的加固效果明显好于平铺方式,并随着FRP厚度和胶层厚度的增加,叠加方式相比于平铺方式的优势更加明显,在文中试件参数下,叠加方式的裂纹扩展寿命可以达到平铺方式的3倍以上。最后,提出实际工程加固中FRP的布置建议。
[Abstract]:The fatigue behavior of cracked steel plate with center crack and unilateral crack strengthened by FRP was studied under the condition of equal stiffness reinforcement. The fatigue behavior of cracked steel plate strengthened by FRP tile and superposition was studied. The stress intensity factor and crack propagation life of cracked steel plate strengthened by two arrangement methods are compared, and the parameters of influencing factors are analyzed. The FRP arrangement has a significant effect on the fatigue properties of cracked steel plates. The ratio of crack propagation life of the steel plate strengthened by two kinds of arrangement is greatly affected by the thickness of FRP and the initial crack length, under the parameters of the specimen in this paper. The ratio of crack growth life between superposition and flattening is 0.620 ~ 1.063. For steel plate with unilateral crack, the effect of superposition is better than that of tile. With the increase of the thickness of FRP and the thickness of the rubber layer, the advantages of the stacking method are more obvious than that of the tiling method, under the parameters of the specimen in this paper. The life of crack propagation in superposition mode can be more than three times of that of flat way. Finally, the arrangement suggestion of FRP in practical engineering reinforcement is put forward.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;
【基金】：国家973计划(2012CB026200) 国家自然科学基金(51178099) 国家高技术研究发展计划(2012AA03A204) 国家国际科技合作专项项目(2012DFG20510)
【分类号】：TU392.4
【正文快照】： 引言随着外贴纤维增强复合材料(FRP)加固技术在混凝土结构加固修复中的成功应用[1],近年来,应用FRP加固钢结构正在引起研究者的广泛兴趣,但目前国内外关于此方面的研究还相对较少。已有关于FRP加固钢结构弯曲性能[2]、受压性能[3]、疲劳性能[4]等方面的研究,但大部分仍集中在

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