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。
The FRP-strengthened steel plates with an initial central crack or an initial single-edge crack were investigated,respectively,with the finite element method. Under the equivalent tensile stiffness of FRP laminates,the tiled and stacked FRP configurations employed to strengthen the cracked steel plates were investigated for the effect of FRP configurations on the fatigue behavior of the plates. Furthermore,the stress intensity factor and the crack growth life of FRP-strengthened steel plates were compared,and meanwhile the parameter analysis was also conducted. The results show that the fatigue behavior of FRP-strengthened steel plates may be significantly affected by the FRP configurations.For the specimens with an initial central crack,the ratios of crack growth life of specimens strengthened by the stacked and tiled FRP configurations may be obviously influenced by the thickness of FRP and the initial crack length,and the ratios of crack growth life ranged from 0. 620 to 1. 063. For the specimens with a single-edge crack,the strengthening effect of the stacked FRP was apparently better than that of the tiled FRP,and the superiority of the stacked FRP over the tiled FRP was more evident with the increase of the FRP thickness and the adhesive thickness. The crack growth life of the specimen strengthened by the stacked FRP can be three times that of the tiled FRP. In the end,a design guideline was recommended for practical engineering applications.
出处
《土木工程学报》
EI
CSCD
北大核心
2015年第1期56-63,共8页
China Civil Engineering Journal
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)
