受弯钢构件碳纤维增强复合材料加固理论的研究进展

RESEARCH PROGRESS IN STRENGTHENING THEORY OF BENDING STEEL MEMBERS STRENGTHENED WITH CFRP

钢结构出现损伤可以采用替换和加固两种方式改善其受力性能。工程加固经济效益好、不耽误建筑正常使用,属于首选的修复措施。传统的加固方法一般采用粘贴、焊接、螺栓连接的方式将钢板附加到受损区域,不但增加自身质量,而且导致应力集中。碳纤维增强复合材料(CFRP)具有良好的力学性能和化学稳定性,用于加固修复受损钢结构能够改善其工作性能,延长疲劳寿命。通过对国内外关于CFRP加固钢梁课题研究成果的总结,着重介绍CFRP加固钢梁的抗弯承载力与界面应力分布,循环荷载作用下CFRP加固钢构件的疲劳性能等研究成果,供工程应用和进一步研究参考。

There are two ways to improve the property of damaged steel structures： retrofitting and replacement.The cost of retrofitting is often far less than that of replacement of the whole structure.In addition, retrofitting takes less time, reducing service interruption.So retrofitting is always the first choice to repair steel structures.The traditional retrofit methods are based on the use of steel plates which are attached to the damaged area by adhesive bonding, welding, bolting, which have disadvantages, such as the increment of weight and production of stress concentration etc.Carbon fiber reinforced composite （ CFRP） has excellent chemical properties and stability, when using it for strengthening damaged steel structures, it can improve their working behaviours, prolong fatigue life.It was summarized the research achievements both at home and abroad, such as： the increase of moment carrying capacity, the distribution of interfacial stress, the extending of the fatigue life of structural steel elements, which can be useful for the engineering application or further researches.