预应力碳纤维布加固损伤梁疲劳性能试验研究  

EXPERIMENTAL RESEARCH ON FATIGUE PERFORMANCE OF DAMAGED BEAMS STRENGTHENED WITH PRESTRESSED CFRP SHEETS

作　　者：徐春林[1] 艾军[1] 陈斌 林森 陆耀清[1] 

机构地区：[1]南京航空航天大学土木工程系,南京210016 [2]浙江杭金衢高速公路有限公司,杭州310004

出　　处：《工业建筑》2011年第7期129-132,共4页Industrial Construction

基　　金：浙江省交通厅科研项目基金(2008H01)

摘　　要：目前,对预应力碳纤维增强复合材料CFRP布加固损伤梁疲劳性能研究很少。首先,设计一套杠杆型疲劳试验加载体系,并对张拉锚固装置进行完善。对3根试验梁进行相同程度预裂损伤后,对损伤梁进行不同预应力水平CFRP布加固;最后,对加固后的损伤梁进行疲劳试验。试验结果表明:对CFRP布施加预应力能限制裂缝的发展,提高加固梁的刚度,降低CFRP布应变幅和钢筋应变幅,从而使加固梁的疲劳寿命有较大幅度的提高,并且预应力水平越高,加固梁疲劳性能的改善越明显。Experimental research on fatigue performance of damage beams strengthened with prestressed CFRP sheets is seldom.Based on lever principle,a new loading system for fatigue experiments has been designed.And the tension and anchorage devices were perfected.Three beams,which are presplitted identically,strengthened with CFRP sheets under different pre-stress levels were tested under fatigue load.Results show that the application of prestressing force can restrict cracks propagation,improve the rigidity,reduce the strain of the reinforcement and CFRP,thus the fatigue life of the strengthened beams are increased apparently.Meanwhile,the more the pre-stress level increases,the more the fatigue performance of the strengthened beams improved.

关 键 词：预应力CFRP布 损伤梁 加固 疲劳性能 疲劳试验加载体系 

分 类 号：TU375.1[建筑科学—结构工程]