CFRP加固中(重)度劣化钢筋混凝土梁抗弯性能  

Flexural behavior of middle(serious) deteriorated RC beams strengthened with CFRP

作　　者：周淑春[1,2] 吕恒林[1,2] 吴元周[1] 高娟[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,江苏徐州221116 [2]江苏建筑节能与建造技术协同创新中心,江苏徐州221116

出　　处：《中国矿业大学学报》2016年第1期62-69,共8页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51108451);江苏省自然科学基金项目(BK2008128);中国矿业大学大学生创新训练计划项目(X1029015307)

摘　　要：通过对中度和重度劣化的钢筋混凝土梁黏贴碳纤维(CFRP)加固补强,研究混凝土劣化及钢筋锈蚀同时存在状况下加固梁正截面抗弯性能变化规律,探讨钢筋混凝土梁劣化程度、CFRP用量对加固效果的影响.结果表明:CFRP加固劣化梁正截面受弯时有CFRP拉断和CFRP黏结层剪断2种典型破坏模式;加载初期,加固梁承载力满足平截面假定,后期则不满足,且容易发生脆性破坏;位移延性系数μ_△随试验梁劣化程度增加而缓慢降低.破坏时,CFRP拉应变小于极限拉应变.结合试验结果和理论分析,有针对性地建立了与两类典型破坏模式相适应的加固梁正截面受弯承载力计算模型,分析了CFRP用量对加固效果的影响并提出了加固时机确定方法.The middle（seriously）deteriorated beams were strengthened with CFRP and the flexural behaviors were tested.The coupling effect of concrete deterioration and rebar corrosion on the strengthening efficiency was studied,and the influences of deterioration degree and CFRP amount on the strengthening effect were discussed.The results show that two typical failure modes were found when the beams under the ultimate flexural load,tensile failure of CFRP and shear fracture of the bonding layer.At the initial stage of loading,the plane section assumption was applicable,but it disabled at the later stage when it fragilely destroyed.The displacement ductility factorμ△ decreased slowly as the deterioration of RC beams increased.The tensile stress of CFRP was less than its limit value when the beam failed.Calculation models corresponding to the failure modes were established based on the test results and theoretical analysis.The influence of CFRP amount on strengthening effect was analyzed,and then the determining method of strengthening time was proposed.

关 键 词：抗弯性能 加固时机 碳纤维布 钢筋混凝土梁 煤矿地面环境 

分 类 号：TU375[建筑科学—结构工程]