预应力CFRP与钢板复合加固T梁抗弯性能试验  

Experimental Research on Flexural Behavior of T-Beams Strengthened with Combination of Prestressed CFRP and Steel Plate

作　　者：朱广山 朱浮声[1] 盛国华 ZHU Guang-shan;ZHU Fu-sheng;SHENG Guo-hua(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;School of Transportation Engineering’Shenyang Jianzhu University,Shenyang 110168,China;School of Architecture and Civil Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]沈阳建筑大学交通工程学院,辽宁沈阳110168 [3]沈阳工业大学建筑与土木工程学院,辽宁沈阳110870

出　　处：《东北大学学报（自然科学版）》2018年第4期594-598,共5页Journal of Northeastern University(Natural Science)

基　　金：辽宁省教育厅基金资助项目(201564060);辽宁省自然科学基金资助项目(201602602)

摘　　要：通过对10根T梁进行抗弯试验,研究了不同CFRP预应力程度、CFRP加固层数及预裂程度对CFRP与钢板复合加固T梁的荷载、跨中挠度及延性系数的影响规律.结果表明:复合加固T梁的极限荷载Pu高于对比梁的90%以上.预应力程度对极限跨中挠度f_(max)及延性系数μ影响明显,预应力每提高5%,f_(max)降低约25%.屈服荷载Py与极限荷载Pu随加固层数的增加线性增大,随预裂程度的增加线性减小.3层比1层CFRP梁的Pu提高了52.8%.预裂程度为60%时,f_(max)降低约10%.Through the experiments on the flexural behaviors of 10 pieces of T-beams,the influence of different prestress degrees’numbers of strengthening layers of CFRP as well as the pre-splitting degree on the load,midspan deflection and ductility factor of T-beams strengthened by the combination of CFRP and steel plate were studied.The results showed that the ultimate load Pu of the strengthened T-beam is over 90%higher than that of the comparison beam.The impact of prestress degree on the ultimate midspan deflection fmax and the ductility factor y is obvious in such a way that the/max reduces about 2 5%when the prestressing force increases 5%.The yield load Py and the ultimate load Pu increase linearly with the increase of the strengthening layers,and decrease linearly w ith the increase of the pre-splitting degree.The Pu of the T-beam strengthened by three-layer CFRP increases 52.8%than that strengthened by one-layer CFRP.When the pre-splitting degree is 6 0%,the fmax reduces about 10%.

关 键 词：钢筋混凝土T梁 预应力CFRP 钢板 复合加固 抗弯性能 

分 类 号：U445.6[建筑科学—桥梁与隧道工程]