预应力CFRP与钢板加固T形梁抗弯荷载、刚度及裂缝分析  

Analysis on Anti-bending Load,Rigidity and Crack of Prestressed CFRP and Steel Plate Reinforced T-shape Beam

作　　者：朱广山 朱浮声[1] 盛国华 马作鑫 ZHU Guangshan;ZHU Fusheng;SHENG Guohua;MA Zuoxin(School of Resources&Civil Engineering,Northeastern University,Shenyang,China,110819;School of Transportation Engineering,Shenyang Jianzhu University,Shenyang,China,110168;School of Architecture and Civil Engineering,Shenyang University of Technology,Shenyang,China,110870)

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：《沈阳建筑大学学报（自然科学版）》2018年第2期211-221,共11页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51478276);辽宁省教育厅基金项目(20156406)

摘　　要：目的为获得T形梁复合加固效果及不同加固参数对承载力、刚度及裂缝的影响规律.方法对10根混凝土试件进行抗弯性能试验,对比分析荷载-挠度及荷载-裂缝条数关系.结果复合加固T形梁开裂荷载Pcr、屈服荷载Py、极限荷载Pu达到对比梁的242.1%,182.5%和196.8%.Pcr、Py随着预应力提高而增加,Pu略降低;随CFRP层数增加,Pcr、Py与Pu呈线性增长;预裂梁Py与Pu达到对比梁150%以上.预应力10%~15%时,加固2层的屈服后刚度比1层提高近1倍.复合加固裂缝最少,随层数增加,最大裂缝宽度随荷载增大而减小.结论复合加固对荷载及屈服后刚度影响明显,并有阻裂效果,可显著提高T形梁的抗弯性能.The goal of the paper is to obtain the influence rule of composite reinforcement effect and different reinforcement parameters of T-shape beam on bearing capacity,rigidity and crack.The test on anti-bending performance of 10 pieces of concrete test pieces was done to compare and analyze the relationship between load-deflection and load-number of cracks.The results show that,cracking load P cr,yield load P y,and ultimate load P u of composite reinforcement T-shape beam reached 242.1%,182.5%and 196.8%of the compared beam.P cr and P y increase with the increase of prestress,and P u decreases slightly;With the increase of CFRP layer,P cr,P y,and P u show the linear growth trend;P y and P u of precracked beam reached over 150%of the compared beam.When the prestress increases in 10%~15%,the rigidity of reinforced two-layer after the yield increases nearly one time than that of one-layer.The number of crack generated by composite reinforcement is the least.With the increase of layer,the maximum crack width decreases as the increase of load.We can conclude that,the influence of composite reinforcement on load and rigidity after the yield is obvious,with anti-cracking effect,which can remarkably improve the anti-bending performance of T-shape beam.

关 键 词：T形梁 预应力CFRP 复合加固 抗弯荷载 抗弯刚度 裂缝 

分 类 号：TU375.1[建筑科学—结构工程]