高强钢绞线网——聚合物砂浆加固混凝土及预应力混凝土梁的抗弯性能试验研究  

EXPERIMENT STUDY ON FLEXURAL BEHAVIOR OF RC/PRC BEAMS STRENGTHENED WITH HIGH STRENGTH STEEL WIRE MESH AND PERMEABLE POLYMER MORTAR

作　　者：林于东[1] 宗周红[2] 林秋峰[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]东南大学土木工程学院,江苏南京210096

出　　处：《工程力学》2012年第9期141-149,共9页Engineering Mechanics

基　　金：科技部十二五科技支撑计划项目(2011BAK02B03);福建省节约型交通科技发展项目(FIJTKJ2009-18)

摘　　要：该文侧重研究了采用高强钢绞线网——聚合物砂浆加固技术三面加固普通钢筋混凝土(RC)梁和预应力混凝土(PRC)梁的抗弯性能。进行了6片RC梁及5片PRC梁的抗弯静载试验,探讨了不同初始损伤程度、有效预应力大小和加载方式等对高强钢绞线网——渗透性聚合物砂浆加固梁的抗弯性能影响。结果表明:采用高强钢绞线网——聚合物砂浆加固技术加固RC/PRC梁能够有效抑制裂缝的开展,能有效地提高RC/PRC加固梁的抗弯承载能力和抗弯刚度;重复加载会导致加固梁刚度一定程度的退化,初始损伤程度大小不会显著改变加固后RC/PRC梁的抗弯承载力;该文研究对于大量既有RC/PRC梁的抗弯加固具有一定的参考价值。In this paper, the flexural performance of the concrete beams strengthened with U-shaped high strength steel wire and permeable polymer mortar （HSSW-PPM） were studied. An experimental study including six reinforced concrete （RC） beams and five prestressed reinforced concrete （PRC） beams strengthened with HSSW-PPM was carried out under static loading. The infuences of damage intensity, level of effective prestressing and loading regime on the flexural performance of these strengthened beams were investigated. Some conclusions were extracted from the testing as follows： （1） The cracking development can be effectively restrained using the proposed U-shaped strengthening method with HSSW-PPM, and the flexural load-carrying capacity, the rigidity, and the ductility of the strengthened RC/PRC beams can also be enhanced. （2） The rating of rigidity of the strengthened beams might be occurred under a recycle loading, and the flexural carrying capacity of the strengthened RC/PRC beams can not be obviously changed while the initial damage degree changed. This kind of study may be employed as the reference of flexural strengthening for the amount of existing RC/PRC beam structures.

关 键 词：混凝土及预应力混凝土梁 高强钢绞线网——聚合物砂浆加固 U型加固 初始损伤 抗弯试验研究 

分 类 号：TU375.1[建筑科学—结构工程] TU376