寒冷环境纳米高岭土增强预应力FRP-混凝土梁承载能力研究  

Research on nano kaolin modified epoxy resin enhanced FRP-concrete beam load capacity in cold environment

作　　者：殷雨时[1,2] 范颖芳[2] 吴建鑫 徐广锋 YIN Yushi;FAN Yingfang;WU Jianxin;XU Guangfeng(Liaoning Provincial College of Communications,Shenyang 110122,China;Department of Civil Engineering,Dalian Maritime University,Dalian 116000,China;Beijing Hualian Technology Development Co.,Ltd.,Beijing 100089,China;New Development of Communications Group,Shenyang 110006,China)

机构地区：[1]辽宁省交通高等专科学校,辽宁沈阳110122 [2]大连海事大学土木工程系,辽宁大连116000 [3]北京中交华联科技发展有限公司,北京100089 [4]辽宁新发展交通集团,辽宁沈阳110006

出　　处：《混凝土》2019年第3期53-55,59,共4页Concrete

基　　金：国家自然科学基金项目(51578099);辽宁省自然科学基金项目(20180551197);辽宁省交通高等专科学校技术应用型项目(lnccjyky201701)

摘　　要：基于插层后的纳米高岭土改性环氧树脂胶,并对4根混凝土基准梁、4根预应力CFRP-混凝土梁进行0、50、150、300次冻融循环,通过三点弯曲试验,研究了冻融循环对预应力CFRP-混凝土梁的承载能力的影响。研究结果表明:基于改性的环氧树脂胶的预应力CFRP-混凝土梁可以明显改善CFRP-混凝土界面性能,强化界面黏结应力,开裂荷载、极限荷载分别提高6～12、8～16倍不等;150次冻融循环内,融循环对预应力CFRP-混凝土梁的质量和弹性模量认为变化不大;预应力CFRP-混凝土梁可以明显增强结构整体韧性,减少跨中挠度损失约20%。Based on intercalating about nano kaolin modified epoxy resin,and the four concrete beam and four prestressed CFRP-concrete beams were made,adopting 0,50,150,300 times of freeze-thaw cycles,using three point bending test,the freeze-thaw cycle influence the bearing capacity of the prestressed CFRP-concrete beam was studied.The results show that based on the modification of epoxy resin adhesive the prestressed CFRP-concrete beam can obviously improve the interfacial performance between CFRP and concrete,strengthen the interfacial bond stress,cracking load,ultimate load increase by 6 to 12 times,8 to 16 times respectively.freeze-thaw cycle influences little on the mass and elastic modulus of prestressed CFRP-concrete beam within 150 times cycles,cycle in the quality of CFRP and concrete beam and elastic modulus think little change.Prestressed CFRP-concrete beam can significantly enhance the structural ductility,and reduce the midspan deflection lost about 20%.

关 键 词：预应力 CFRP 冻融循环 三点弯曲 纳米高岭土 界面 

分 类 号：TU528.01[建筑科学—建筑技术科学]