持续荷载作用对GFRP筋-海工混凝土黏结性能的影响  

Effect of sustained load on the bond performance between GFRP bars and marine concrete

作　　者：赵潍越 商怀帅[1] 杨加兴 聂志超 ZHAO Weiyue;SHANG Huaishuai;YANG Jiaxing;NIE Zhichao(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China;Qingdao Sea and Land Communication Engineering Quality Inspection Co.Ltd.,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266525 [2]青岛海陆通工程质量检测有限公司,青岛266033

出　　处：《青岛理工大学学报》2024年第1期19-25,共7页Journal of Qingdao University of Technology

基　　金：国家自然科学基金资助项目(51778310);山东省自然科学基金重大基础研究项目(ZR2022ZD33);滨海城乡建设工程安全与性能提升研究创新团队项目;山东省“双一流”建设工程-土木。

摘　　要：为研究持续荷载作用下GFRP筋与海工混凝土间的黏结性能,设计制作了16个GFRP筋-海工混凝土梁式黏结性能试件,在不同持续荷载等级(0%P_(u),25%P_(u),45%P_(u),65%P_(u))作用下进行了为期120 d的持载试验。对持载过程中GFRP筋-海工混凝土间的瞬时滑移及时变滑移进行了测试分析,并建立不同持载等级作用下的GFRP筋-海工混凝土间时变滑移模型;对比分析了持续荷载作用下GFRP筋与混凝土和普通钢筋与混凝土间的滑移量大小及变化规律。试验结果表明:瞬时滑移量随着持载等级的提高而增大,加载端滑移量大于自由端滑移量;时变滑移量随时间呈非线性增长,前期增长较快,后期滑移量逐渐趋于稳定;两种筋材与混凝土间的时变滑移变化规律相似,但GFRP筋与混凝土间的滑移量要远大于普通钢筋与混凝土间的滑移量。In order to study the bond performance between GFRP bar and marine concrete under sustained load,16 GFRP bar-marine concrete beam specimens were designed and fabricated.The 120-day sustained load test was carried out under different sustained load levels(0%P_(u),25%P_(u),45%P_(u) and 65%P_(u)).The instantaneous slip and time-varying slip between GFRP bar and marine concrete during the loading process were analyzed,and the time-varying slip models under different load levels were established.The size and variation of the slip between GFRP bar and concrete and of the slip between ordinary rebar and concrete under continuous load were compared and analyzed.The test results show that the instantaneous slip increases with the increase of sustained load level,and the slip at the loading end is greater than that at the free end;the time-varying slip increases nonlinearly with time;the slip increases rapidly in the early stage and tends to be stable in the later stage;the laws of change of time-dependent slips between the two reinforcement materials and concrete are similar,but the slip between GFRP bar and concrete is much greater than that between ordinary rebar and concrete.

关 键 词：GFRP筋 海工混凝土 持续荷载 梁式试件 黏结强度 滑移量 

分 类 号：TB332[一般工业技术—材料科学与工程]