变幅反复加卸载下玻璃纤维复合筋与混凝土黏结性能  

BOND BEHAVIOR BETWEEN GFRP BARS AND CONCRETE UNDER VARIABLE RANGE CYCLIC LOADING AND UNLOADING

作　　者：金清平[1] 陈培霞 梁廷英 汪光波 JIN Qingping;CHEN Peixia;LIANG Tingying;WANG Guangbo(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430060,China)

机构地区：[1]武汉科技大学城市建设学院,武汉430060

出　　处：《工业建筑》2019年第3期12-17,23,共7页Industrial Construction

基　　金：国家自然科学基金项目(51278391)

摘　　要：对直径20 mm的玻璃纤维增强聚合物(GFRP)进行单调加载以及两种不同变幅反复加卸载拉拔试验,研究单调静载与变幅反复加卸载作用下GFRP筋与混凝土之间的黏结-滑移关系,加载端滑移量的变化,得到了变幅反复作用对黏结性能的影响规律,并对试验数据与BPE模型上升段曲线进行了拟合分析。结果表明:GFRP筋与混凝土极限黏结强度在反复拉拔荷载作用下会降低,反复加载值越大,降低越多;当拉拔荷载在一定范围时,变幅反复加卸载对黏结强度影响不显著,但均会有残余变形,黏结刚度较单调加载刚度最大可提高1. 76倍;变幅反复加卸载试验全过程黏结滑移曲线与单调加载的曲线不同,但在大于前期荷载时上升段规律与单调加载一致,并与BPE模型上升段曲线较吻合。Pull-out tests were carried out for glass fiber reinforced polymer ( GFRP ) bars with 16 mm diameter by monotonic loading and two different variable range cyclic loadings, so as to study the changes of bond-slip relation and the slip of the loading end. The effect law of bond property under variable range loading was obtained, the test data were compared with the curve data of ascending stage of BPE model. The results showed that bond strength of GFRP bars and concrete decreased under variable range drawing loading, the greater the load value, the more the ultimate bond strength decreased;when the drawing load was within a certain bond force, the effect of variable range cyclic loading and unloading on bond strength was not obvious, but residual deformation happened at all stages, and bond stiffness increased 1. 76 times higher than monotonic loading5 s;the bond-slip curve of variable range cyclic loading and unloading was different from monotonic loading * s, but the law of ascending stage was consistent with monotonous loading when the loading was larger than previous load , and it was in good agreement with the curve of BPE model.

关 键 词：GFRP筋 变幅反复荷载 黏结性能 黏结滑移曲线 力学模型 

分 类 号：TU528.572[建筑科学—建筑技术科学]