分布式OFBG-GFRP传感筋在粘结性能试验中的应用  

Application of distribution OFBG-GFRP rod sensor in bond test

作　　者：何政[1] 卢富永 周智[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]中国纺织工业设计研究院,北京100037

出　　处：《功能材料》2006年第9期1455-1458,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50208007)

摘　　要：提出了一种新的利用分布式OFBG-GFRP智能传感筋研究GFRP筋与混凝土之间粘结特性的方法。在OFBG-GFRP的拉挤过程中,多个串连的光栅随同母材,即GFRP筋一同拉挤成型。早期的性能试验表明OFBG-GFRP筋不仅可以作为优良的增强材料使用,还具有理想的和稳定的传感特性。对3个带有OFBG-GFRP筋的混凝土粘结试件进行了直接拔出试验,在试验中自动记录了3个试件中的14个光栅的波长变化数据,这些数据连同记录的拔出力水平一起用来研究GFRP筋与混凝土之间的粘结性能。分析结果表明,GFRP筋与混凝土之间的粘结应变沿埋置深度基本呈现倒三角分布,且随着拔出力的增大,粘结应变分布也发生较为明显的变化,记录的光栅数据也很好地印证了试验过程中发生的试验现象。试验表明,所提方法可以在不影响FRP筋与混凝土之间粘结性能的情况下展开研究。A new method was put forward to investigate the bond behavior between glass fiber reinforced polymer （GFRP） rods and concrete by using smart distribution optical fiber Bragg grating-GFRP （OFBC-GFRP） rod sensor. During the manufacturing process of OFBG-FRP rod,optical fiber Bragg gratings were pultruded in series along with host materials, i. e. FRP rod. The performance test conducted early has demonstrated that OFBC-GFRP rod has shown desirable and stable smart properties for sensing as well as excellent reinforcement. The direct pull-out test has been carried out on three concrete specimens with OFBG-GFRP rods. The recorded data of changes of wave length from 14 bragg gratings have been used to determine the bond behavior of GFRP rod to concrete,together with the recorded load levels. The analytical results have revealed that bond strains are approximately triangularly distributed along the embedded depth and changed significantly with increasing load levels. The data from OBFG have accounted very well for the phenomena happened during entire testing process. This proposed method is proved to be efficient without any disturbance on the interaction between concrete and FRP rod.

关 键 词：FRP筋 粘结 混凝土 BRAGG光栅 光纤 

分 类 号：TU528[建筑科学—建筑技术科学]