GFRP带肋筋粘结性能试验研究  

EXPERIMENTAL STUDY ON BOND BEHAVIOR OF GFRP RIBBED REBARS

作　　者：郝庆多[1] 王言磊[1] 侯吉林[1] 欧进萍[1,2] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090 [2]大连理工大学土木水利学院,大连116024

出　　处：《工程力学》2008年第10期158-165,179,共9页Engineering Mechanics

基　　金：交通部西部交通建设科技项目(200431882021);国家杰出青年基金项目(50525823)

摘　　要：利用拉拔试验,研究玻璃纤维增强塑料(GFRP)带肋筋与混凝土的粘结性能,确定GFRP带肋筋的最佳外形,构建GFRP带肋筋与混凝土的粘结滑移本构关系模型。试验变量包括筋直径、肋间距和肋高度。试验结果表明:GFRP带肋筋与混凝土的粘结强度显著提高;粘结强度随GFRP带肋筋直径的增大而降低;试件的破坏形式为GFRP带肋筋肋间混凝土的剪切破坏,以及肋表面的轻微磨损;不同的肋参数,如肋间距、肋高度等,对GFRP带肋筋与混凝土的粘结性能影响显著。通过对试验数据的分析可得,机械咬合力是GFRP带肋筋与混凝土的粘结强度的主要组成部分;剪切滞后现象反映了直径对GFRP筋粘结性能的影响;楔块效应反映了肋参数对GFRP筋粘结性能的影响;GFRP带肋筋的最佳肋间距为筋直径的1倍,最佳肋高度为筋直径的6%,此结果可为GFRP带肋筋的规模化生产及工程应用提供理论依据;新构建的粘结滑移本构关系模型能较好地反映GFRP带肋筋的受力全过程。In this research, pull-out test was used to study the bond between GFRP ribbed rebar and concrete, aiming to determine the optimal surface configuration of GFRP ribbed rebar, and to build the bond-slip constitutive model of GFRP ribbed rebar to concrete. The testing variables includes the rebar diameter, rib spacing and rib height. The test results show that the bond strength of GFRP ribbed rebar is improved obviously, which decrease with the increase of the rebar diameter. The failure mode is the shear of the concrete between the ribs of the rebar, and the slight damage of the rib surface. The bond behavior of these rebars varied with the rib geometries, such as the rebar rib spacing and the rib height. Theoretical analysis of the test results indicate that the bond strength depended primarily on mechanical interaction between the ribs of the rebar and the surrounding concrete. The effect of rebar diameter on bond behavior can be attributed to the shear lag of GFRP ribbed rebar. And the variation in bond behavior of GFRP ribbed rebar with different rib parameters can be ascribed to the wedge effect. Design recommendations are drawn from the results that the optimal rib spacing is of the rebar＇s diameter, and the optimal rib height is 6% of the diameter. The newly built bond-slip constitutive model fits the whole loading process of GFRP ribbed rebar well.

关 键 词：GFRP带肋筋 拉拔试验 粘结性能 剪切滞后 粘结-滑移模型 

分 类 号：TU599[建筑科学—建筑技术科学] TB332[一般工业技术—材料科学与工程]