Double pull specimen more suitable for measuring bond-slip relationship of FRP-to-concrete interface  

作　　者：杨奇飞 陆小华 熊光晶 

机构地区：[1]Department of Civil Engineering,Shantou University

出　　处：《Journal of Central South University》2010年第2期400-405,共6页中南大学学报（英文版）

基　　金：Project(2006BAJ03A07) supported by the National Key Technologies R & D Program of China;Project(5008283) supported by the Natural Science Foundation of Guangdong Province, China

摘　　要：A new "conceptual" design named "double pull" specimen was proposed in order to measure the bond-slip(δ-τ) relationship of fiber reinforced polymer(FRP)-to-concrete interface more accurately.A finite element analysis(FEA) was performed for preliminarily evaluating the suitability of the proposed conceptual double pull specimen.Through the FEA,it was indicated that the FRP-to-concrete interface of the proposed conceptual specimen might subject to a much higher load level than that of the most commonly used simple shear specimen,showing a great potential for measuring δ-τ relationship more accurately.In the light of the conceptual specimen,a kind of "practical" double pull specimen was developed and proved to be more suitable for measuring δ-τ relationship through an exploratory experimental study with 20 specimens.Consequently,an experimental program with 10 double pull specimens was performed for measuring the ultimate slip δu which was difficult to capture by using the existing specimens.It is shown that the range of δu is 0.31-0.52 mm based on the test results.The suggestion for improving the measure method is also put forward.A new ＂conceptual＂ design named ＂double pull＂ specimen was proposed in order to measure the bond-slip （δ-τ） relationship of fiber reinforced polymer （FRP）-to-concrete interface more accurately. A finite element analysis （FEA） was performed for preliminarily evaluating the suitability of the proposed conceptual double pull specimen. Through the FEA, it was indicated that the FRP-to-concrete interface of the proposed conceptual specimen might subject to a much higher load level than that of the most commonly used simple shear specimen, showing a great potential for measuring δ-τ relationship more accurately. In the light of the conceptual specimen, a kind of ＂practical＂ double pull specimen was developed and proved to be more suitable for measuring δ-τ relationship through an exploratory experimental study with 20 specimens. Consequently, an experimental program with 10 double pull specimens was performed for measuring the ultimate slip δu which was difficult to capture by using the existing specimens. It is shown that the range of δu is 0.31-0.52 mm based on the test results. The suggestion for improving the measure method is also put forward.

关 键 词：fiber reinforced polymer （FRP） concrete BOND-SLIP ultimate slip double pull specimen EXTENSOMETER 

分 类 号：TU398.9[建筑科学—结构工程]