REN Yunyue,LIU Wen,FENG Peng,et al.Influence of crack-height ratio on tensile softening relationship of pultruded FRP[J].,2016,(02):055-62.





Influence of crack-height ratio on tensile softening relationship of pultruded FRP
任贇跃1 刘问1 冯鹏2 王艳晗1 罗璐1 郑毅2
1. 北京林业大学 土木工程系, 北京100083;
2. 清华大学 土木工程系, 北京100084
REN Yunyue1 LIU Wen1 FENG Peng2 WANG Yanhan1 LUO Lu1 ZHENG Yi2
1. Department of Civil Engineering, Beijing Forestry University, Beijing 100083, China;
2. Department of Civil Engineering, Tsinghua University, Beijing 100084, China
structural engineeringtensile softening modelexperiment researchpultruded FRPcrack height ratio
In order to study the tensile softening property of pultruded FRP,a threepoint fracture test on single notched specimens was taken out along the fiber direction notch. The initial crack height ratioswere set as 0.2, 0.3, 0.4 and 0.5. The load-deflection (P-δ)curve, the load-crack mouth opening displacement (P-CMOD)curve, and the load-crack tip opening displacement(P-CTOD) curve were measured and recorded during the test.The result shows that, a quasi-brittle fracture phenomenon is obvious for pultruded FRP, which includes three stages:linear stage, stable stage and failure stage. According to the P-δ curve, the fracture energiesof tested specimen arecalculated to obtain bilinear tensile softeningcurve.The fracture energy is composed of two parts, cracking fracture energy and fiber bridging fracture energy.It shows that the crack-height ratio has little effect on the fracture energy,and the cracking fracture energy takes about 60% of the total fracture energy.The tensile softening model is obviously influenced by the initial crack height ratio, while the function formula between model parameters and crack height ratio is built.


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更新日期/Last Update: 1900-01-01