Minoru WAKUI

Experimental study on peeling property of CFRP bonded to steel pletes

Masatugu NAGAI

For the repair of corroded steel members, the adoption of CFRP (Carbon Fiber Reinforced Polymer) with light weight, high elasticity, high strength and high durability has been drawn attention and has been increasing. In the design of CFRP bonding, one of issues to be resolved is to identify peeling behavior and strength of CFRP. In order to clarify the peeling characteristics of CFRP bonded to steel plates, in this study, the experimental study was carried out. High-elasticity type CFRP and newly developed ¡ÈStrand Sheet¡É were bonded to steel flanges in rolled-H beams, which are subjected to pure bending. The chosen parameters are the number of layer of CFRP, which corresponds to load share rate (­ùP/P) of CFRP and length of CFRP bonding. Where, P is the force produced in steel plate without CFRP and ­ùP is that transferred to CFRP. The followings are main results obtained from this study.
1) In case that the damaged part is short in the member axis direction, the bonding length at least 100 millimeters at both outside of damaged area has to be ensured.
2) In several models, the observed strain in CFRP suggested the local peeling. However, the global peeling of CFRP was not observed in all models tested.
3) Even though the minimum strain observed at local peeling was around 1,100¦Ì, from a viewpoint of global peeling, it was prevented at the strain level of 1,500¦Ì(300MPa), which is the maximum stain applied in the test and is 90% of yield strain (¦Åy) of the steel plate.
4) It was confirmed that newly developed ¡Èstrand sheet¡É gave higher performance on peeling behavior compared to that of CFRP




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