| Title |
Bond Stress-Slip Model between FRP Sheet and Concrete under Cyclic Load |
| Keywords |
Fiber-reinforced Polymer Sheet ; Bond Stress ; Slip ; Concrete ; Cyclic Load |
| Abstract |
Fiber-reinforced polymer(FRP) sheets have been successfully used to retrofit a number of existing concrete buildings and structures because of the FRP sheets' excellent properties (strength, lightness and durability). One of the most promising uses of FRP is strengthening concrete buildings that have been damaged by earthquakes or have insufficient bearing capacity by the external application of FRP sheets. Bond characteristics between FRP sheets and concrete should be verified to be an effective retrofitting system. In this study, eighteen specimens were subjected to cyclic bond tests to obtain the bond stress-slip relationships of FRP-concrete interface. The tests were conducted using two experimental variables: (1) type of FRP (aramid, carbon, and polyacetal), (2) sheet layers (single-layered and double-layered). The bond stress-slip model under cyclic load was developed on a Popovics base envelope and was verified through numerical analysis. Finally, it was known that numerical analysis using the model compared well overall to the experimental cyclic responses. |