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A platform for research: civil engineering, architecture and urbanism
Experimental study on notched concrete beams with externally-bonded CFRP under repeated environmental treatments
Highlights A novel environmental effects in terms of heating, freezing, and humidity. The bond behaviors under temperature elevation and repeated environmental effects. Analysis and determination of interfacial shear traction stress and separation. Numerical simulation under temperature elevation and repeated environmental effects.
Abstract This paper investigated the influences of the temperature elevation and the repeated environmental effects on the bond behavior of the notched concrete beams with CFRP externally bonded through four-point bending tests. The corresponding numerical model was established and the FE results were compared with the test results. Two failure modes were observed in the test, both of which occurred to be sudden and brittle. The failure mode of the specimens changed from concrete failure to CFRP debonding after the temperature exceeded 150 °C or the cycle number reached 50 times. The ultimate loads of the specimens decreased linearly with the increase of both the temperature and the cyclic number, and the slopes of load-displacement curves in the first phase of the specimens were also reduced by both heating and cycling. Before CFRP debonding, the average maximum interfacial shear stresses at 0–30 mm from the mid-span decreased linearly with the increase of both the temperature and the cyclic number. The average shear traction stresses and the average interface stiffnesses were decreased with the increase of both the temperature and the cyclic number. The results obtained from the FE were similar to that from the test, which confirms the suitability of the FE model in the test conditions.
Experimental study on notched concrete beams with externally-bonded CFRP under repeated environmental treatments
Highlights A novel environmental effects in terms of heating, freezing, and humidity. The bond behaviors under temperature elevation and repeated environmental effects. Analysis and determination of interfacial shear traction stress and separation. Numerical simulation under temperature elevation and repeated environmental effects.
Abstract This paper investigated the influences of the temperature elevation and the repeated environmental effects on the bond behavior of the notched concrete beams with CFRP externally bonded through four-point bending tests. The corresponding numerical model was established and the FE results were compared with the test results. Two failure modes were observed in the test, both of which occurred to be sudden and brittle. The failure mode of the specimens changed from concrete failure to CFRP debonding after the temperature exceeded 150 °C or the cycle number reached 50 times. The ultimate loads of the specimens decreased linearly with the increase of both the temperature and the cyclic number, and the slopes of load-displacement curves in the first phase of the specimens were also reduced by both heating and cycling. Before CFRP debonding, the average maximum interfacial shear stresses at 0–30 mm from the mid-span decreased linearly with the increase of both the temperature and the cyclic number. The average shear traction stresses and the average interface stiffnesses were decreased with the increase of both the temperature and the cyclic number. The results obtained from the FE were similar to that from the test, which confirms the suitability of the FE model in the test conditions.
Experimental study on notched concrete beams with externally-bonded CFRP under repeated environmental treatments
Zhang, Yaosheng (author) / Wang, Lianguang (author) / Gao, Haiyang (author)
2022-07-05
Article (Journal)
Electronic Resource
English
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