Abstract
In order to assess the seismic performance of damaged reinforced concrete (RC) frame strengthened with carbon fiber reinforced polymers (CFRP) sheets, two experimental specimens with identical reinforcement ratio and geometric dimensions were designed following Chinese code for seismic design of buildings. Experimental specimens consist of a reference (undamaged) RC frame, namely, KJ-1, and an earthquake-damaged RC frame strengthened with CFRP sheets, namely, KJ-2. A pseudostatic test was conducted on the two specimens to simulate moderate earthquake damage. The strengthening effects of CFRP sheets on damaged RC frame were discussed in terms of hysteretic curve, skeleton curve, stiffness degradation, and ductility. In addition, numerical method based on fiber model method was utilized to analyze the seismic performance of KJ-1 and KJ-2 and it is compared with the experimental result. Both the results confirm that the method of exterior bonding CFRP sheets on the damaged RC frame has restored the seismic performance such as bearing capacity, stiffness, and ductility to its original undamaged level, and some of the seismic performance of the damaged RC frame strengthened with CFRP sheets is even better than the undamaged one, which proves that the method has significant effect in strengthening postearthquake-damaged RC frames.
Highlights
During Wenchuan Earthquake in 2008 [1, 2], reinforced concrete (RC) frame structures showed good seismic performance on the whole
The experimental results are compared with numerical analysis based on fiber element method using OpenSees software. Both the results prove that the method of exterior bonding Carbon fiber reinforced polymers (CFRP) sheets can effectively improve the seismic performance of damaged RC frame
At elastic-plastic stage, the stiffness of specimen KJ-2 is improved dramatically compared with KJ-1
Summary
During Wenchuan Earthquake in 2008 [1, 2], reinforced concrete (RC) frame structures showed good seismic performance on the whole. Guo et al [24] compare two earthquake-damaged RC frames strengthened by exterior bonded CFRP sheets and combination of both CFRP and steel sheets, respectively, with the original (undamaged) RC frame, while three RC frames have the same reinforcement ratio and geometric dimensions. Their experiment shows that the two strengthening procedures can increase the yield strength, ductility, ultimate displacement, and energy dissipation. The experimental results are compared with numerical analysis based on fiber element method using OpenSees software Both the results prove that the method of exterior bonding CFRP sheets can effectively improve the seismic performance of damaged RC frame
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