Hybrid strengthening of RC beams with externally bonded carbon fiber reinforced polymer laminate and engineered cementitious composites transition layer

Author:

Su Yanli12ORCID,Wu Chang12,Wang Guolin3,Shang Jiaqi4,Zhang Pu5ORCID

Affiliation:

1. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing, China

2. School of Civil Engineering, Southeast University, Nanjing, China

3. School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai, China

4. College of Civil Engineering, Tongji University, Shanghai, China

5. School of Civil Engineering, Zhengzhou University, Zhengzhou, China

Abstract

This paper presents the experimental study on the reinforced concrete (RC) beam strengthened with externally bonded carbon fiber reinforced polymer (EB-CFRP) laminate and engineered cementitious composites (ECC) material. A total of six beams were tested under the four-point bending test to investigate the influence of strengthening scheme, type of CFRP laminate and the width of CFRP plate on the flexural response. The results revealed that hybrid strengthened beam with the technical of EB-CFRP and ECC transition layer significantly enhanced the crack load (29.0%–133.3%), yield load (50.9%–96.5%) and ultimate load (50.0%–81.9%) of the beams relative to the control beam. The employment of ECC material was an ideal transition layer for delaying the interfacial debonding of CFRP laminate, where the ultimate tensile strain of CFRP plate in hybrid strengthened beams was 13.2%–33.33% higher than that of beam merely strengthened with EB-CFRP plate. Beams strengthened with CFRP sheet had the greater flexural performance and higher utilization of CFRP than its counterparts strengthened with CFRP plate. Moreover, the predicted model associated with ultimate bearing capacity of the hybrid beams was provided based on ACI 440.2R-08, which was relatively conservative with a margin for the ultimate load of the hybrid strengthened beams.

Funder

Natural Science Foundation of Shanghai Municipality

Postgraduate Research & Practice Innovation Program of Jiangsu Province

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

Publisher

SAGE Publications

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