Stressing State Analysis of Reinforced Concrete Beam Strengthened by CFRP Sheet with Anchoring Device

Materials

卷:14

Jie Lai¹  Maoguo Yuan²  Jie Huang³  Guorui Sun³  Jun Shi⁴  Liang Luo⁴ 

[1] Academy of Combat Support, Rocket Force University of Engineering, Xi’an 710025, China;

[2] Engineering Construction Limited Liability Company of Yi’nan County, Linyi 276300, China;

[3] Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;

[4] School of Civil Engineering, Central South University, Changsha 410075, China;

关键词: stressing state;    failure load;    middle anchorage;    end anchorage;    reinforcement concrete beam;   

DOI  :  10.3390/ma14030576

来源: DOAJ

【 摘 要 】

This paper investigates the working performance of reinforcement concrete (RC) beams strengthened by Carbon-Fiber-Reinforced Plastic (CFRP) with different anchoring under bending moment, based on the structural stressing state theory. The measured strain values of concrete and Carbon-Fiber-Reinforced Plastic (CFRP) sheet are modeled as generalized strain energy density (GSED), to characterize the RC beams’ stressing state. Then the Mann–Kendall (M–K) criterion is applied to distinguish the characteristic loads of structural stressing state from the curve, updating the definition of structural failure load. In addition, for tested specimens with middle anchorage and end anchorage, the torsion applied on the anchoring device and the deformation width of anchoring device are respectively set parameters to analyze their effects on the reinforcement performance of CFRP sheet through comparing the strain distribution pattern of CFRP. Finally, in order to further explore the strain distribution of the cross-section and analyze the stressing-state characteristics of the RC beam, the numerical shape function (NSF) method is proposed to reasonably expand the limited strain data. The research results provide a new angle of view to conduct structural analysis and a reference to the improvement of reinforcement effect of CFRP.

【 授权许可】

Unknown