Steel and Composite Structures

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Stress intensity factors for double-edged cracked steel beams strengthened with CFRP plates

  • Wang, Hai-Tao (College of Civil and Transportation Engineering, Hohai University) ;
  • Wu, Gang (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University) ;
  • Pan, Yu-Yang (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University) ;
  • Zakari, Habeeb M. (College of Civil and Transportation Engineering, Hohai University)
  • Received : 2018.08.20
  • Accepted : 2019.11.11
  • Published : 2019.12.10
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Abstract

This paper presents a theoretical and finite element (FE) study on the stress intensity factors of double-edged cracked steel beams strengthened with carbon fiber reinforced polymer (CFRP) plates. By simplifying the tension flange of the steel beam using a steel plate in tension, the solutions obtained for the stress intensity factors of the double-edged cracked steel plate strengthened with CFRP plates were used to evaluate those of the steel beam specimens. The correction factor α1 was modified based on the transformed section method, and an additional correction factor φ was introduced into the expressions. Three-dimensional FE modeling was conducted to calculate the stress intensity factors. Numerous combinations of the specimen geometry, crack length, CFRP thickness and Young's modulus, adhesive thickness and shear modulus were analyzed. The numerical results were used to investigate the variations in the stress intensity factor and the additional correction factor φ. The proposed expressions are a function of applied stress, crack length, the ratio between the crack length and half the width of the tension flange, the stiffness ratio between the CFRP plate and tension flange, adhesive shear modulus and thickness. Finally, the proposed expressions were verified by comparing the theoretical and numerical results.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Jiangsu Natural Science Foundation, China Postdoctoral Science Foundation, Central Universities

The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (51708174), Jiangsu Natural Science Foundation (BK20170889), Project Funded by China Postdoctoral Science Foundation (2019M651675), and the Fundamental Research Funds for the Central Universities (2017B00714).

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