Simulating Intermediate Crack Debonding on RC Beams Strengthened with Hybrid Methods

Shukri, Ahmad Azim and Shamsudin, Mohd Fazaulnizam and Ibrahim, Zainah and Alengaram, Ubagaram Johnson and Hashim, Huzaifa (2018) Simulating Intermediate Crack Debonding on RC Beams Strengthened with Hybrid Methods. Latin American Journal of Solids and Structures, 15 (9). e78. ISSN 1679-7817, DOI

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The externally bonded (EB) and the near-surface mounted (NSM) are two well-known methods for strengthening reinforced concrete (RC) beams. Both methods are unfortunately prone to fail prematurely through debonding when the amount of strengthening reinforcement provided is high. In response to this, a hybrid method that combines the EB and NSM method was introduced. The method allows the amount of reinforcement needed for EB and NSM methods to be reduced; this, in theory, should lower the interfacial stresses, thus reducing the possibility of debonding failures. While debonding failure can be prevented, certain amounts of debonding would still occur through the interfacial crack (IC) debonding mechanism which can affect the strength and stiffness of hybrid strengthened beams even if it does not directly cause failure. This paper presents a method to simulate IC debonding of hybrid strengthened beams using the moment-rotation approach. The proposed method allows a better prediction of maximum load and stiffness of the beams. The method is also less dependent on empirical formulations compared to the commonly used moment-curvature approach; this allows the method to be applicable to all material and shape of hybrid strengthening reinforcement, assuming correct material models are used. The proposed method was then used to perform parametric studies; among the important findings is the length of IC debonding tend to increase when FRP sheet with higher elastic modulus is used, thus negating most of the benefit from the higher modulus.

Item Type: Article
Funders: University of Malaya, Grand Challenge - SUS (Sustainability Science) Grant, project number GC003A-15SUS
Uncontrolled Keywords: Externally bonded; fibre reinforced polymers; near-surface mounted; numerical analysis; partial-interaction; reinforced concrete
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 13 Mar 2019 01:11
Last Modified: 13 Mar 2019 01:11

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