Prediction of Creep for a Reinforced Concrete Beam Strengthened with an External Reinforcement System Using the Stepped Isothermal Method

Shakirov, Almaz; Sulejmanov, Alfred

doi:10.1007/978-3-030-80103-8_12

Cited by 1 publication

(1 citation statement)

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“…Therefore, active measures should be taken to strengthen RAC components, improve structural safety and thus expand the application of RAC. Many structural strengthening methods have been developed, such as the external prestress method (Zhao et al, 2019), the outsourcing steel method (Shakirov & Sulejmanov, 2021), and the steel plate bonding method (GB/T 50367-2013(GB/T 50367- , 2013. However, these methods exhibit many defects.…”

Section: Introductionmentioning

confidence: 99%

Study on Crack Resistance and Calculation Model of RAC Beams Strengthened with Prestressed CFRP

Ji,

Sun,

Chen

et al. 2024

Int J Concr Struct Mater

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With the development of recycled aggregate concrete (RAC), the recovery rate of construction waste is improved, and the pollution problem is alleviated. In particular, RAC beams strengthened with prestressed carbon fiber reinforced plastics (CFRP) can exhibit improved mechanical properties, expanding RAC application. Four groups of reinforced RAC beam specimens contained 0%, 40%, 70%, and 100% recycled coarse aggregate, respectively. Each group of beams was first pre-cracked and then strengthened by prestressed CFRP with one layer and two layers respectively. Finally, the bearing capacity tests were performed for these beams. The test results show that as the recycled coarse aggregate content increases, the cracking moment and ultimate load capacity of the beam decrease, while its crack width increases. As the CFRP layer increases, the deformation and crack width of the beam decreases, while the number of cracks increases. The prestressed CFRP also exhibited tensile and peeling failure. A beam deflection calculation model was established by introducing a coefficient k representing the interaction between recycled aggregate and CFRP. The influence coefficient of concrete elongation on the crack width and average crack spacing of the beam was modified, and the crack width analysis model of the beam was established. The calculated results are in good agreement with the experimental observations. It can provide reference for the application and design of recycled concrete beams strengthened with prestressed CFRP.

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Section: Introductionmentioning

confidence: 99%