Shear Behaviour of Precast Concrete Beam with Hollow Composite Reinforcing Systems

Bone, Cameron (2018) Shear Behaviour of Precast Concrete Beam with Hollow Composite Reinforcing Systems. [USQ Project]


Hollow Core Concrete has been widely utilized in our infrastructure due to the design benefits of a reduced self-weight, and the economic benefits associated with reduced material, production times and cost. Unfortunately, the benefits of hollow core concrete come with a disadvantage of decreased load capacity which poses its own design limitations. The use of Fibre Reinforced Polymers (FRP) in upgrading existing reinforced concrete structures is emerging as one of the most promising technologies in this field. As bonding between concrete and reinforcement is the dominant factor affecting the flexural strengthening and shear behaviour of concrete members, research has predominately focused on various ways to improve the bonding efficiency. Recently, a new innovative Composite Reinforcing System (SR60-05 Hollow Reinforcement Rebar) has been developed, that incorporates a FRP rebar with shear connectors that allow an interlocking of the FRP with the surrounding concrete, which could have great impact on the civil construction industry. This research project observes and analyses the shear behaviour of precast hollow core reinforced concrete beams with hollow composite reinforcing systems (CRS) to determine if it successfully interlocks with the surrounding concrete and increases or otherwise influences the shear behaviour of the concrete beam. Five reinforced concrete beams were constructed and tested with increasing load until failure. S1 beam was a solid concrete control, S2 beam was hollow constructed with a PVC pipe placed inside the steel frame to shape the hollow core, and beams S3, S4 and S5 were constructed with CRS (SR60-05 Hollow Reinforcement Rebar) with each CRS beam differing in width and Ah/At ratio. Results show an increase in shear strength capacity (maximum load) of 57.2 % in hollow core beam with the inclusion of CRS. An increase in ratio of hollow area over total area (Ah/At) is seen to decrease the shear strength capacity of beams, however with the inclusion of the Composite Reinforcing System (CRS), the S4 beam (175mm) with the highest ratio of hollow core to total area, maintained a similar increase in shear strength capacity to the S3 beam (200mm width).

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Manalo, Allan C.; Al-Fakher, Usama
Qualification: Bachelor of Engineering (Honours) (Civil)
Date Deposited: 06 Sep 2022 01:23
Last Modified: 27 Jun 2023 04:49
Uncontrolled Keywords: Hollow Core Concrete; Fibre Reinforced Polymers (FRP); shear behaviour

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