Rehabilitation of Timber Bridge Piles with Splitting Failure Mechanism

Borzou, Rahmin (2017) Rehabilitation of Timber Bridge Piles with Splitting Failure Mechanism. [USQ Project]

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Fibre composites such a Fibre Reinforced Polymer (FRP) laminates inherent properties that can be seen to offer great tensile strength benefits than that of steel, timber and concrete in vast varieties of environmental conditions. These conditions can range from tidal/splash waves, high moisture environments and fluctuating thermal conditions. The combination of FRP laminate with an infill annulus material offers deteriorated timber sections greater axial and lateral confinement, resulting in larger axial load capacities. Not only does the FRP laminate offer high tensile strength, but also offers a protection from biological attack for submerged timber pile cases.

This research project, focuses on a repair method for decayed timber piles, for bridges, boardwalks and jetties using FRP jacketing technology. Due to durability, pumpability, workability and compressive strength requirements, Crane Rail Grout (CRG) (new product) and Underwater Cementitious Grout (UCG) development was preferred. The combination of material offers an all-round (360 degree) confining pressure. This significantly increases the strength of the pile. Therefore, this repair method will be tested and validated throughout this paper.

Several objectives were considered to examine the maximum load capacities using the novel repair timber pile rehabilitation technique. The first is the comparison of several defects of FRP laminate wrapped timber pile sample with two types of infill material. This will be compared to a normalised defected timber pile section with no repair method. The defect levels follow the split depth method. Critical depth is the radius of the timber section. 2/3 radius and 1/3 radius defects will also be validated against unwrapped control samples.

The second object, testing and analysing results to confirm the repair method technique. Linear deformation was achieved for all rehabilitated samples without the samples deforming. Meaning no failure was achieved. Lateral confinement had a reduction of approximately 66 % to that of the unwrapped samples. This result validated the objectives and expected outcomes of lateral confinement enhancements. Lateral confinement was seen to have the greatest impact on the unwrapped samples, resulting in failure at relatively low strain values. Lower axial strain improvements, obtained through infill material strength properties.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours) (Civil)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Lokuge, Weena
Date Deposited: 06 Sep 2022 23:45
Last Modified: 06 Sep 2022 23:45
Uncontrolled Keywords: Fibre Reinforced Polymer (FRP); repair method

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