Electronic Thesis and Dissertation Repository

Thesis Format

Integrated Article

Degree

Master of Engineering Science

Program

Civil and Environmental Engineering

Supervisor

Nehdi, Moncef

Abstract

Reinforced concrete pipe (RCP) with single elliptical (SE) reinforcement offers cost savings and is permitted by Canadian and American standards. Yet, its use has not yet gained momentum primarily due to limited knowledge of its structural performance. This study explores the structural behaviour of full-scale 1050 mm and 1200 mm diameter RCP reinforced with SE cold drawn steel wire cage under the Three-Edge Bearing Test. Results indicate that RCP with SE reinforcement designed per current standards did not meet the specified 0.3-mm crack and ultimate load capacity. Hence, pertinent provisions in CSA A257.2 and ASTM C76 for RCP need to be updated with specific and more suitable guidance for SE cage RCP. The study also investigates the effect of the SE cage rotation on the structural capacity of the pipe through finite element modelling. The model indicates a significant reduction in ultimate load capacity from the cage rotation.

Summary for Lay Audience

Concrete is the second most consumed material in the world today, second only to water. Concrete used in construction applications is typically reinforced with a steel mesh or cage in order to increase its strength and resistance to cracking. The wet concrete is poured on the steel mesh/cage in a mould, permanently encasing the steel once dried up. Reinforced concrete pipes (RCPs) has been reliably used in North America for over a century to transport sanitary and storm sewage. As such, they are an important and durable component of modern civil infrastructure. RCP market share has seen a steady decline over the years due to competition from the plastic pipe industry and lack of technological advancements. The most common reinforcement configuration used in the industry is the double circular (DC) steel cage configuration for mid-size diameter pipes. RCP with single elliptical (SE) steel cage reinforcement offers cost savings up to 30% and is permitted by Canadian and American RCP design standards as an alternative to the DC steel cage. Yet, its use has not gained momentum, primarily due to limited knowledge of its practical application in the industry. This study explores the practical application of full-scale 1050 mm and 1200 mm diameter RCP with SE steel cage under a standard load test. Results indicate that RCP with SE steel cage designed according to current Canadian and American standards did not meet the specified load limits. Hence, relevant requirements in design standards for RCP need to be updated with specific and more suitable guidelines for SE cage RCP design. The study also investigates the effect of rotation of the SE cage on the load capacity of the pipe through computer modelling programs. The computer models indicate significant reduction in the pipe load capacity due to the rotation of the cage from its original position.

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