Abstract
Prestressed concrete cylinder pipe (PCCP) has been widely used for water transfer and transit projects. However, prestressing wire breaks may result in the rupture of pipes and cause catastrophes. Carbon fiber reinforced polymer (CFRP) liners adhered to the inner concrete core can provide an effective method of internal repair and strengthening of PCCP. To evaluate the rehabilitation effect of CFRP-lined PCCP under combined loads, two contrasting three-dimensional finite element models that investigated the visual cracking of concrete and the yielding of steel cylinders were developed. A conceptual zone was introduced to analyze the different states of the pipe during the phase of wire break. In particular, the complex CFRP-concrete bonded interface was simulated by a cohesive element layer with a bilinear traction-separation response. The results show that CFRP has a good rehabilitation effect on the inner concrete core and steel cylinder but only a slight effect on the outer concrete core, prestressing wire, or mortar. A one-hoop CFRP layer diminishes the area of a yielding steel cylinder of 4.72 m2. In addition, CFRP works more effectively along with an increase in the number of broken wires. This research can provide a basis for strengthening distressed PCCP pipelines.
Highlights
Prestressed concrete cylinder pipe (PCCP) has been widely used in many areas including municipal, industrial, and water diversion because of its structural advantages such as a large diameter, low water head loss, and strong earthquake resistance
The greater the distance from the component to the Carbon fiber reinforced polymer (CFRP), the worse the rehabilitation effect provided by CFRP
A conceptual zone was introduced to analyze the structural performance of all components in different zones
Summary
Prestressed concrete cylinder pipe (PCCP) has been widely used in many areas including municipal, industrial, and water diversion because of its structural advantages such as a large diameter, low water head loss, and strong earthquake resistance. PCCP generally consists of a concrete core, hightensile steel wires that spirally wound around the concrete, a steel cylinder encased in concrete, and a mortar coating layer. The prestressing wires are typically designed to withstand all of the hydrostatic pressure. Owing to corrosion and hydrogen embrittlement, prestressing wire may break. The rupture of pipe can lead to a catastrophe. It is necessary for water supply engineers to understand the wire-break process of PCCP and determine a feasible repair plan
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
