Steel-Cylinder Yielding Analysis of PCCP with Broken Wires

2012 ◽  
Vol 503-504 ◽  
pp. 819-823 ◽  
Author(s):  
Ri You ◽  
Hong Bo Gong
Keyword(s):  
Prestressed Concrete ◽  
Pipe Wall ◽  
Nonlinear Finite Element ◽  
Simplified Model ◽  
Pipe Failure ◽  
Prestress Loss ◽  
Element Analysis ◽  
Steel Cylinder ◽  
Limit Stress ◽  
Prestressed Concrete Cylinder Pipe

The prestressing wires of prestressed concrete cylinder pipe (PCCP) provide pipe wall with compressive stress to resist internal pressure. Broken wires may cause yielding of steel cylinder and increase the risk of pipe failure with time. In order to reveal the mechanism of steel-cylinder yielding in PCCP with broken wires, a simplified model is developed and the maximum number of broken wires to preclude exceeding limit stress in steel cylinder can be determined conveniently by the equations derived in this paper. Verification analysis shows that the solution of simplified model agrees well with that of nonlinear finite element analysis. By comparing the calculated maximum number of broken wires with the detected actual number of broken wires, steel-cylinder yielding in prestress loss zone can be predicted, thus aiding condition assessment of PCCP

Failure Analysis of PCCP with Broken Wires

2012 ◽  
Vol 193-194 ◽  
pp. 855-858 ◽  
Author(s):  
Ri You ◽  
Hong Bo Gong
Keyword(s):  
Internal Pressure ◽  
Prestressed Concrete ◽  
Failure Process ◽  
Nonlinear Behavior ◽  
Prestress Loss ◽  
Element Analysis ◽  
Steel Cylinder ◽  
Fine Mesh ◽  
Prestressed Concrete Cylinder Pipe ◽  
Material Nonlinear

The prestressing wires of prestressed concrete cylinder pipe (PCCP) provide pipe wall with compressive stress to resist internal pressure. Broken wires resulting from corrosion is a major factor contributing to the degradation of pipe strength. In order to analysis the failure process of PCCP with broken wires, a 3-D model with a very fine mesh is developed for the pipe structure, considering material nonlinear behavior, pipe-earth interaction, prestress loss, and combined effects of external and internal loads. The results of nonlinear finite element analysis show that wire breaks causing prestress loss can accelerate the failure process of PCCP. As internal pressure increases, the earliest concrete cracking and steel-cylinder yielding occurs in the prestress loss zone. The closer to the prestress loss zone, the higher stress unbroken wires will have.

Analysis of Circumferential Cracking Due to Wire Breaks in PCCP

2012 ◽  
Vol 446-449 ◽  
pp. 2860-2865
Author(s):  
Ri You
Keyword(s):  
Prestressed Concrete ◽  
Pipe Wall ◽  
Actual Number ◽  
Prestress Loss ◽  
Element Analysis ◽  
Concrete Core ◽  
Pipe Length ◽  
Longitudinal Bending ◽  
Prestressed Concrete Cylinder Pipe ◽  
Monitoring Technologies

The prestressing wires of prestressed concrete cylinder pipe (PCCP) provide concrete core with compressive stress to resist internal pressure. Broken wires resulting from corrosion and embrittlement may cause cracking in pipe wall and increase the risk of failure with time. By developing a simplified model to reveal the mechanism of circumferential cracking due to wire breaks in PCCP, the longitudinal bending of pipe wall is analyzed, and the maximum number of broken wires can be determined conveniently by the equations derived in this paper. Verification against results of finite element analysis shows that the presented method has decent accuracy which is not significantly influenced by effective pipe length and wall thickness. By comparing the calculated maximum number of broken wires with the actual number of broken wires detected by inspection and monitoring technologies, circumferential cracking in prestress loss zone can be predicted, thus aiding condition assessment of PCCP.

Longitudinal Cracking Analysis of PCCP with Broken Wires

2012 ◽  
Vol 157-158 ◽  
pp. 976-981 ◽  
Author(s):  
Ri You
Keyword(s):  
Prestressed Concrete ◽  
Pipe Wall ◽  
Actual Number ◽  
Prestress Loss ◽  
Element Analysis ◽  
Pipe Length ◽  
Longitudinal Cracking ◽  
Prestressed Concrete Cylinder Pipe ◽  
Monitoring Technologies ◽  
Core Concrete

The prestressing wires of prestressed concrete cylinder pipe (PCCP) provide core concrete with compressive stress to resist internal pressure. Broken wires resulting from corrosion and embrittlement may cause cracking in pipe wall and increase the risk of failure with time. In order to reveal the mechanism of longitudinal cracking in PCCP with broken wires, a simplified model is developed and the maximum number of broken wires to preclude onset of longitudinal cracking can be determined conveniently by the equations derived in this paper. Verification against results of finite element analysis shows that the presented method has decent accuracy for appropriate effective pipe length and wall thickness. By comparing the calculated maximum number of broken wires with the actual number of broken wires detected by inspection and monitoring technologies, longitudinal cracking in prestress loss zone can be predicted, thus aiding condition assessment of PCCP.

The Development of Prestressed Concrete Cylinder Pipe in China

2014 ◽  
Vol 580-583 ◽  
pp. 2363-2366
Author(s):  
Hong Yu Zhang ◽  
Hua Peng ◽  
Xiang Chen
Keyword(s):  
Structural Properties ◽  
Prestressed Concrete ◽  
Development Process ◽  
Production Technique ◽  
Steel Cylinder ◽  
Concrete Cylinder ◽  
Water Transportation ◽  
Transportation Projects ◽  
Three Stages ◽  
Prestressed Concrete Cylinder Pipe

Prestressed Concrete Cylinder Pipe (PCCP) consists of a steel cylinder lined with concrete, then helically wrapped with a wire and coated with a dense mortar. PCCP has excellent structural properties, so it is widely used in various water-transportation projects around world. This paper presents a review of development of PCCP in China, which was summarized as three stages: the period of exploratory development, the period of cooperativedevelopment, and the period of independent development. The development process of design and production technique, the application in China, the construction and development prospect of PCCP were made a detailed discussion in each stage.

The Nonlinear Finite Element Analysis to Bonded Post-Tensioned Prestressed Concrete Frame Based on Two-Stage Loading Model

2013 ◽  
Vol 671-674 ◽  
pp. 591-595
Author(s):  
Ming Zheng Chen ◽  
Lin Qing Huang ◽  
Xiao Ying Chen ◽  
Li Ping Wang
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Strain Curve ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Arc Length ◽  
Stress Strain Curve ◽  
Element Analysis ◽  
Concrete Frame ◽  
Post Tensioned

According to the loading character of bonded post-tensioned prestressed concrete frame, the static nonlinear finite programme in this paper could be used to analysis the whole loading process to bonded post-tensioned prestressed concrete frame, which is divided into two different stages . From the stress-strain curve of materials and considering the concrete’ tension harding and compression softening, this programme uses the layered finite element model and arc-length method to analyse the bonded post-tensioned prestressed concrete frame, during the course it considers the material nonlinearity and geometric nonlinearity in the stiffness matrix. Through the contrast to experiment , the result of the programme fits well with the experiment. The programme can be used to compute and analyse the bonded post-tensioned prestressed concrete frame.

scholarly journals Rehabilitation Effect Evaluation of CFRP-Lined Prestressed Concrete Cylinder Pipe under Combined Loads Using Numerical Simulation

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
He Hu ◽  
Fujun Niu ◽  
Tiesheng Dou ◽  
Heng Zhang
Keyword(s):  
Prestressed Concrete ◽  
Three Dimensional ◽  
Steel Cylinder ◽  
Concrete Core ◽  
Concrete Cylinder ◽  
Combined Loads ◽  
Reinforced Polymer ◽  
Dimensional Finite Element ◽  
Prestressed Concrete Cylinder Pipe ◽  
Three Dimensional Finite Element

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.

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