Effects of the Location of Broken Prestressing Wire Wraps in Structural Integrity of a Damaged PCCP

Alavinasab, Ali; Padewski, Edward; Higgins, Mike

doi:10.1061/9780784413012.071

Cited by 10 publications

(7 citation statements)

References 4 publications

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“…ere are four methods for modeling prestress in wires in FEA: the equivalent load method, initial strain method, equivalent cooling method, and wire-wrapping model [21]. In the equivalent load method used in most studies [18,[22][23][24][25][26][27][28][29][30], it does not consider the stiffness of wires and as a result it is difficult to simulate the stress increment in steel wires under the external loads in pipes with broken wires. In the strain method proposed by Lin [31], applying an initial strain to steel wires was used to model the prestressing force; however, the loss of prestressing force cannot be considered in this method because the loss of prestressing force is represented by stress.…”

Section: Fea Model and Materials Constitutive Modelsmentioning

confidence: 99%

Improvement and Implementation of Calculation Method for Prestressed Concrete Cylinder Pipes

Zhang

et al. 2022

Mathematical Problems in Engineering

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Prestressed concrete cylinder pipe (PCCP) is a type of composite pipes frequently used in water diversion projects. However, the existing methods for structural analysis of such pipes are complex; thus, very few standards are available for use in practical design. In this paper, the new straightforward technique for analyzing PCCP based on available standards is proposed in order to address the shortcomings of the existing standard and improve the convergence of subsequent calculations. The verification and comparison of case study given in the main standards showed that the proposed method is rational and useful. In addition, an advanced finite element model was utilized in practical design case that considered proper constitutive relationships, contact model, prestress of wires, and practical aspects of manufacturing, installation, and operation. Meantime, the results obtained by nonlinear FEA and the improved method are assessed and compared, which showed that nonlinear FEA based on corresponding intrinsic model and the improved method are recommendable to aid in practical design projects.

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Section: Fea Model and Materials Constitutive Modelsmentioning

confidence: 99%

Improvement and Implementation of Calculation Method for Prestressed Concrete Cylinder Pipes

Zhang

et al. 2022

Mathematical Problems in Engineering

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“…Additionally, it is not practical to fully model the actual condition of each damaged joint. To simplify the modeling details and reduce computational costs, in previous studies the joints were assumed to conservatively have no interaction or full interaction between the bell end and spigot end (Alavinasab et al, 2013;Alavinasab and Hajali, 2014;Hajali et al, 2015). In this paper, the interactions between the PCCPs were defined by normal behavior (hard contact) and tangential behavior (contact algorithm).…”

Section: Pccp Jointmentioning

confidence: 99%

“…As the number of broken wires increases, the bearing capacity of the PCCP sharply decreases, and the risk of pipe burst increases. Moreover, the wire break damage of the bell-and-spigot joint can decrease the overall strength of the PCCP more than that in the barrel of the pipe (Alavinasab et al, 2013;Hajali et al, 2015Hajali et al, , 2016b. Few studies available in the literature have thoroughly investigated the possible coupling disaster of PCCP pipelines in service.…”

Section: Introductionmentioning

confidence: 99%

Damage evaluation of a PCCP joint with a localized soil void and broken wires

Feng

Chen

et al. 2021

Advances in Structural Engineering

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During the service life of a pipeline, the surrounding soil may erode locally around the pipe due to seepage and leakage, making the pipe partially unsupported and weakening the pipe–soil interaction. The presence of soil voids provides the possibility for broken wires and further accelerates damage. In this paper, the stress and strain of PCCP joint in service under a localized soil void and with broken wires were investigated using the general finite element software ABAQUS, and the structural damage of the pipe joint under superimposed defects was evaluated. The numerical model contained two PCCP segments, a flexible joint and the surrounding soil. The preliminary study suggests that the superimposed defects of a soil void and broken wires can cause increased damage to the PCCP joint. With the addition of the soil void, the micro cracks of both the concrete core and mortar coating transform into visible cracks, and the relative wire breakage rate with coupling defects is reduced by approximately 36% to reach the elastic limit state of the pipe. The findings of this research highlight the importance of good pipe–soil interactions and could provide a theoretical reference for damage assessment and further repair strategies.

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“…Ge et al determined the effect of the adhesion quality of the mortar coating on the overall performance of PCCPs by only conducting elastic analysis [17]. The pipe performance as the water pressure and number of broken wires increased was studied by Alavinasab et al [18,19]. Then, Hajali et al [20,21] compared the effects of broken wire wraps in the middle of a pipe with those at a joint.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Location of Broken Wires on Prestressed Concrete Cylinder Pipes under Working Pressure

Zhang

Zhao

et al. 2022

Coatings

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The precise analysis of the overall mechanical performance of prestressed concrete cylinder pipes (PCCPs) with broken wires is a complicated problem. In this article, powerful finite element numerical means are applied to solve this problem. Firstly, the advantages and shortcomings of the current prestress simulation methods in the finite element analysis (FEA) literature are discussed, and the initial stress method based on a novel single-spring joint element method to model the pre-stress of wires is proposed. Then, different distributions of broken zones, including random broken distributions, are developed for two typical PCCP pipes with different wire-wrapped layers. The established nonlinear FEA model considers actual service processes such as manufacturing, installation and operation to investigate the mechanical behavior of two typical PCCP pipes with different breakage distribution regions and breakage ratios, and in particular, the overall mechanical behavior of a pipe with random breakage is determined first. To verify the accuracy of the proposed pre-stress simulation method and the established nonlinear finite element model, the overall mechanical response of a pipe before wires broke is compared with the results obtained via the specifications. The computed results under the corresponding breakage assumptions are consistent with the conclusions in the existing literature, providing important guidance for pipeline management and operation.

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Effects of the Location of Broken Prestressing Wire Wraps in Structural Integrity of a Damaged PCCP

Cited by 10 publications

References 4 publications

Improvement and Implementation of Calculation Method for Prestressed Concrete Cylinder Pipes

Improvement and Implementation of Calculation Method for Prestressed Concrete Cylinder Pipes

Damage evaluation of a PCCP joint with a localized soil void and broken wires

Effect of the Location of Broken Wires on Prestressed Concrete Cylinder Pipes under Working Pressure

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