Effect of the Number of Broken Wire Wraps on the Structural Performance of PCCP with Full Interaction at the Gasket Joint

Hajali, Masood; Alavinasab, Ali; Shdid, Caesar Abi

doi:10.1061/(asce)ps.1949-1204.0000219

Cited by 20 publications

(8 citation statements)

References 16 publications

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“…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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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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“…Sun et al 7 analyzed the key factors affecting the rotation angle of PCCP on soft soil foundation based on field tests and numerical calculations, and proposed some measures to control the rotation angle of joint. Hajali et al [8][9][10] studied the effect of wire broken position and number on the ultimate internal pressure of PCCP through a three-dimensional (3D) nonlinear finite element model, and the interaction between bell and spigot was considered, the results of which showed that the occurrence of wire broken at joint can influence the performance of PCCP mostly. Hu et al 11 analyzed the relationship between settlement and rotation angle at joints through laboratory tests, and studied the strain distribution at joints.…”

Section: Introductionmentioning

confidence: 99%

Mechanical responses of bell‐and‐spigot joints in buried prestressed concrete cylinder pipe under coupled service and surcharge loads

Zhai

Zhang

Fang

et al. 2020

Structural Concrete

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Prestressed concrete cylinder pipe (PCCP) is widely used in hydraulic engineering. The bell-and-spigot joint is a weak point along a PCCP pipeline, since damage of joint can affect the operation of the whole pipeline. In this paper, a threedimensional numerical model of buried PCCP, considering the simulation of rubber gasket in bell-and-spigot joint is established. The fluid-structure coupling of PCCP is accomplished using the Mesh-based parallel Code Coupling Interface (MpCCI), where the pipe and the surrounding soil are characterized in the software ABAQUS, and the pressurized water is modeled in the software FLUENT. The force and rotation angle at joints of PCCP under different conditions, including surcharge load, loading location, cover depth, and internal pressure, are analyzed. It is shown that the rotation angle of joint exceeds the allowable value, when the surcharge load is greater than 180 kPa. Compared with the effect of surcharge load, the offset distance (i.e., distance between the loading position and the pipe axis) has a greater influence on the development of horizontal displacement and rotation angle. As the offset distance increases, both the horizontal displacement and rotation angle at joints increase first, and they decrease after the peak. K E Y W O R D Sbell-and-spigot joint, fluid-structure coupling, mechanical response, prestressed steel cylinder concrete pipe (PCCP), surcharge load Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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“…They suggested that broken wires do not have a significant impact on a PCCP with good mortar adhesion. Hajali et al [24][25][26] considered the pipe-soil interaction, the interaction between neighboring pipes, and internal and external loads in modeling the effects of the position and number of broken wires on a PCCP using a three-dimensional finite element model.…”

Section: Introductionmentioning

confidence: 99%

Using Externally Bonded CFRP to Repair a PCCP with Broken Wires under Combined Loads

Zhai

Fang

et al. 2019

International Journal of Polymer Science

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Prestressed concrete cylinder pipe (PCCP) is widely used for long-distance water pipelines throughout the world. However, prestressing wire breakage is the most common form of PCCP damage. For some pipelines that cannot be shut down, a new technique for in-service PCCP repair by externally bonding the pipe with layers of carbon fiber reinforced polymer (CFRP) was proposed. A set of three-dimensional finite element models of the repaired PCCP have been proposed and implemented in the ABAQUS software, which took into account the soil pressure, the weight of the PCCP, the weight of the water, and the hydrostatic pressure. The stress–strain features of the PCCP repaired with CFRP of various thicknesses were analyzed. The stress–strain features of different wire breakage rates for the repaired PCCP were also analyzed. The results showed that the strains and stresses decreased at the springline if the PCCP was repaired with CFRP, which improved the operation of the PCCP. It has been found that the wire breakage rates had a significant effect on the strains and stresses of each PCCP component, but CFRP failed to reach its potential tensile strength when other materials were broken.

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Effect of the Number of Broken Wire Wraps on the Structural Performance of PCCP with Full Interaction at the Gasket Joint

Cited by 20 publications

References 16 publications

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

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

Mechanical responses of bell‐and‐spigot joints in buried prestressed concrete cylinder pipe under coupled service and surcharge loads

Using Externally Bonded CFRP to Repair a PCCP with Broken Wires under Combined Loads

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