Fracture and Delamination Assessment of Prestressed Composite Concrete for Use with Pipe Jacking Method

Qing, Gong; Zhu, Hehua; Yan, Zhiguo; Huang, Boqi; Zhang, Yao; Dong, Zhiyu

doi:10.1155/2015/579869

Cited by 9 publications

(6 citation statements)

References 34 publications

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“…4(a). The thermodynamic analogy method (Gong et al 2015;Zhai et al 2021) is used in this paper to apply the prestress in algorithms. The principle of this method is shown in Fig.…”

Section: Algorithm Implementation Of Prestress and The Correctness Of...mentioning

confidence: 99%

“…In Section 2, we propose the general form of the constraint equations for PBC applicable to lattice structures. And the thermodynamic analogy method is introduced which can apply the prestress in FEA (Gong et al 2015;Zhai et al 2021). In Section 3, the initial damage surfaces of four kinds of prestressed lattices under PBC are given and the effects of various influence factors on the damage surfaces is discussed.…”

Section: Introductionmentioning

confidence: 99%

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Prestress-mediated damage strength of lattice metamaterials and its optimization

Liu

Soh

2023

Preprint

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Lattice metamaterials have been attracting wide research interests due to their excellent mechanical properties. Most of meta-properties have been implemented by proper geometric designs of microstructures. In this study, we examine another way to obtain outstanding properties, which has been relatively less explored. That is, we aim to adjust the loading bearing capability of lattices by periodically introducing prestress into particular lattice segments. Based on existing related works, we focus on the following two problems deserving further investigations. First, results have been provided based on a single cell with/without taking into account the interactions between each two of neighboring individual cells. Second, it is interesting to search for the optimal distribution of prestress in lattices subjected to a specific load. For the former, we propose a set of constraint equations for implementing periodic boundary conditions (PBC) on a periodic unit cell and confirm its correctness. The significance of PBC related to rotational degrees of freedom is emphasized. We then use the proposed method to calculate the initial damage surface of four kinds of prestressed lattice unit cells under PBC. For the latter, we build a new optimization algorithm with the help of the so-called Symbiotic-Organisms-Search technique (SOS), to calculate the optimal prestress setting corresponding to the requested properties. As an example, the optimal prestress setting is found to almost double the critical load to failure of the lattice in a special direction. This work may be helpful to design lattice metamaterials with programmable strengths.

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“…4(a). The thermodynamic analogy method (Gong et al 2015;Zhai et al 2021) is used in this paper to apply the prestress in algorithms. The principle of this method is shown in Fig.…”

Section: Algorithm Implementation Of Prestress and The Correctness Of...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prestress-mediated damage strength of lattice metamaterials and its optimization

Liu

Soh

2023

Preprint

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“…where f s is the stress of prestressing wire; ε s is the strain of prestressing wire; E s is the elastic modulus of prestressing wire; f su is the tensile strength of prestressing wire. Prestress in the steel wire is applied by the temperature method, [39][40][41] and the temperature gradient is determined by the following formula:…”

Section: Model Of Pccp and Soilmentioning

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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“…Hu et al [13] conducted an external load prototype test and modeled the PCCP used in the South-to-North Water Diversion Project to predict the effects of existing cracks in the concrete core of the PCCP. Gong et al [14] conducted fullscale experimental research and modeling to evaluate the damage caused during pipe jacking by different jacking forces and different geological conditions. Sun et al [15] combined testing and numerical analysis to identify the key factors controlling the rotation of PCCP pipelines and to guide PCCP design and engineering on soft soil foundations.…”

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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Fracture and Delamination Assessment of Prestressed Composite Concrete for Use with Pipe Jacking Method

Cited by 9 publications

References 34 publications

Prestress-mediated damage strength of lattice metamaterials and its optimization

Prestress-mediated damage strength of lattice metamaterials and its optimization

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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