The Experts below are selected from a list of 165 Experts worldwide ranked by ideXlab platform
Amjad J Aref - One of the best experts on this subject based on the ideXlab platform.
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experimental performance evaluation of Pipelines rehabilitated with cured in place Pipe Liner under earthquake transient ground deformations
Journal of Infrastructure Systems, 2017Co-Authors: Zilan Zhong, Andre Filiatrault, Amjad J ArefAbstract:AbstractThe cured-in-place Pipe (CIPP) Liner technology involves installation of flexible polymeric composite Liners coated with thermosetting resin to the inner surfaces of existing Pipelines. This innovative technology provides an efficient, economic, and environmentally friendly method for rehabilitation of structurally compromised underground Pipelines without expensive and disruptive excavation. However, the unverified and unquantified seismic performance of CIPP Liner-reinforced Pipelines under earthquake transient ground deformations (TGD) remains a barrier to the deployment of this technology in seismically active regions. Full-scale quasi-static and dynamic tests were performed on five water-pressurized ductile iron (DI) Pipelines, with 150-mm (6.0-in.) nominal diameter and 9.14-m (30-ft) nominal length, reinforced with one type of CIPP Liner commonly used in engineering practice. This paper evaluates experimentally the behavior of the Liner-strengthened DI Pipelines under static loading and also...
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numerical simulation and seismic performance evaluation of buried Pipelines rehabilitated with cured in place Pipe Liner under seismic wave propagation
Earthquake Engineering & Structural Dynamics, 2017Co-Authors: Zilan Zhong, Andre Filiatrault, Amjad J ArefAbstract:Summary The cured-in-place-Pipe (CIPP) Liner technology involves installation of flexible polymeric composite Liners coated with thermosetting resin to the inner surfaces of existing buried Pipelines. This innovative technology provides an efficient, economic, and environmentally friendly alternative for rehabilitation of structurally compromised underground Pipelines without expensive and disruptive excavation. However, the lack of analytical/numerical procedures to quantify the seismic performance of CIPP Liner reinforced Pipelines remains a barrier to the seismic design and rehabilitation of underground Pipelines. This paper first develops an experimentally validated hysteretic model of ductile iron push-on joints, reinforced with one particular type of CIPP Liner under repeated axial loading. A numerical procedure is then proposed to systematically assess the seismic performance and fragility of straight buried Pipelines incorporating push-on joints and subjected to transient ground deformations. The numerical results indicate that CIPP Liner-reinforced Pipelines exhibit favorable robust seismic performance with limited joint damage under high-intensity transient ground deformations. Copyright © 2016 John Wiley & Sons, Ltd.
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Numerical simulation and seismic performance evaluation of buried Pipelines rehabilitated with cured‐in‐place‐Pipe Liner under seismic wave propagation
Earthquake Engineering & Structural Dynamics, 2016Co-Authors: Zilan Zhong, Andre Filiatrault, Amjad J ArefAbstract:Summary The cured-in-place-Pipe (CIPP) Liner technology involves installation of flexible polymeric composite Liners coated with thermosetting resin to the inner surfaces of existing buried Pipelines. This innovative technology provides an efficient, economic, and environmentally friendly alternative for rehabilitation of structurally compromised underground Pipelines without expensive and disruptive excavation. However, the lack of analytical/numerical procedures to quantify the seismic performance of CIPP Liner reinforced Pipelines remains a barrier to the seismic design and rehabilitation of underground Pipelines. This paper first develops an experimentally validated hysteretic model of ductile iron push-on joints, reinforced with one particular type of CIPP Liner under repeated axial loading. A numerical procedure is then proposed to systematically assess the seismic performance and fragility of straight buried Pipelines incorporating push-on joints and subjected to transient ground deformations. The numerical results indicate that CIPP Liner-reinforced Pipelines exhibit favorable robust seismic performance with limited joint damage under high-intensity transient ground deformations. Copyright © 2016 John Wiley & Sons, Ltd.
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Seismic Performance Evaluation of Buried Pipelines Retrofitted with Cured-in-Place Pipe Liner Technology under Near-Fault Ground Motions
Structures Congress 2015, 2015Co-Authors: Zilan Zhong, Amjad J Aref, Andre FiliatraultAbstract:Seismic vulnerability of buried Pipelines has been identified in many post-earthquake reconnaissance reports. Efficient retrofit of critical lifelines to improve their seismic performance becomes an urgent requirement nowadays. The cured in place Pipe (CIPP) Liner technology is an effective trenchless method for repairing existing underground lifelines with minimal ground surface disruption. However, the seismic performance of CIPP Liner-reinforced Pipelines is lacking verification and quantification. This paper presents and discusses the results of full-scale quasi-static and seismic tests conducted on water-pressurized ductile iron (DI) Pipelines reinforced with one type of CIPP. The axial behavior of the Liner-strengthened DI Pipelines under static cyclic loading and their seismic response under transient ground deformations (TGD) during earthquakes has been investigated in this paper. Moreover, numerical models have been developed to simulate the axial behavior of Liner-reinforced joints under cyclic loading. The results indicate that CIPP Liner substantially increases the longitudinal stiffness and strength of the joints of segmental DI Pipelines and significantly improves their seismic behavior under high intensity TGD. Author keywords: Cured in Place Pipeline (CIPP); Transient Ground Deformations (TGD); Critical lifelines; Seismic rehabilitation; Shake table testing; Soil-Pipe interaction
Ian D. Moore - One of the best experts on this subject based on the ideXlab platform.
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Response of Repaired Sewers under Earthloads
Transportation Research Record, 2020Co-Authors: Ian D. MooreAbstract:The trenchless rehabilitation of damaged rigid sewers has become a competitive alternative to conventional methods of Pipeline replacement. However, buckling caused by fluid load is identified as the important limit state in the current Pipe-Liner design standard, while the contribution of the damaged rigid host Pipe in the assessment of resistance to earth loads as well as disturbance to the Liner (e.g., vehicle loads) is neglected. Full-scale testing in the laboratory is used to investigate the soil-host and Pipe-Liner interaction. Two host-Pipe-Liner systems are examined. The first system involves a Liner that fits perfectly inside a host Pipe. The second system features initial lack of fit between the Liner and the host Pipe, and gaps across the fractures in the host Pipe, to investigate ungrouted repair of rigid Pipe with severe damage. The test geometry and measurement scheme to evaluate local bending and movement at the fractures in the host Pipe are described. Key parameters affecting local bending are identified, including initial lack of fit between the Liner and the host Pipe as well as the hoop stiffness of the host Pipe. This recent research on repair of sanitary and storm water sewers is discussed in the context of culvert rehabilitation.
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Analysis of a cured-in-place pressure Pipe Liner spanning circular voids
Tunnelling and Underground Space Technology, 2020Co-Authors: Michael J.p. Brown, Ian D. MooreAbstract:Abstract The performance of a commercially available cured-in-place Pipe (CIPP) Liner as it spans circular voids in its host Pipe is examined using finite element analyses. A three dimensional model is presented and compared to an existing axisymmetric model. The effect of friction and the orthotropic nature of the Liner’s material are also investigated. Lastly, the internal pressure at failure is estimated for a number of void sizes through simulated burst tests using a conditional equation from ASTM F1216-16 along with the interactive and maximum stress failure criteria from ASTM F2207-06. It is recommended that a multi-axial strength criterion be used for smaller void sizes that conform with the conditional equation, while the uniaxial strength criterion be used for larger void sizes that do not satisfy the conditional equation.
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performance of a cured in place pressure Pipe Liner passing through a Pipe section without structural integrity
Tunnelling and Underground Space Technology, 2014Co-Authors: Michael J.p. Brown, Ian D. MooreAbstract:Abstract The performance of a cured-in-place Pipe (CIPP) Liner as it spans a section of host Pipe that has lost its structural integrity is examined through finite element analyses. Orthotropic and nonlinear analyses are used to examine 3D effects. The 3D analysis is compared to an earlier axisymmetric model. The effects of friction between the Liner and the old Pipe as well as the orthotropic material properties of the Liner are investigated. Failure pressures and unconfined hoop displacements are calculated using failure criteria from ASTM F2207-06 and it is concluded that the Liner response is dominated by uniaxial rather than multiaxial strength properties. Lastly, it is recommended that the maximum stress criterion be used over the interactive stress criterion for this loading condition.
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Numerical modeling of tight fitting flexible Liner in damaged sewer under earth loads
Tunnelling and Underground Space Technology, 2007Co-Authors: Ian D. MooreAbstract:Abstract Finite element analysis and closed form solutions are used to investigate and interpret tests conducted on a damaged rigid Pipe fitted with an HDPE Pipe Liner. Details of the analysis are described, including the modeling of local interactions between the Liner and the host Pipe, different segments of the damaged host Pipe across longitudinal fractures, and the host Pipe and the surrounding ground. Laboratory tests on a lined sewer Pipe under earth loads are studied to establish whether finite element and closed form solutions for the repaired Pipe system are able to effectively represent the observed behaviour. The deteriorated rigid Pipe is fractured into four fragments, and these interact to impose pairs of closely spaced vertical line loads at the crown and invert of the Liner. The finite element analysis demonstrates that significant local bending develops in the Liner under these contact forces. Very little thrust develops in the Liner, which is almost in pure bending provided the host Pipe can still carry hoop thrust across fractures. The angular expansion of the fractures at crown and invert had a negligible effect on the local bending in the Liner, allowing the use of theory for rings under parallel plate loading to provide simple calculations of Liner response. Nonlinear finite element analyses indicate that the interface between the Liner and the host Pipe is close to the full-slip (or smooth) condition. Analysis results for that condition are within 10% of the measured values. The finite element procedure also indicates that the host Pipe and the Liner within it deform under the effect of the full overburden pressure if the host Pipe fractures after the Liner is installed. Safe Liner design could be achieved by ensuring that local bending associated with host Pipe fracture and deformation under the full overburden pressures does not exceed tensile capacity of the polymer (in addition to Liner design to resist buckling under external fluid pressure, in accordance with previous Liner stability studies). Alternatively, measures might be used to avoid local bending in the Liner by preventing deterioration of the host Pipe and the surrounding soil during the design life of the repair.
Zilan Zhong - One of the best experts on this subject based on the ideXlab platform.
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experimental performance evaluation of Pipelines rehabilitated with cured in place Pipe Liner under earthquake transient ground deformations
Journal of Infrastructure Systems, 2017Co-Authors: Zilan Zhong, Andre Filiatrault, Amjad J ArefAbstract:AbstractThe cured-in-place Pipe (CIPP) Liner technology involves installation of flexible polymeric composite Liners coated with thermosetting resin to the inner surfaces of existing Pipelines. This innovative technology provides an efficient, economic, and environmentally friendly method for rehabilitation of structurally compromised underground Pipelines without expensive and disruptive excavation. However, the unverified and unquantified seismic performance of CIPP Liner-reinforced Pipelines under earthquake transient ground deformations (TGD) remains a barrier to the deployment of this technology in seismically active regions. Full-scale quasi-static and dynamic tests were performed on five water-pressurized ductile iron (DI) Pipelines, with 150-mm (6.0-in.) nominal diameter and 9.14-m (30-ft) nominal length, reinforced with one type of CIPP Liner commonly used in engineering practice. This paper evaluates experimentally the behavior of the Liner-strengthened DI Pipelines under static loading and also...
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numerical simulation and seismic performance evaluation of buried Pipelines rehabilitated with cured in place Pipe Liner under seismic wave propagation
Earthquake Engineering & Structural Dynamics, 2017Co-Authors: Zilan Zhong, Andre Filiatrault, Amjad J ArefAbstract:Summary The cured-in-place-Pipe (CIPP) Liner technology involves installation of flexible polymeric composite Liners coated with thermosetting resin to the inner surfaces of existing buried Pipelines. This innovative technology provides an efficient, economic, and environmentally friendly alternative for rehabilitation of structurally compromised underground Pipelines without expensive and disruptive excavation. However, the lack of analytical/numerical procedures to quantify the seismic performance of CIPP Liner reinforced Pipelines remains a barrier to the seismic design and rehabilitation of underground Pipelines. This paper first develops an experimentally validated hysteretic model of ductile iron push-on joints, reinforced with one particular type of CIPP Liner under repeated axial loading. A numerical procedure is then proposed to systematically assess the seismic performance and fragility of straight buried Pipelines incorporating push-on joints and subjected to transient ground deformations. The numerical results indicate that CIPP Liner-reinforced Pipelines exhibit favorable robust seismic performance with limited joint damage under high-intensity transient ground deformations. Copyright © 2016 John Wiley & Sons, Ltd.
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Numerical simulation and seismic performance evaluation of buried Pipelines rehabilitated with cured‐in‐place‐Pipe Liner under seismic wave propagation
Earthquake Engineering & Structural Dynamics, 2016Co-Authors: Zilan Zhong, Andre Filiatrault, Amjad J ArefAbstract:Summary The cured-in-place-Pipe (CIPP) Liner technology involves installation of flexible polymeric composite Liners coated with thermosetting resin to the inner surfaces of existing buried Pipelines. This innovative technology provides an efficient, economic, and environmentally friendly alternative for rehabilitation of structurally compromised underground Pipelines without expensive and disruptive excavation. However, the lack of analytical/numerical procedures to quantify the seismic performance of CIPP Liner reinforced Pipelines remains a barrier to the seismic design and rehabilitation of underground Pipelines. This paper first develops an experimentally validated hysteretic model of ductile iron push-on joints, reinforced with one particular type of CIPP Liner under repeated axial loading. A numerical procedure is then proposed to systematically assess the seismic performance and fragility of straight buried Pipelines incorporating push-on joints and subjected to transient ground deformations. The numerical results indicate that CIPP Liner-reinforced Pipelines exhibit favorable robust seismic performance with limited joint damage under high-intensity transient ground deformations. Copyright © 2016 John Wiley & Sons, Ltd.
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Seismic Performance Evaluation of Buried Pipelines Retrofitted with Cured-in-Place Pipe Liner Technology under Near-Fault Ground Motions
Structures Congress 2015, 2015Co-Authors: Zilan Zhong, Amjad J Aref, Andre FiliatraultAbstract:Seismic vulnerability of buried Pipelines has been identified in many post-earthquake reconnaissance reports. Efficient retrofit of critical lifelines to improve their seismic performance becomes an urgent requirement nowadays. The cured in place Pipe (CIPP) Liner technology is an effective trenchless method for repairing existing underground lifelines with minimal ground surface disruption. However, the seismic performance of CIPP Liner-reinforced Pipelines is lacking verification and quantification. This paper presents and discusses the results of full-scale quasi-static and seismic tests conducted on water-pressurized ductile iron (DI) Pipelines reinforced with one type of CIPP. The axial behavior of the Liner-strengthened DI Pipelines under static cyclic loading and their seismic response under transient ground deformations (TGD) during earthquakes has been investigated in this paper. Moreover, numerical models have been developed to simulate the axial behavior of Liner-reinforced joints under cyclic loading. The results indicate that CIPP Liner substantially increases the longitudinal stiffness and strength of the joints of segmental DI Pipelines and significantly improves their seismic behavior under high intensity TGD. Author keywords: Cured in Place Pipeline (CIPP); Transient Ground Deformations (TGD); Critical lifelines; Seismic rehabilitation; Shake table testing; Soil-Pipe interaction
Andre Filiatrault - One of the best experts on this subject based on the ideXlab platform.
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experimental performance evaluation of Pipelines rehabilitated with cured in place Pipe Liner under earthquake transient ground deformations
Journal of Infrastructure Systems, 2017Co-Authors: Zilan Zhong, Andre Filiatrault, Amjad J ArefAbstract:AbstractThe cured-in-place Pipe (CIPP) Liner technology involves installation of flexible polymeric composite Liners coated with thermosetting resin to the inner surfaces of existing Pipelines. This innovative technology provides an efficient, economic, and environmentally friendly method for rehabilitation of structurally compromised underground Pipelines without expensive and disruptive excavation. However, the unverified and unquantified seismic performance of CIPP Liner-reinforced Pipelines under earthquake transient ground deformations (TGD) remains a barrier to the deployment of this technology in seismically active regions. Full-scale quasi-static and dynamic tests were performed on five water-pressurized ductile iron (DI) Pipelines, with 150-mm (6.0-in.) nominal diameter and 9.14-m (30-ft) nominal length, reinforced with one type of CIPP Liner commonly used in engineering practice. This paper evaluates experimentally the behavior of the Liner-strengthened DI Pipelines under static loading and also...
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numerical simulation and seismic performance evaluation of buried Pipelines rehabilitated with cured in place Pipe Liner under seismic wave propagation
Earthquake Engineering & Structural Dynamics, 2017Co-Authors: Zilan Zhong, Andre Filiatrault, Amjad J ArefAbstract:Summary The cured-in-place-Pipe (CIPP) Liner technology involves installation of flexible polymeric composite Liners coated with thermosetting resin to the inner surfaces of existing buried Pipelines. This innovative technology provides an efficient, economic, and environmentally friendly alternative for rehabilitation of structurally compromised underground Pipelines without expensive and disruptive excavation. However, the lack of analytical/numerical procedures to quantify the seismic performance of CIPP Liner reinforced Pipelines remains a barrier to the seismic design and rehabilitation of underground Pipelines. This paper first develops an experimentally validated hysteretic model of ductile iron push-on joints, reinforced with one particular type of CIPP Liner under repeated axial loading. A numerical procedure is then proposed to systematically assess the seismic performance and fragility of straight buried Pipelines incorporating push-on joints and subjected to transient ground deformations. The numerical results indicate that CIPP Liner-reinforced Pipelines exhibit favorable robust seismic performance with limited joint damage under high-intensity transient ground deformations. Copyright © 2016 John Wiley & Sons, Ltd.
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Numerical simulation and seismic performance evaluation of buried Pipelines rehabilitated with cured‐in‐place‐Pipe Liner under seismic wave propagation
Earthquake Engineering & Structural Dynamics, 2016Co-Authors: Zilan Zhong, Andre Filiatrault, Amjad J ArefAbstract:Summary The cured-in-place-Pipe (CIPP) Liner technology involves installation of flexible polymeric composite Liners coated with thermosetting resin to the inner surfaces of existing buried Pipelines. This innovative technology provides an efficient, economic, and environmentally friendly alternative for rehabilitation of structurally compromised underground Pipelines without expensive and disruptive excavation. However, the lack of analytical/numerical procedures to quantify the seismic performance of CIPP Liner reinforced Pipelines remains a barrier to the seismic design and rehabilitation of underground Pipelines. This paper first develops an experimentally validated hysteretic model of ductile iron push-on joints, reinforced with one particular type of CIPP Liner under repeated axial loading. A numerical procedure is then proposed to systematically assess the seismic performance and fragility of straight buried Pipelines incorporating push-on joints and subjected to transient ground deformations. The numerical results indicate that CIPP Liner-reinforced Pipelines exhibit favorable robust seismic performance with limited joint damage under high-intensity transient ground deformations. Copyright © 2016 John Wiley & Sons, Ltd.
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Seismic Performance Evaluation of Buried Pipelines Retrofitted with Cured-in-Place Pipe Liner Technology under Near-Fault Ground Motions
Structures Congress 2015, 2015Co-Authors: Zilan Zhong, Amjad J Aref, Andre FiliatraultAbstract:Seismic vulnerability of buried Pipelines has been identified in many post-earthquake reconnaissance reports. Efficient retrofit of critical lifelines to improve their seismic performance becomes an urgent requirement nowadays. The cured in place Pipe (CIPP) Liner technology is an effective trenchless method for repairing existing underground lifelines with minimal ground surface disruption. However, the seismic performance of CIPP Liner-reinforced Pipelines is lacking verification and quantification. This paper presents and discusses the results of full-scale quasi-static and seismic tests conducted on water-pressurized ductile iron (DI) Pipelines reinforced with one type of CIPP. The axial behavior of the Liner-strengthened DI Pipelines under static cyclic loading and their seismic response under transient ground deformations (TGD) during earthquakes has been investigated in this paper. Moreover, numerical models have been developed to simulate the axial behavior of Liner-reinforced joints under cyclic loading. The results indicate that CIPP Liner substantially increases the longitudinal stiffness and strength of the joints of segmental DI Pipelines and significantly improves their seismic behavior under high intensity TGD. Author keywords: Cured in Place Pipeline (CIPP); Transient Ground Deformations (TGD); Critical lifelines; Seismic rehabilitation; Shake table testing; Soil-Pipe interaction
Jingyu Zhang - One of the best experts on this subject based on the ideXlab platform.
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Factors Affecting Stress Crack Resistance of Corrugated High-Density Polyethylene Pipe (With Discussion and Closure)
Transportation Research Record, 2020Co-Authors: Yick Grace Hsuan, Patrick L. Gurian, Jingyu ZhangAbstract:In the AASHTO M294 specification for high-density polyethylene corrugated Pipe, the stress crack resistance (SCR) property is determined on the basis of the performance of virgin Pipe resins. The specification requires Pipe resins to have a failure time greater than 24 h by using the notched constant ligament stress test. However, SCR of the finished Pipe can be significantly different than that of the corresponding resin because of the effects of additives such as carbon black, regrind, and manufacturing processing. As part of the NCHRP 4-26 project, the effects of carbon black, percentage of regrind material, and Pipe processing on SCR were evaluated. Twenty-four Pipes and 13 resins from five manufacturers were tested. For the majority of resins, carbon black decreased SCR of the resin. The effect of regrind on SCR varied substantially from Pipe to Pipe; however, increasing the regrind from 10% to 20% did not show significant changes. The manufacturing process was found to have the greatest effect on the reduction of SCR. The influencing factors and 95% confidence interval were established between Pipe resin and Pipe plaque and between Pipe Liner and Pipe plaque. The proposed minimum failure times for SCR of virgin resin, Pipe plaque, and Pipe Liner are 33, 24, and 18 h, respectively. The data indicate that Pipes with qualified resin may not necessarily pass the Pipe Liner proposed value. Thus, an SCR specification on Pipe Liner is more critical than a virgin resin.
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Part 7: Culverts and Hydraulic Structures: Stress Crack Resistance of Corrugated High-Density Polyethylene Pipes in Different Test Environments and Temperatures
Transportation Research Record, 2020Co-Authors: Y. Hsuan, Jingyu ZhangAbstract:Corrugated high-density polyethylene (HDPE) Pipe 36 in. (900 mm) in diameter was evaluated for its stress crack resistance with the notched constant ligament stress test (ASTM F 2136). Test specimens were taken directly from the Pipe Liner to include the processing effects. In addition to the standard test condition of 10% Igepal solution at 50°C, tests were performed in water and air at temperatures of 60°, 70°, and 80°C. The test data were analyzed with the ISO 9080 method to define the transition point and ductile-to-brittle curve. The results indicate that the 10% Igepal solution greatly accelerates the stress cracking process, whereas the stress cracking behavior in water and in air is aggressive and practically the same. Activation energies in both ductile and brittle portions of the curve are in general agreement with the literature for HDPE resins. The results indicate that the rate processing method is an accurate model with which to extrapolate data from elevated test temperatures to lower servi...
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Stress Crack Resistance of Corrugated High-Density Polyethylene Pipes in Different Test Environments and Temperatures
Transportation Research Record, 2020Co-Authors: Yick Grace Hsuan, Jingyu ZhangAbstract:Corrugated high-density polyethylene (HDPE) Pipe 36 in. (900 mm) in diameter was evaluated for its stress crack resistance with the notched constant ligament stress test (ASTM F 2136). Test specimens were taken directly from the Pipe Liner to include the processing effects. In addition to the standard test condition of 10% Igepal solution at 50 deg C, tests were performed in water and air at temperatures of 60 deg, 70 deg, and 80 deg C. The test data were analyzed with the ISO 9080 method to define the transition point and ductile-to-brittle curve. The results indicate that the 10% Igepal solution greatly accelerates the stress cracking process, whereas the stress cracking behavior in water and in air is aggressive and practically the same. Activation energies in both ductile and brittle portions of the curve are in general agreement with the literature for HDPE resins. The results indicate that the rate processing method is an accurate model with which to extrapolate data from elevated test temperatures to lower service temperatures. However, Popelar’s shift method tends to overestimate the failure times.