Load transfer of hollow Fiber-Reinforced Polymer (FRP) piles in soft clay

Giraldo, John Mario García; Rayhani, Mohammad T.

doi:10.1016/j.trgeo.2014.03.002

Cited by 22 publications

(17 citation statements)

References 12 publications

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“…Full-scale tests using instrumented piles are required to accurately measure pile deformations along the shaft in order to characterise the pile stiffness non-linearity especially in hollow FRP piles and better predict pile deflections under working loads. Figure 5 reports the comparison between the axial load tests performed in the field in the present investigation and those performed by Giraldo and Rayhani (2014) on FRP piles inserted in a drum in laboratory. It may be seen that the general trend of the results of the two series of tests is similar, although the ultimate capacity values are not, with laboratory tests showing values up to 40% higher.…”

Section: Resultsmentioning

confidence: 96%

“…Following 48-h curing time, the piles were extracted from the mandrel and cut to the required length. The pile size was 700 mm in length and 55 mm in diameter, to compare the results with those obtained on piles of the same size in a drum in laboratory (Giraldo and Rayhani 2014).…”

Section: Pile Characteristicsmentioning

confidence: 99%

“…Giraldo and Rayhani (2014) investigated the frictional performance of hollow FRP piles in clayey soils using small-scale piles in undisturbed clay samples contained in a drum, comparing the load transfer mechanism of FRP piles to that of steel piles of similar size. The objective of this study is to investigate the load transfer of hollow FRP piles driven in cohesive soils in the field when subjected to axial and lateral loadings.…”

Section: Introductionmentioning

confidence: 99%

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Axial and lateral load transfer of fibre-reinforced polymer (FRP) piles in soft clay

Valez

Rayhani

2016

International Journal of Geotechnical Engineering

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This paper presents the results of an experimental investigation on the performance of fibre-reinforced polymer (FRP) piles in soft clay. The load transfer behaviour of small-scale FRP piles manufactured using either glass or carbon fibres is analysed and compared to that of traditional steel piles, in order to assess the viability of FRPs as piling materials. In addition, the effects of FRP material and fibre orientation on pile behaviour are investigated with the goal of identifying the optimal conditions for best performance. In all cases, the FRP piles present higher or at least similar capacity compared to steel piles. FRP surface topology, pile texture and waviness pattern dictated by the fibre weaving and orientation were found to exert a significant influence on the pile axial capacity. The lower stiffness of the FRP piles leads to increased pile head displacement under lateral loading compared to steel piles.

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Section: Resultsmentioning

confidence: 96%

Section: Pile Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Axial and lateral load transfer of fibre-reinforced polymer (FRP) piles in soft clay

Valez

Rayhani

2016

International Journal of Geotechnical Engineering

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“…The approximation of ultimate lateral capacity is usually conducted through a static equilibrium method that the theory of lateral earth pressure is applied to measure the forces acting along the pile shaft and evaluate equilibrium conditions (Giraldo, 2014). The conventional static approach described by Poulos and Davis (1980) assumes that the pile is slender, rigid (soil failure appears before pile failure, also indicated as "short piles") and pile head is free to rotate, and there is a point of rotation at an unidentified depth below ground level.…”

Section: Lateral Capacitymentioning

confidence: 99%

“…A typical approach suggested by Broms (1964a and1964b), considers soil type, pile type and pile head fixity by implementing simplified assumptions, such as distribution of lateral earth pressure along the pile shaft dependant on soil type (cohesive and/or cohesionless), and failure mechanisms depend on the yield moment of the actual pile. This method is typically used in initial design due to simplicity, though ultimate bearing capacity predicted through static approaches may take place at higher lateral deflections (Giraldo, 2014).…”

Section: Lateral Capacitymentioning

confidence: 99%

Evolution of Pile Shaft Capacity over Time in Soft Clays (Case Study: Leda Clay)

Hosseini¹

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This thesis presents a comprehensive experimental investigation to examine the evolution of pile shaft capacity over time. This phenomenon is observed in pile foundations that are driven into soft clays, and is referred to as pile set-up and/or freeze. This research consists of two phases which the first phase investigates the behavior of pile-soil interface over time using a modified direct shear test at two different loading rates of slow (0.05 mm/min.) and fast (2.5 mm/min.).These laboratory tests were used to understand the concept of pile-soil interface in relation with pile set-up. The second phase of this research involved a series of pile load testing which was performed on steel and concrete piles driven into Leda clay in a test site located in southeast of Ottawa region, called the Canadian Geotechnical Research Site No.1. The piles were tested immediately after driving to measure their initial bearing capacities, and were tested repeatedly over different elapsed time to study the change in pile shaft capacity over time. Meanwhile, the excess pore water pressure around the pile was also monitored by a pore water pressure sensor.The average pile capacity measurements for both steel and concrete piles indicated that there is approximately 4.5-5.5 times increase in the pile capacity after 30 days from the initial day depending on the type of the piles used. First and foremost, I would like to express my very great appreciation to my supervisor, Dr. Mohammad Rayhani, for his guidance, valuable suggestions and supports during the development of this research work. I gratefully thank my thesis committee and for their constructive clarifications on my thesis work. I would like to offer my special thanks to my colleagues for their invaluable support through my research program. I would also like to extend my thankfulness to the Civil and Environmental Engineering laboratory technicians for their help in providing information in proceeding the research program. Last but not the least, I would like to thank my family: mom and dad and to my brothers for supporting me spiritually throughout completing this thesis and encouraging me to continue my studies. Words may not express how thankful I am to my parents because their prayer for me was what supported me thus far.

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FRP–soil interfacial mechanical properties with molecular dynamics simulations: Insights into friction and creep behavior

Yin

Yuan-Yuan

2023

Num Anal Meth Geomechanics

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The fiber‐reinforced polymer (FRP) has attracted much attention in civil engineering due to its durability and cost‐effectiveness. The soil–FRP structure interface plays an essential role when the FRP is adopted in geotechnical engineering, but its fundamental interfacial behavior remains unclear. In the present study, the atomistic models of silica representing sand, water film representing the lubricated condition, and cross‐linked epoxy representing FRP are constructed to investigate the FRP–sand interfacial properties at the nano‐scale through molecular dynamics (MD) simulations. The epoxy model geometry and forcefield are first validated by comparing the thermodynamic and mechanical parameters with experimental and simulation measurements. The silica–epoxy interfacial tribological and rheological behavior is then explored by conducting friction and creep simulations under dry and lubricated conditions. The friction force has been found linearly dependent on the normal load and increases with the sliding velocity while decreasing against water content. The modified Amontons law for the adhering surface could describe the silica–epoxy interfacial friction well. The shear stress level influences the creep characteristics with primary, secondary, and tertiary (or rupture) creep modes. The results of this study at the nano‐scale can be further developed to enhance the current contact laws of sand–FRP structure in micromechanics‐based modeling approaches.

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Load transfer of hollow Fiber-Reinforced Polymer (FRP) piles in soft clay

Cited by 22 publications

References 12 publications

Axial and lateral load transfer of fibre-reinforced polymer (FRP) piles in soft clay

Axial and lateral load transfer of fibre-reinforced polymer (FRP) piles in soft clay

Evolution of Pile Shaft Capacity over Time in Soft Clays (Case Study: Leda Clay)

FRP–soil interfacial mechanical properties with molecular dynamics simulations: Insights into friction and creep behavior

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