Cyclic load behavior of helical pile-to-pile cap connections subjected to uplift loads

Güner, Serhan; Chiluwal, Sundar

doi:10.1016/j.engstruct.2021.112667

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…According to the previous studies on the acceptable performance of the helical pile in uplift resisting (Sharma and Guner 2020;Guner and Chiluwal 2021;Mahmoudi-Mehrizi and Ghanbari 2021), using the helical piles under the tunnel can be effective for mitigating the tunnel uplift. However, there is a lack of information on the uplift resistance of the helical piles in liquefied soils during an earthquake.…”

Section: Introductionmentioning

confidence: 99%

Shaking Table Test on Mitigation of Liquefaction-Induced Tunnel Uplift by Helical Pile

2023

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The tunnels located in the shallow depths of loose saturated sand are significantly prone to liquefaction-induced uplift. Research works are, therefore, in progress to propose efficient techniques for mitigating uplift. In this study, 1 g physical modeling was used to assess the performance of helical piles for decreasing liquefaction-induced uplift. The effects of pile length, number of pile helixes, and the pile spacing in plan view were investigated. The uplift mechanism of the tunnel and helical pile system was also analyzed. The results demonstrate that the penetration of the helical piles into the dense layer underlying the superficial liquefiable sand has decreased tunnel uplift significantly. However, excessive close pile spacing along the tunnel resulted in shear surface interference, and the efficiency of the excessive number of helical piles decreased significantly. The detailed view of the uplift mechanism showed that utilization of the piles extended the transition phase of uplift during shaking. Helical piles can efficiently restrict the possibility of rapid uplift of the tunnel and shorten the duration of the primary uplift phase.

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Section: Introductionmentioning

confidence: 99%

Shaking Table Test on Mitigation of Liquefaction-Induced Tunnel Uplift by Helical Pile

2023

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“…Furthermore, the connection of the pile to the bearing is a critical aspect. Guner et al [29] simulated a nonlinear finite element model and experimentally validated it with 162 response simulations of a helical pile cap system; they quantified the effects of the end-joint bracket type, bracket embedment depth, reinforcement rate, shear span-depth ratio, and loading type. ANOVA and factorial design methods were used to quantify each parameter and measure the percentage contribution of multi-parameter interactions to the system capacity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Bending Resistance of New Type Joint of Prestressed Concrete Pipe Pile

2022

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In the field of PHC pile joints, it is important that prestressed high-strength concrete pipe piles are referred to as PHC pipe piles. In conventional hoops, bamboo-like joints protrude from the pile joint position at the surface of the pile. Driving the pile in, disturbing the soil around the pile, and affecting the frictional resistance are serious issues. To address such issues, herein, a new type of clamping joint is proposed. A new method is presented to determine the size of the new joint that is flushed with the surface of the pile at the joint position. Bending resistance tests are conducted on four types of new joints for common pipe piles to study the deformation development process, bending bearing capacity, and damage characteristics of the new joints. Cracks are mainly distributed in the pure bending section and are approximately symmetrically distributed along both sides of the joint; there is no obvious cracking and damage in the joint until the pile cracks. Under the same bending moment, the deflection in the span of all specimens is greater than the deflection at the loading point.

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Theoretical Study on the Influence of the Position of the Bearing Plate Under the Horizontal Load on the Failure State of the NT-CEP Pile

Qian

Sun

et al. 2022

2022 8th International Conference on Hydraulic and Civil Engineering: Deep Space Intelligent Development and Utilization Forum

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Cyclic load behavior of helical pile-to-pile cap connections subjected to uplift loads

Cited by 3 publications

References 37 publications

Shaking Table Test on Mitigation of Liquefaction-Induced Tunnel Uplift by Helical Pile

Shaking Table Test on Mitigation of Liquefaction-Induced Tunnel Uplift by Helical Pile

Experimental Study on Bending Resistance of New Type Joint of Prestressed Concrete Pipe Pile

Theoretical Study on the Influence of the Position of the Bearing Plate Under the Horizontal Load on the Failure State of the NT-CEP Pile

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