Axial monotonic and cyclic performance of fibre-reinforced polymer (FRP) – steel fibre–reinforced helical pulldown micropiles (FRP-RHPM)

SharnoubyM.M., El; NaggarM.H., El

doi:10.1139/cgj-2012-0009

Cited by 18 publications

(4 citation statements)

References 11 publications

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“…The environmental cyclic loads are predominant in many applications of helical anchors, which need to be properly considered during design. The cyclic and post-cyclic responses of helical anchors with different geometries and the variations of loads the helix and shaft can resist during cyclic loading under different cyclic loading parameters and different loading sequences with different amplitudes in different soils have been investigated by 1 g model tests, centrifuge and field tests [8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…They found that the triple-helical anchor has the best cyclic performance under long-term dynamic loading, while cyclic loads at 25-40% of the static uplift capacity may visibly increase the post-dynamic uplift capacity and minimize the long-term creep, while the amplitude of cyclic load has a greater influence on the dynamic response of the helical anchor than the maximum load. Sharnouby and Naggar [12,13] conducted field tests on steel fiber-reinforced helical pulldown micropiles under axial compressive cyclic loading to study the cyclic bearing characteristics and load transfer mechanism of piles under different loading sequences. Newgard et al [14] performed static and cyclic loading tests on a helical anchor model at shallow embedment in saturated medium-dense sand and observed the rapid increase in the rate of accumulation of displacements when the anchor reaches the displacement near the peak static load and the degradation of post-cyclic capacity.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on Behavior of Single-Helix Anchor in Sand Subjected to Uplift Cyclic Loading

Hao

Che

Chen

et al. 2022

JMSE

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Helical anchors have been widely used in geotechnical engineering due to their large uplift resistance. However, the current knowledge of the cyclic performance of helical anchors is still insufficient. Consequently, a series of small-scale model tests are carried out in sand to investigate the influences of embedment ratio, sand compactness and the cyclic parameters on the monotonic, cyclic and post-cyclic performance of single-helix anchors. The tests results indicate that the single-helix anchors with optimal embedment ratio still exhibit a relatively high uplift capacity after suffering cyclic load. The cyclic frequency has the greatest influence on the accumulated displacement, and the influence of amplitude is relatively greater than that of the mean cyclic load. The anchors in dense sand exhibit better performance to resist pullout than those in medium–dense sand under the same cyclic parameter ratios. Moreover, the correlation of post-cyclic uplift capacity and displacement after cyclic loading as well as the possible influence of the upward displacement on the sand flow above the helix are discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Behavior of Single-Helix Anchor in Sand Subjected to Uplift Cyclic Loading

Hao

Che

Chen

et al. 2022

JMSE

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“…Lutenegger [9] found that the stiffness and uplift capacity could be increased with the installation of the grouted shaft. Sharnouby and Naggar [14,15] introduced a modified HPM with a Fibre-Reinforced Plastic (FRP) casing surrounding the grouted column, namely FRP-RHPM. Sharnouby and Naggar [14] found that the ultimate capacity of axial static application of FRP-RHPM could be underestimated by the conventional design method, such as FHWA-NHI [16].…”

Section: Introductionmentioning

confidence: 99%

Parametric Study of Uplifting Capacity of Pressure Grouted Helical Anchor in Marine Clay

Lin

Zheng²,

Qin

et al. 2022

Advances in Transdisciplinary Engineering

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The pressure grouted helical anchor is an innovative soil-cement helical anchor using the simultaneous drilling and pressure grouting technique. This paper presents a field study and numerical simulation to analyze the load-displacement behavior of single pressure grouted helical anchor anchored in marine soft soil deposit. Three full-scale anchors were tested under monotonic tension loading to analysis the effect of the Influence of helix plates configuration on lifting capacity. A symmetric three-dimension finite element method (3-D FEM) model was created and calibrated based on the site investigation and the field test data. The calibrated 3-D FEM model was utilized to examine the failure criterion of the pressure grouted helical anchors according to the load diffusion mechanism and the anchor resistance profile. A parametric study was conducted to propose an equation for estimating the uplift capacity of the pressure grouted helical anchors. The outcome of the research will lead to the development of design guidelines for the uplift capacity of the pressure grouted helical anchors in clay.

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“…For the sand-pile interface friction, Sakr et al and Pando et al [10,25] reported that the interface shear behavior was largely affected by the interface hardness and friction angle. El Sharnouby and El Naggar [26] found that the composite sheet piles, subjected to axial one-way cyclic and monotonic loads, maintained or increased their stiffness and bearing capacity. Yuan et al and Dutta and Vaidya [27,28] investigated the impact of long-term freeze-thaw cycles on FRP composite sheet piles.…”

Section: Introductionmentioning

confidence: 99%

Vertical and Lateral Bearing Capacity of FRP Composite Sheet Piles in Soft Soil

Wang

Shu-wei

Weng

et al. 2020

Advances in Civil Engineering

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Fiber-reinforced polymer (FRP) composite sheet piles are usually favored for slope and river-retaining structures due to their construction and environmental efficiency. Their applications, however, have been hindered by the lack of understanding of the bearing capacity. This paper studies the vertical and lateral bearing capacity of FRP composite sheet piles through three full-scale tests conducted in Haiyan, a soft soil site in the Yangtze River Delta of China. In the three tests, we measured the vertical bearing capacity of the FRP composite sheet piles, the bearing capacity of the composite foundation, and the lateral capacity of the FRP composite sheet piles, respectively. The test results show that the Q-S (load on the top of the pile versus settlement) curve of the FRP composite sheet piles exhibits a steep fall while that of the composite foundation is relatively flat. Moreover, the ultimate bearing capacity of the FRP composite sheet piles is measured to reach 23.8 kN while that of the composite foundation increases by 47.1 %, reaching 35.0 kN. It shows that the FRP composite sheet piles under the composite foundation have a favorable bearing performance. Finally, the final horizontal displacement of the FRP composite sheet pile in the reinforced area with anchoring the sheet pile is smaller than the final horizontal displacement in the nonreinforced area, indicating that the horizontal bearing capacity can be significantly improved by anchoring the sheet pile.

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Axial monotonic and cyclic performance of fibre-reinforced polymer (FRP) – steel fibre–reinforced helical pulldown micropiles (FRP-RHPM)

Cited by 18 publications

References 11 publications

Experimental Investigation on Behavior of Single-Helix Anchor in Sand Subjected to Uplift Cyclic Loading

Experimental Investigation on Behavior of Single-Helix Anchor in Sand Subjected to Uplift Cyclic Loading

Parametric Study of Uplifting Capacity of Pressure Grouted Helical Anchor in Marine Clay

Vertical and Lateral Bearing Capacity of FRP Composite Sheet Piles in Soft Soil

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