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Field axial cyclic loading tests of screw micropiles in cohesionless soil
https://orcid.org/0000-0002-2083-8244
Abstract Screw micropile is a new type of steel pipe pile that consists of a smooth, threaded segment and a tapered segment. It is installed using the torque method. To examine the axial cyclic behavior of the piles, six one-way compressive and load-controlled axial cyclic tests were performed at a sandpit site. The axial cyclic load, with 15 cycles and an equivalent peak vertical acceleration ranging from 0.4 g to 0.6 g, was meant to replicate the vertical motion of an earthquake load. In-situ geotechnical investigation and lab testing were undertaken to determine the soil stratigraphy and properties. Three of the piles were instrumented with strain gauge to measure the unit shaft distribution. The pile-head cumulative displacement, stiffness and equivalent damping ratios were obtained. The effect of initial factor of safety on the cyclic behavior was examined. The re-distribution of unit shaft resistance of individual segments was obtained. Segment equivalent damping ratio and stiffness of the unit shaft resistance hysteresis were determined. The contribution of each pile segment to global pile behavior was delineated.
Highlights Presented six axial cyclic loading tests of screw micropiles subjected to pseudo-static one-way cyclic load. Piles reached serviceability limit state by accumulating an excessive cumulative displacement. The loading stiffness increased with the number of cycles; unloading stiffness remained steady. Equivalent damping ratios remained unchanged. The contribution of pile segments to global pile behavior was assessed.
Field axial cyclic loading tests of screw micropiles in cohesionless soil
https://orcid.org/0000-0002-2083-8244
Abstract Screw micropile is a new type of steel pipe pile that consists of a smooth, threaded segment and a tapered segment. It is installed using the torque method. To examine the axial cyclic behavior of the piles, six one-way compressive and load-controlled axial cyclic tests were performed at a sandpit site. The axial cyclic load, with 15 cycles and an equivalent peak vertical acceleration ranging from 0.4 g to 0.6 g, was meant to replicate the vertical motion of an earthquake load. In-situ geotechnical investigation and lab testing were undertaken to determine the soil stratigraphy and properties. Three of the piles were instrumented with strain gauge to measure the unit shaft distribution. The pile-head cumulative displacement, stiffness and equivalent damping ratios were obtained. The effect of initial factor of safety on the cyclic behavior was examined. The re-distribution of unit shaft resistance of individual segments was obtained. Segment equivalent damping ratio and stiffness of the unit shaft resistance hysteresis were determined. The contribution of each pile segment to global pile behavior was delineated.
Highlights Presented six axial cyclic loading tests of screw micropiles subjected to pseudo-static one-way cyclic load. Piles reached serviceability limit state by accumulating an excessive cumulative displacement. The loading stiffness increased with the number of cycles; unloading stiffness remained steady. Equivalent damping ratios remained unchanged. The contribution of pile segments to global pile behavior was assessed.
Field axial cyclic loading tests of screw micropiles in cohesionless soil
https://orcid.org/0000-0002-2083-8244
Abstract Screw micropile is a new type of steel pipe pile that consists of a smooth, threaded segment and a tapered segment. It is installed using the torque method. To examine the axial cyclic behavior of the piles, six one-way compressive and load-controlled axial cyclic tests were performed at a sandpit site. The axial cyclic load, with 15 cycles and an equivalent peak vertical acceleration ranging from 0.4 g to 0.6 g, was meant to replicate the vertical motion of an earthquake load. In-situ geotechnical investigation and lab testing were undertaken to determine the soil stratigraphy and properties. Three of the piles were instrumented with strain gauge to measure the unit shaft distribution. The pile-head cumulative displacement, stiffness and equivalent damping ratios were obtained. The effect of initial factor of safety on the cyclic behavior was examined. The re-distribution of unit shaft resistance of individual segments was obtained. Segment equivalent damping ratio and stiffness of the unit shaft resistance hysteresis were determined. The contribution of each pile segment to global pile behavior was delineated.
Highlights Presented six axial cyclic loading tests of screw micropiles subjected to pseudo-static one-way cyclic load. Piles reached serviceability limit state by accumulating an excessive cumulative displacement. The loading stiffness increased with the number of cycles; unloading stiffness remained steady. Equivalent damping ratios remained unchanged. The contribution of pile segments to global pile behavior was assessed.
Field axial cyclic loading tests of screw micropiles in cohesionless soil
Khidri, Mujtaba (author) / Deng, Lijun (author)
2021-01-13
Article (Journal)
Electronic Resource
English
Field Tests on Screw Micropiles Under Axial Loading
| Springer Verlag | 2019
Field loading tests of screw micropiles under axial cyclic and monotonic loads
| Online Contents | 2018
Field loading tests of screw micropiles under axial cyclic and monotonic loads
| Springer Verlag | 2018
Field loading tests of screw micropiles under axial cyclic and monotonic loads
| Springer Verlag | 2019