Estimation of axial stiffness on existing and reinforcing piles in vertical extension remodeled buildings

Kim, Do-Hyun; Kim, Jae Hong; Jeong, Sangseom

doi:10.1016/j.engstruct.2019.109466

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…En un caso especial de simulación de reforzamiento de fundaciones con micropilotes en túneles [44], se realizaron 13 pruebas a escala en cámara con arena densa; se demostró que con la instalación de micropilotes más largos principalmente ubicados en la sección central del túnel y cerca al pilote, disminuyeron significativamente los movimientos en el suelo en aproximadamente 86 %, los momentos de flexión en 25 % y las fuerzas axiales en 20 % en comparación con la situación sin micropilotes. Considerando que no se tiene certeza de la capacidad total exacta de los pilotes existentes y que se requiere que soporten el aumento de la carga estructural, es fundamental diseñar e instalar los micropilotes de refuerzo teniendo en cuenta la rigidez axial de los pilotes existentes y el índice de distribución de carga [45]. Partiendo de esta premisa se propone estimar la rigidez axial de los micropilotes de refuerzo a través de un programa numérico 3D conocido como YSPR y el software Plaxis 3D, en el que se simuló una remodelación de extensión vertical.…”

Section: Esfuerzos Axialesunclassified

Inclusión de micropilotes como elementos recuperadores de carga en cimentaciones: revisión del estado del conocimiento

Guerrero

Rincón

2022

Ing.

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Contexto: Los micropilotes son utilizados como elementos de refuerzo del suelo o de recalce, dicha función es comprobada y analizada por diferentes autores. En Colombia el uso de esta técnica está limitado a conceptos propios del geotecnista que involucran conocimientos empíricos y experiencias exitosas. En consecuencia, es necesaria la compilación de variables clave y metodologías analíticas y numéricas para la mejor comprensión de esta técnica. Método: En este documento se presenta un estado del arte sustentado en artículos e investigaciones que tienen como objeto el análisis y la evaluación del comportamiento de los micropilotes como elementos recuperadores de capacidad de carga en grupos de pilotes que presentan defectos. Resultados: Los hallazgos identificados en los documentos consultados logran ser sintetizados como un soporte teórico que se convierte en un punto de partida para futuras investigaciones en este campo de la ingeniería geotécnica. Conclusiones: Se logra evidenciar que los micropilotes tienen una influencia positiva en la recuperación de carga de fundaciones existentes, demostrando la importancia de efectuar ensayos y análisis de campo directamente en Colombia, considerando los estratos de suelos específicos que se encuentran en el país.

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Section: Esfuerzos Axialesunclassified

Inclusión de micropilotes como elementos recuperadores de carga en cimentaciones: revisión del estado del conocimiento

Guerrero

Rincón

2022

Ing.

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“…However, they did not consider the influence of the soil confining stress. Kim et al (2019) estimated the axial stiffness of an underpinning pile and its influence on the load carrying capacity via numerical analysis. Jeong and Kim (2020) proposed an axial stiffness range to achieve an optimal underpinning design, considering the deterioration of the existing piles.…”

Section: Introductionmentioning

confidence: 99%

A field study on the load sharing behavior of a micropiled raft underpinned by a waveform micropile

2022

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A waveform microiple(WMP) uses jet grouting method to generate shear keys along the pile shaft for improving the shaft resistance and cost efficiency. In this study,field loading tests were performed in this study to characterize the load sharing behavior upon inclusion of a waveform micropile (WMP) in a group of four micropiled-raft. First, single-pile compressive loading tests were conducted on three WMPs and five Type A micropiles (MP). Subsequently, a group-pile loading test was performed on a piled raft comprising 2 × 2 MPs and a central WMP. The load–settlements, axial stiffnesses, and load transfer mechanisms of individual MPs were analyzed during the tests, including the short- and long-term effects of the axial stiffnesses of the MPs on the load sharing ratio of the micropiled-raft. The single-pile loading test results revealed that the shear keys along the WMPs caused its bearing capacities and axial stiffnesses to be 1.5 times and 2–5 times higher than those of MPs, respectively. In the micropiled-raft loading test, the load sharing ratios of the MPs increased with their axial stiffnesses, and the highest load sharing capacity was exhibited by the WMP, which constituted 30% of the total load and 2–3 times that of MPs. Moreover, the influence of raft on the load-sharing capacity should be considered as well.

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“…The stability provided by micropiles as support members in the floating structure method has been demonstrated through numerous construction and measurement cases. Numerical analysis was performed on the axial stiffness of micro piles during the remodeling of a building, and the degree of stiffness required to increase when deterioration occurred was analyzed [18]. Studies have been conducted on a method to improve the stability of existing buildings by creating a shear key of a waveform in a micropile [19] or sharing the support capacity [20].…”

Section: Introductionmentioning

confidence: 99%

Development of Expanded Steel Pipe Pile to Enhance Bearing Capacity

Kim

Min³

et al. 2022

Sustainability

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An expanded steel pipe pile increases the cross-sectional area of conventional micropile by expanding the steel pipe to exhibit a higher bearing capacity owing to increased frictional resistance. However, construction cases of the expanded steel pipe pile are insufficient due to the absence of equipment for expanding steel pipes inside the ground. In this study, hydraulic expansion equipment was developed to verify the reinforcing impact on the bearing capacity and field applicability of the expanded steel pipe pile. A series of laboratory and test bed experiments was conducted to measure the expansion time and deformation of carbon steel pipes by using the developed equipment. The results of these experiments demonstrated that the developed equipment has sufficient ability and constructability to be used in the field for constructing expanded steel pipe piles. Then, field load tests were performed by constructing expanded and conventional steel pipe piles to confirm the improved bearing capacity of the expanded steel pipe pile compared to that of the conventional micropile. As a result, the expanded steel pipe pile exhibited a 20.88% increase in bearing capacity compared to that of the conventional steel pipe pile.

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Estimation of axial stiffness on existing and reinforcing piles in vertical extension remodeled buildings

Cited by 10 publications

References 7 publications

Inclusión de micropilotes como elementos recuperadores de carga en cimentaciones: revisión del estado del conocimiento

Inclusión de micropilotes como elementos recuperadores de carga en cimentaciones: revisión del estado del conocimiento

A field study on the load sharing behavior of a micropiled raft underpinned by a waveform micropile

Development of Expanded Steel Pipe Pile to Enhance Bearing Capacity

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