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Nonlinear Dynamic Soil-Micropile-Structure Interactions: Centrifuge Tests and FEM Analyses
Micropiles are grouted and small diameter piles that are often used in foundation retrofit. Experimental evidences have indicated that micropiles behave well under seismic loading due to their high flexibility. Moreover, observations in the 1995 Kobe Earthquake indicate a good performance of friction piles under seismic loading. However, the seismic behavior of micropiles is not fully understood due to the limited number of full and model-scale tests, as well as the limited amount of numerical modeling studies for micropiles. This paper focuses on Finite Element modeling of single and micropile groups under both static and dynamic loading. The micropile/soil interface was modeled either with perfect bonding or with frictional interface elements. The lateral vertical boundaries of the soil were set up in such a way that the reflection of the arrival waves at the boundaries was avoided. The problem includes soil non-linearity, gapping and slippage between the micropile and the soil, complex boundary conditions and possible pile non-linearity. The structure is described by a single degree of freedom system composed of a concentrated mass and a column. The results of this study show the influence of micropiles inclination on dynamic amplification and on the seismic-induced internal forces in micropiles.
Nonlinear Dynamic Soil-Micropile-Structure Interactions: Centrifuge Tests and FEM Analyses
Micropiles are grouted and small diameter piles that are often used in foundation retrofit. Experimental evidences have indicated that micropiles behave well under seismic loading due to their high flexibility. Moreover, observations in the 1995 Kobe Earthquake indicate a good performance of friction piles under seismic loading. However, the seismic behavior of micropiles is not fully understood due to the limited number of full and model-scale tests, as well as the limited amount of numerical modeling studies for micropiles. This paper focuses on Finite Element modeling of single and micropile groups under both static and dynamic loading. The micropile/soil interface was modeled either with perfect bonding or with frictional interface elements. The lateral vertical boundaries of the soil were set up in such a way that the reflection of the arrival waves at the boundaries was avoided. The problem includes soil non-linearity, gapping and slippage between the micropile and the soil, complex boundary conditions and possible pile non-linearity. The structure is described by a single degree of freedom system composed of a concentrated mass and a column. The results of this study show the influence of micropiles inclination on dynamic amplification and on the seismic-induced internal forces in micropiles.
Nonlinear Dynamic Soil-Micropile-Structure Interactions: Centrifuge Tests and FEM Analyses
Mahboubi, Ahmad (Autor:in) / Nazari-Mehr, Ali (Autor:in)
GeoShanghai International Conference 2010 ; 2010 ; Shanghai, China
14.05.2010
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Nonlinear Dynamic Soil-Micropile-Structure Interactions: Centrifuge Tests and FEM Analyses
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