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- W2343699056 abstract "Pile foundations have various kinds of applications in both onshore and offshoreenvironments. The use of large-diameter piles with smaller length-to-diameter ratioinstalled in both sand and clay in offshore environments has increased significantly in lastfew decades. This thesis concentrates on the numerical modeling of large diameter suctioncaisson and monopile foundation systems installed in dense sand subjected to obliquepullout and eccentric lateral loading, respectively.In the first part of this thesis, three-dimensional finite element (FE) analyses have beenperformed to evaluate the inclined loading pullout capacity of suction caisson in densesand. The numerical issues due to mesh distortion at large displacement have been reducedby the use of Arbitrary Lagrangian Eulerian (ALE) method offered by the commerciallyavailable Abaqus/Explicit FE software. The first set of the analyses has been conductedusing the built-in Mohr-Coulomb (MC) soil model in Abaqus; however, it is unable toaddress the post-peak softening behavior of dense sand. In the next set, a modified form ofMohr-Coulomb (MMC) model has been employed by the aid of user-subroutine to capturethe pre-peak hardening and post-peak softening behavior of dense sand. FE analyses resultsare compared with the centrifuge test results available in literature. The MMC model hasbeen found to simulate better the soil behavior around the caisson.In the second part of the thesis, FE analyses have been performed to estimate the lateral load-carrying capacity of large diameter monopile in dense sand for different loadeccentricities. The above mentioned MMC model has been employed in the simulations.The simulation results are compared with available centrifuge test results and a good matchhas been found. A parametric study has also been performed and a simplified method toestimate the capacity of monopile has been proposed. Analyses have also been conductedwith the MC model. The comparison between the results obtained with the MMC and theMC models have been presented. The response of soil surrounding the monopile duringloading is also examined." @default.
- W2343699056 created "2016-06-24" @default.
- W2343699056 creator A5057894126 @default.
- W2343699056 date "2015-08-01" @default.
- W2343699056 modified "2023-09-24" @default.
- W2343699056 title "Finite element modeling of suction caisson and large diameter monopile in dense sand under oblique and lateral load" @default.
- W2343699056 hasPublicationYear "2015" @default.
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