Seismic Response Characteristics of a Piled Raft in Clay
17 Apr 2019-Journal of Earthquake and Tsunami (World Scientific Publishing Company)-Vol. 13, Iss: 01, pp 1950005
TL;DR: In this paper, the authors presented a study on three-dimensional seismic soil-structure interaction analysis of a piled-raft (PR) foundation in clay by the substructure approach.
Abstract: This paper presents a study on three-dimensional seismic soil–structure interaction analysis of a piled-raft (PR) foundation in clay by the substructure approach. Two different pile modeling techni...
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TL;DR: A substructuring method-based soil structure interaction (SSI) analysis model is employed to study vertical and horizontal dynamic impedances of piled rafts (PR) in homogeneous and layered soil conditions.
22 citations
TL;DR: In this paper, the authors investigated the seismic behavior of piled raft foundation supporting structural system embedded in very soft clay encompassing variations of different influential parameters, such as flexibility of raft, pile spacing to diameter ratios, and asymmetry in pile length.
13 citations
TL;DR: In this article, a new seismic design guideline for asymmetric single and multi-storied structure supported on combined piled raft foundations (CPRF) embedded in soft clay is proposed.
8 citations
TL;DR: In this article, the authors discuss the need to construct tunnels within the vicinity of high-rise buildings supported on piled raft foundations, as a consequence, ground movements must be taken into account.
Abstract: Across the globe, rapid urbanization demands the construction of tunnels within the vicinity of high-rise buildings supported on piled raft foundations. As a consequence, ground movements ...
7 citations
TL;DR: In this paper , a series of shaking table tests, including vertical and nonvertical configurations, were conducted, and the effects of superstructure frequency and pile angle on the seismic performance of the models were examined under a wide range of accelerations (0.2 − 0.7 g).
Abstract: The performance of batter-piled raft systems during seismic events continues to be a major concern. In response, a series of shaking table tests, including vertical and nonvertical configurations, were conducted, and the effects of superstructure frequency and pile angle on the seismic performance of the models were examined under a wide range of accelerations (0.2–0.7 g). Smaller bending moments, horizontal displacements, and rotations were captured for the nonvertical models, so the application of batter piles is reliable under seismic conditions. The maximum bending moment in the vertical models was recorded to be 8 times greater than in the batter piles at the lowest level of ground motion. Thus, the performance of the system was more sensitive to the frequency of the superstructure for vertical piles.
3 citations
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TL;DR: In this article, a quasi-three-dimensional finite element method of analysis is proposed for the dynamic response analysis of pile foundations that is computationally feasible for practical applications and is presented for an elastic response so that it can be validated against existing more exact elastic solutions and lowamplitude field vibration tests.
Abstract: A quasi-three-dimensional finite element method of analysis is proposed for the dynamic response analysis of pile foundations that is computationally feasible for practical applications. The method uses a simplified three-dimensional wave equation for describing the dynamic response of the soil. The response of the pile foundation is computed directly without having to use pile-soil-pile interaction factors. The quasi-three-dimensional solution greatly reduces the computational time for the direct analysis of pile groups. The method is presented here for an elastic response so that itcan be validated against existing more exact elastic solutions and low-amplitude field vibration tests. The method is extended to nonlinear dynamicresponse analysis in an accompanying paper. (A)
76 citations
TL;DR: In this article, the authors investigated the behavior of the combined pile-raft foundation (CPRF) with the use of centrifuge testing and a numerical model under pseudostatic and dynamic loading conditions carried out with finite-element software.
Abstract: The combined pile–raft foundation (CPRF) has been widely recognized as economic and rational foundation for high-rise buildings when subjected to vertical loading because of its effectiveness in load sharing by both raft and pile components. This results in smaller total and differential settlements with a reduced number of piles as compared with group piles. Until recently, the behavior of CPRF when subjected to lateral and real earthquake loading conditions in addition to vertical loads has not been well understood as a result of the complexities involved in the interaction of the pile, soil, and raft under such loading considerations. In the present study, an attempt has been made to investigate the behavior of CPRF with the use of centrifuge testing and a numerical model under pseudostatic and dynamic loading conditions carried out with finite-element software. After successful validation of the present CPRF model with both centrifuge and numerical model results, the same model was used for fu...
71 citations
TL;DR: The static and seismic behavior of a piled raft foundation, supporting a 12-story base-isolated building in Tokyo, is investigated by monitoring the soil-foundation-structure system as mentioned in this paper.
65 citations
TL;DR: In this article, the authors examined seismic effects on fixed-head, endbearing piles installed through soft clay, using centrifuge and numerical modelling, and established a framework for estimating earthquake-induced bending moments in fixed head piles, which takes into account superstructural mass, ground motion and, in an approximate way, nonlinear stress-strain behaviour.
Abstract: This paper examines seismic effects on fixed-head, end-bearing piles installed through soft clay, using centrifuge and numerical modelling. The numerical analyses were conducted using a non-linear hysteretic, stiffness-degrading model for the clay and were validated using centrifuge data. Numerical analyses were used to extend the range of soil, pile and ground motion parameters which could not be studied in the centrifuge. Based on the centrifuge and numerical results, a framework for estimating earthquake-induced bending moments in fixed-head piles was established, which takes into account superstructural mass, ground motion and, in an approximate way, non-linear stress–strain behaviour. In this framework, pile response is sub-divided into two kinds, namely, ‘stiff' and ‘flexible', based on the notion of an active length over which significant bending moment is developed. A relationship for the active length is developed based on regression of the centrifuge and numerical data. If the pile length is sho...
49 citations