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- W812056 abstract "This paper presents experimental results that aimed to investigate the effects of soil liquefactionon the modal parameters (i.e. frequency and damping ratio) of pile-supported structures. The testswere carried out using the shaking table facility of the Bristol Laboratory for Advanced DynamicsEngineering (BLADE) at the University of Bristol (UK) whereby four pile-supported structures (twosingle piles and two pile groups) with and without superstructure mass were tested. The experimentalinvestigation aimed to monitor the variation in natural frequency and damping of the four physicalmodels at different degrees of excess pore water pressure generation and in full-liquefaction condition.The experimental results showed that the natural frequency of pile-supported structures maydecrease considerably owing to the loss of lateral support offered by the soil to the pile. On the otherhand, the damping ratio of structure may increase to values in excess of 20%. These findings haveimportant design consequences: (a) for low-period structures, substantial reduction of spectralacceleration is expected; (b) during and after liquefaction, the response of the system may be dictatedby the interactions of multiple loadings, that is, horizontal, axial and overturning moment, which werenegligible prior to liquefaction; and (c) with the onset of liquefaction due to increased flexibility ofpile-supported structure, larger spectral displacement may be expected, which in turn may enhance Pdeltaeffects and consequently amplification of overturning moment. Practical implications for piledesign are discussed." @default.
- W812056 created "2016-06-24" @default.
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- W812056 date "2014-08-24" @default.
- W812056 modified "2023-09-23" @default.
- W812056 title "Variation of modal parameters of pile-supported structures in seismically liquefiable soils." @default.
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