Abstract
It is found through centrifuge model tests that the cyclic lateral load on a pile reduces the shaft friction and induces additional pile settlement. A theoretical model using the load-transfer method was proposed for the settlement prediction of cyclic laterally loaded piles in dry sand. A simple formula was established to quickly predict the pile settlement in practical engineering. The theoretical model provided a reasonable estimate of the pile settlement, while the predictions from the proposed quick prediction formula were relatively conservative. A new concept of ‘settlement-controlled design’ was proposed to advance the methodology for the design of a pile by considering potential settlement after many cycles of lateral loads. According to the design plane derived from this study, it was suggested that the design-state points should be limited to the convergent zone.
Highlights
Pile foundations have been widely adopted for the construction of a variety of infrastructures, such as viaducts, high-rise buildings and offshore structures (Zhang et al 2005; Kong et al 2019)
As the basic components that support superstructures, piles are inevitably subjected to cyclic lateral loads during their service lives
A theoretical model using the load-transfer method was proposed for the settlement prediction of cyclic laterally loaded in dry sand
Summary
Pile foundations have been widely adopted for the construction of a variety of infrastructures, such as viaducts, high-rise buildings and offshore structures (Zhang et al 2005; Kong et al 2019). According to Mendoza and Auvinet (1988), significant settlement mainly occurred at friction piles, whereas point-bearing (or end-bearing) piles performed much better during the earthquake This finding inspired another hypothesis that the adhesion or friction at the pile-soil interface degraded under seismic loading. To reveal the mechanism of the vertical displacements of a pile under cyclic lateral loads, a series of centrifuge model tests were conducted by Zheng et al (2021). These tests provided evidence for the transmission of the shaft friction lost on the pile tip, which caused additional pile settlement. A new concept of “settlement-controlled design” was proposed to advance the methodology for the design of a pile by considering potential settlement after many cycles of lateral loads
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