Rini Kusumawardani, - Numerical Simulation and Seismic Performance of Buckling Instability of Piles in Liquefiable Ground. The 5th Asia Future Conference (AFC5), Philippines.

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Abstract

The paper discusses an alternative to compute and analyze pile buckling in liquefiable ground during seismic shaking. This study is undertaken based on three-dimensional finite element (FE) simulations using Open- SeesPL. To explore the effect of shaking, soil and pile behaviors are observed at different axial loading condi- tions. The results reveal insights of axial load influence due to soil liquefaction in both near-field and free-field grounds. Analysis results show that an increase in axial load would generally decrease the lateral displacement and increase the bending moment of piles, as well as reduce the acceleration and excess pore pressure responses in soils by seismic shaking and soil liquefaction. From the case examined in this study, we notice the computed bending moments in piles are less than that of the yielding or ultimate moment, which appear dissimilar results by using Bhattacharya’s approach that would indicate the buckling of piles under the dynamic axial loads and soil liquefaction in seismic shaking. Further studies would therefore be warranted to justify the capability and suitability of the numerical simulations conducted herein. Nonetheless, the revealed insights by numerical simulations provide a good basis for understanding and analysis on the buckling of piles in liquefiable ground.

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