Rini Kusumawardani, - Deterministic assessment and numerical simulations of buckling instability of piles in liquefiable ground. Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering.

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Abstract

This paper discussed an alternative to compute and analyze the buckling instability of piles in a liquefiable ground during seismic loading. A key aspect of the study is a comparison of different approaches on buckling assessment of piles using deterministic and numerical method. The study discusses the assessment of buckling instability of piles due to liquefaction of foun- dation soils for a coal-fired power station (CFPS) in Indonesia. Liquefaction analysis is performed based on a SPT-NN approach and results indicate the foundation soils of study area would be prone to liquefaction due to design earthquake. Results of buckling assessment using a deterministic approach proposed by Bhattacharya show a pile buckling index (IIBB) ≥ 1.0, with an average IIBB value 5.3, indicating the pile foundation of CFPS should be safe from buckling failure due to design earthquake and soil liquefaction. The numerical simulations are undertaken based on a 3D finite element method (FEM) using OpenSeesPL. To explore the effect of shaking, soil and pile behaviors are examined due to various factors. This study sets out to gain further understanding on soil re- sponses and soil-pile behaviors during seismic excitation. For the case history examined by Bhattacharya approach, FEM results show the computed bending moments in piles (MMNN) are less than the ultimate bending moments of piles (MMDD) due to design earth- quake and soil foundation. Accordingly, both deterministic and numerical approaches confirm the piles would be safe from buckling failure against soil liquefaction during seismic loading for the CFPS foundation examined.

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