Panagiota Tasiopoulou, Yannis Chaloulos, Nikos Gerolymos, Amalia Giannakou and Jacob Chacko have co-authored two papers, introducing the implemented version of Ta-Ger multiaxial constitutive model for sand in FLAC and FLAC3D. The first paper, titled “3D and 2D simulations of liquefaction-induced settlements of shallow foundations using Ta-Ger model” and published in the Proceedings of the 7th International Conference on Geotechnical Earthquake Engineering held in Rome, Italy (2019), focuses on liquefaction-induced settlements, including validation against a centrifuge test which investigates the settlement of a building founded on a footing due to liquefaction. The second paper, titled “Numerical Study of the Cyclic Response of Bucket Foundations in Sand using Ta-Ger Model” and published in the Proceedings of the 2nd International Conference on Natural Hazards and Infrastructure held in Chania, Greece, investigates the performance of bucket foundations in sand used for offshore wind turbines, under wave loading and different drainage conditions.

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From paper “3D and 2D simulations of liquefaction-induced settlements of shallow foundations using Ta-Ger model”

From paper “Numerical Study of the Cyclic Response of Bucket Foundations in Sand using Ta-Ger Model”

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Updated: Oct 7, 2019

Vasileios Drosos, Amalia Giannakou, Jacob Chacko, A. Papageorgiou and Sjoerd de Wit have co-authored a paper titled “Investigation of Post-Failure Axial Capacity of Lightly Reinforced Concrete Piles” and published in the Proceedings of the 7th International Conference on Geotechnical Earthquake Engineering in Rome. The paper presents a methodology developed to answer whether a pile whose shear structural capacity has been exceeded is still able to carry the vertical loads of the superstructure following an earthquake. This proposed methodology hinges on the observation that axial capacity of shear-failed columns does not initiate until the structural member loses all of its shear capacity and can be useful for the preliminary seismic evaluation of poorly reinforced pile foundations. Analysis of a case-study from northern Europe using the proposed methodology have shown that piles can bear vertical loads even after shear failure has initiated, as long as the imposed drifts on the pile are less than a critical value. For most of the cases analyzed, the pile fails in shear, but it seems that it can continue bearing the vertical loads. This finding is likely to have a significant influence on the design of retrofit approaches.

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Amalia Giannakou, Panagiota Tasiopoulou, Jacob Chacko and Hobi Kim have co-authored a paper, published in the Proceedings of the 7th International Conference on Geotechnical Earthquake Engineering in Rome, discussing the method adopted to evaluate lateral spreading induced demands on the 1915 Ҫanakkale Bridge Tower. The 1915 Ҫanakkale Bridge, spanning the Ҫanakkale Straits and located near the western end of the Sea of Marmara in Turkey between Gelibolu (northeast) and Lapseki (southwest), will be the world’s longest suspension bridge with a main span of 2,023 m and a total length of 3,563 m. The proposed bridge is located ~20 km from the North Anatolian Fault, a plate boundary between the Anatolian and the Eurasian plate, and, as such, has the potential to experience significant earthquakes. The adopted method involved nonlinear, effective-stress, fully coupled dynamic soil-structure interaction analyses.

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