Yannis Chaloulos, Amalia Giannakou, Vasileios Drosos, Panagiota Tasiopoulou, Jacob Chacko and Sjoerd de Wit have co-authored a paper titled: “Liquefaction-Induced Settlements of Residential Buildings subjected to Induced Earthquakes” which will be soon be published in Soil Dynamics and Earthquake Engineering. The paper evaluates the dynamic performance of existing residential houses affected by gas-extraction-induced earthquakes in an area of low tectonic seismicity where structures have not been designed against earthquake loading. Nonlinear, effective stress, fully coupled, dynamic soil-structure interaction analyses were performed to develop estimates of liquefaction-induced settlements for buildings on narrow spread footings covering a range of soil conditions, ground motions and structural characteristics that are typically encountered in the study area. A simplified equation was developed from regression of the numerical analyses results to derive estimates of liquefaction-induced settlements for residential buildings that was adopted in the latest update of the relevant seismic building code. The paper has been accepted and is under production. Stay tuned!
- Sep 18, 2019
- 1 min read
Updated: Nov 18, 2019
Panagiota Tasiopoulou, Katerina Ziotopoulou, Francisco Humire, Amalia Giannakou, Jacob Chacko and Thaleia Travasarou have co-authored a paper titled: “Development and Implementation of Semiempirical Framework for Modeling Postliquefaction Shear Deformation Accumulation in Sands” which is available online in Journal of Geotechnical and Geoenvironmental Engineering, ASCE. The paper presents a framework for the estimation of coseismic deformations in the postliquefaction regime developed based on an extensive database of available cyclic undrained stress-controlled tests on clean sand samples without static shear bias, covering a wide range of relative densities. The proposed framework provides a basis for the calibration of advanced constitutive models capable of capturing postliquefaction strain accumulation. A calibration methodology is proposed using both existing liquefaction resistance curves and the newly developed semiempirical relationships for estimating postliquefaction shear strain accumulation.
- Sep 18, 2019
- 1 min read
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.