@article{ulker_2024, title={Cyclic response of granular soils evaluated through a strain hardening model incorporated into the generalized plasticity framework}, ISSN={["1939-7879"]}, DOI={10.1080/19386362.2024.2338315}, abstractNote={In this study, constitutive behavior of granular soils is modeled through a generalized plasticity-based theoretical framework. The soil hardening is addressed by a novel relationship proposed to calculate plastic strains and their evolution during loading history. The model is effective in predicting the response and incorporating it into a numerical scheme. Focus is given to stress ratios yielding liquefaction in a few stress cycles. The proposed hardening law is based upon a combined deviatoric-volumetric hardening rule updating the stress-strain relationship and plastic strain vector. Numerous undrained monotonic and cyclic triaxial tests are simulated for verification of the constitutive formulation. Results indicate that the developed model for sand-like cohesionless soils proves to match fairly well with the available experimental data. Plastic strains are calculated accurately and accumulated pore pressures are well captured. Triaxial test simulations exhibit a successfully improved way of capturing the essential static and cyclic behavior of granular soils.}, journal={INTERNATIONAL JOURNAL OF GEOTECHNICAL ENGINEERING}, author={Ulker, M. B. Can}, year={2024}, month={Apr} }
 @article{celik_ulker_gocer_guntepe_koz_eyupgiller_aksu_yaz_2024, title={Multidisciplinary reconnaissance investigation covering structural, geotechnical, and architectural based damage to mid-rise residential buildings following the February 6th, 2023 Kahramanmaras,, Türkiye earthquake doublets (Mw 7.8, Mw 7.6)}, volume={182}, ISSN={["1879-341X"]}, DOI={10.1016/j.soildyn.2024.108738}, abstractNote={Kahramanmaraş and its surroundings were devastated with major earthquake doublets of Mw = 7.8 Pazarcık and Mw = 7.6 Elbistan/Ekinözü on February 6th, 2023. While a wide scatter of reinforced concrete (RC) structures experienced damage, mid-rise residential buildings constitute a large bulk with heavy damage or total collapse. Among many reasons, poor concrete strength and brittle fracture of rebars along with liquefaction-caused soil deformations contributed to building damage. This paper investigates structural, geotechnical, and architectural conditions of mid-rise RC residential buildings with heavy damage. The geotechnical component includes the investigation of liquefaction-caused settlement and subsidence of loose foundation soils. Architectural reconnaissance suggests that commonly encountered design mistakes observed in past earthquakes were repeated. Field investigation concludes that loose saturated silty and sandy soils exhibit liquefaction leading to permanent damage on the mid-rise buildings while tunnel-form code-designed RC buildings with seven-to-ten stories performed well.}, journal={SOIL DYNAMICS AND EARTHQUAKE ENGINEERING}, author={Celik, Oguz C. and Ulker, Mehmet Baris Can and Gocer, Caner and Guntepe, Sinem and Koz, Oguz and Eyupgiller, Mustafa Mert and Aksu, Mert and Yaz, Ali}, year={2024}, month={Jul} }
 @article{ulker_rahman_2009, title={Response of saturated and nearly saturated porous media: Different formulations and their applicability}, volume={33}, ISSN={["1096-9853"]}, DOI={10.1002/nag.739}, abstractNote={Abstract}, number={5}, journal={INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS}, author={Ulker, M. B. C. and Rahman, M. S.}, year={2009}, month={Apr}, pages={633–664} }