TY - JOUR A1 - Anic, Filip A1 - Penava, Davorin A1 - Sarhosis, Vasilis A1 - Abrahamczyk, Lars T1 - Development and Calibration of a 3D Micromodel for Evaluation of Masonry Infilled RC Frame Structural Vulnerability to Earthquakes JF - Geosciences N2 - Within the scope of literature, the influence of openings within the infill walls that are bounded by a reinforced concrete frame and excited by seismic drift forces in both in- and out-of-plane direction is still uncharted. Therefore, a 3D micromodel was developed and calibrated thereafter, to gain more insight in the topic. The micromodels were calibrated against their equivalent physical test specimens of in-plane, out-of-plane drift driven tests on frames with and without infill walls and openings, as well as out-of-plane bend test of masonry walls. Micromodels were rectified based on their behavior and damage states. As a result of the calibration process, it was found that micromodels were sensitive and insensitive to various parameters, regarding the model’s behavior and computational stability. It was found that, even within the same material model, some parameters had more effects when attributed to concrete rather than on masonry. Generally, the in-plane behavior of infilled frames was found to be largely governed by the interface material model. The out-of-plane masonry wall simulations were governed by the tensile strength of both the interface and masonry material model. Yet, the out-of-plane drift driven test was governed by the concrete material properties. KW - Verwundbarkeit KW - Ausfachung KW - Stahlbeton KW - RC frames KW - unreinforced masonry infill walls KW - openings KW - structural vulnerability KW - out-of-plane seismic load KW - OA-Publikationsfonds2021 Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20211202-45370 UR - https://www.mdpi.com/2076-3263/11/11/468 VL - 2021 IS - Voume 11, issue 11, article 468 PB - MDPI CY - Basel ER - TY - JOUR A1 - Staubach, Patrick A1 - Machacek, Jan A1 - Skowronek, Josefine A1 - Wichtmann, Torsten T1 - Vibratory pile driving in water-saturated sand: Back-analysis of model tests using a hydro-mechanically coupled CEL method JF - Soils and Foundations N2 - The development of a hydro-mechanically coupled Coupled-Eulerian–Lagrangian (CEL) method and its application to the back-analysisof vibratory pile driving model tests in water-saturated sand is presented. The predicted pile penetration using this approachis in good agreement with the results of the model tests as well as with fully Lagrangian simulations. In terms of pore water pressure, however, the results of the CEL simulation show a slightly worse accordance with the model tests compared to the Lagrangian simulation. Some shortcomings of the hydro-mechanically coupled CEL method in case of frictional contact problems and pore fluids with high bulk modulus are discussed. Lastly, the CEL method is applied to the simulation of vibratory driving of open-profile piles under partially drained conditions to study installation-induced changes in the soil state. It is concluded that the proposed method is capable of realistically reproducing the most important mechanisms in the soil during the driving process despite its addressed shortcomings. KW - Plastische Deformation KW - Vibratory pile driving KW - Coupled-Eulerian–Lagrangian KW - Hydro-mechanically coupled KW - Hypoplasticity KW - Relative acceleration KW - Large deformation KW - Deformationsverhalten KW - Plastizität KW - OA-Publikationsfonds2020 Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20210203-43571 UR - https://www.sciencedirect.com/science/article/pii/S0038080620337586?via%3Dihub VL - 2021 IS - Volume 61, Issue 1 SP - 144 EP - 159 PB - Elsevier, Science Direct CY - Amsterdam ER -