Person: Calderón Uriszar-Aldaca, Íñigo
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Calderón Uriszar-Aldaca
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Íñigo
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Ingeniería
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0000-0002-6911-161X
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811725
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Publication Open Access Parametric modelling of 3D printed concrete segmented beams with rebars under bending moments(Elsevier, 2023) Aramburu, Amaia; Calderón Uriszar-Aldaca, Íñigo; Puente, I.; Ingeniería; Ingeniaritza3D concrete printing is gaining relevance as a technology for the manufacture of lightweight components and complex freeform shells. Nevertheless, the insertion of reinforcing elements to withstand tensile stress, the fabrication of large structures, and the insertion of joints between different segments are some targets that are still to be addressed for its full development. A new method which also includes a novel parametric model is presented in this study to simulate the performance of 3DPC reinforced segmented beams subjected to 3-point bending tests. In addition to the geometry of the complete beam, the beam segments, different materials, and the rebar, which were considered in previous works, the material age and the interface between segments and rebar-concrete adhesion are also considered in the new method. The method is complemented by a new set of programmed routines that connect commercial design and finite element calculation programs, requiring only one user interaction with an initial routine to generate the estimated performance of a component in a 3-point flexural test in a given set of cases. Finally, the method was validated through direct comparisons with experimental tests.Publication Open Access Size effects in finite element modelling of 3D printed bone scaffolds using hydroxyapatite PEOT/PBT composites(MDPI, 2021) Calderón Uriszar-Aldaca, Íñigo; Pérez, Sergio; Sinha, Ravi; Cámara Torres, María; Villanueva, Sara; Mota, Carlos; Patelli, Alessandro; Matanza, Amaia; Moroni, Lorenzo; Sánchez, Alberto; Ingeniería; IngeniaritzaAdditive manufacturing (AM) of scaffolds enables the fabrication of customized patient-specific implants for tissue regeneration. Scaffold customization does not involve only the mac-roscale shape of the final implant, but also their microscopic pore geometry and material properties, which are dependent on optimizable topology. A good match between the experimental data of AM scaffolds and the models is obtained when there is just a few millimetres at least in one direction. Here, we describe a methodology to perform finite element modelling on AM scaffolds for bone tissue regeneration with clinically relevant dimensions (i.e., volume > 1 cm3). The simulation used an equivalent cubic eight node finite elements mesh, and the materials properties were derived both empirically and numerically, from bulk material direct testing and simulated tests on scaffolds. The experimental validation was performed using poly(ethylene oxide terephthalate)-poly(butylene ter-ephthalate) (PEOT/PBT) copolymers and 45 wt% nano hydroxyapatite fillers composites. By applying this methodology on three separate scaffold architectures with volumes larger than 1 cm3, the simulations overestimated the scaffold performance, resulting in 150–290% stiffer than average values obtained in the validation tests. The results mismatch highlighted the relevance of the lack of printing accuracy that is characteristic of the additive manufacturing process. Accordingly, a sensi-tivity analysis was performed on nine detected uncertainty sources, studying their influence. After the definition of acceptable execution tolerances and reliability levels, a design factor was defined to calibrate the methodology under expectable and conservative scenarios.Publication Open Access Novel method for an optimised calculation of the cross-sectional distribution of live loads on girder bridge decks(Czech Technical University, 2022) Gaute-Alonso, Álvaro; Garcia Sánchez, David; Calderón Uriszar-Aldaca, Íñigo; Lopez Castillo, Claudio; Ingeniería; IngeniaritzaOne of the main goals in the design of girder bridge deck systems is to determine the cross-sectional distribution of live loads across the different girders that make up the cross-section of the deck. Structural grillage models and current bridge design standards based on a Load Distribution Factor (LDF) provide oversized designs, as demonstrated in this paper. This research introduces a novel method that allows the cross-sectional distribution of live loads on girder bridge decks to be calculated by applying a matrix formulation that reduces the structural problem to 2 degrees of freedom for each girder: the deflection and the rotation of the deck-slab at the centre of the girder's span. Subsequently, a parametric study is presented that analyses the structural response of 64 girder bridge decks to a total of 384 load states. In addition, the authors compare the outputs of the novel method with those obtained using traditional grillage calculation methods. Finally, the method is experimentally validated on two levels: a) a laboratory test that analyses the structural response of a small-scale girder bridge deck to the application of different load states; b) a real full-scale girder bridge load test that analyses the structural response of the bridge over the Barbate River during its static load test. Based on this analysis, the maximum divergence of the proposed method obtained from the experimental structural response is less than 10%. The use of the proposed novel analysis method undoubtedly provides significant savings in material resources and computing time, while contributing to minimizing overall costs.