Publicacións

@article{cid_reliability_2023,

title = {Reliability index based strategy for the probability-damage approach in fail-safe design optimization (β-PDFSO)},

author = {Clara Cid and Aitor Baldomir-García and Santiago Hernández-Ibáñez},

url = {https://doi.org/10.1007/s00366-022-01611-y},

doi = {10.1007/s00366-022-01611-y},

issn = {1435-5663},

year  = {2023},

date = {2023-06-01},

urldate = {2026-08-07},

journal = {Engineering with Computers},

volume = {39},

number = {3},

pages = {2125–2146},

abstract = {This research proposes a new formulation for fail-safe size optimization, considering the probability of occurrence of each failure scenario and the random structural parameters as sources of uncertainty. Essentially, the fail-safe reliability-based design optimization is reformulated, where the term “damaged structure” coalesces information of the whole set of damaged configurations. Thus, a single random reliability index is defined, representing the reliability of a limit-state of the damaged structure, which accounts for the safety level of the entire set of damaged configurations. The method provides the optimum design for which the reliability indices of the damaged structure are achieved at the confidence level the designer demands. The first application example corresponds to an academic analytical problem. The second and third application examples correspond to practical engineering cases: a 2D truss structure with stress constraints as well as the tail section of an aircraft fuselage with stress and buckling constraints. Results show a considerable reduction of the objective function compared to the fail-safe RBDO, which could lead to oversized designs. In this sense, mass savings up to 13.6% are achieved for the industrial-like application example.},

keywords = {Fail-safe, Failure scenario, Multi-model, Partial collapse, Reliability, Uncertainty},

pubstate = {published},

tppubtype = {article}

}

@article{soto_fail-safe_2023,

title = {Fail-safe optimum cable system under cable breakage in cable-stayed bridges. Application to the Queensferry Crossing Bridge},

author = {Noel Soto and Clara Cid and Aitor Baldomir-García and Santiago Hernández-Ibáñez},

url = {https://www.sciencedirect.com/science/article/pii/S0141029622016339},

doi = {10.1016/j.engstruct.2022.115557},

issn = {0141-0296},

year  = {2023},

date = {2023-03-01},

urldate = {2026-08-13},

journal = {Engineering Structures},

volume = {279},

pages = {115557},

abstract = {This paper presents a methodology to optimize the cable system in cable-stayed bridges, whose main novelty is to take into account the accidental breakage of one cable within the design process. To this end, a multi-model optimization strategy is proposed by establishing design constraints on both the intact and damaged models. The dynamic effect of cable breakage is accounted for in the damaged models by the application of impact loads at the tower and deck anchorages. The objective function is to minimize the steel volume in the cable system by varying the cable anchor positions on the deck, the number of cables, the cross sectional areas and prestressing forces. This approach is applied to the Queensferry Crossing Bridge, the longest three-tower cable-stayed bridge in the world and also the largest with crossing cables in the central spans. The fail-safe optimization of the cable system leads to a different layout than the optimum design without considering cable breakage, with more cables and smaller areas, having a minimum penalty in steel volume.},

keywords = {Cable breakage, Cable-stayed bridge, Crossing cables, Fail-safe, Optimum design},

pubstate = {published},

tppubtype = {article}

}

@article{cid_open-source_2022,

title = {An open-source framework for aircraft damage simulation in engine failure events},

author = {Clara Cid and Aitor Baldomir-García and Miguel Rodríguez-Segade and Santiago Hernández-Ibáñez},

url = {https://www.sciencedirect.com/science/article/pii/S1877750322000904},

doi = {10.1016/j.jocs.2022.101682},

issn = {1877-7503},

year  = {2022},

date = {2022-07-01},

urldate = {2026-08-07},

journal = {Journal of Computational Science},

volume = {62},

pages = {101682},

abstract = {The aerospace industry demands designs capable of withstanding the simultaneous collapse of several structural elements. Examples of this failure scenario are propeller blade or uncontained engine rotor failures, where the structural integrity of the aircraft may be compromised by flying debris. To assess aircraft survivability, reliable simulation of accidental damage scenarios using physics-based models is required. Due to the complexity of characterizing these events, practitioners and researchers have traditionally assumed conservative damage envelopes, restraining potential design improvements. This research presents an object-oriented framework to automatically generate any number of damaged aircraft meshes in a realistic manner, taking into account the randomness of the event. Due to the flexibility in the software design, both random and deterministic input parameters are allowed, such as debris origin, impact orientation, number of impacts, debris size, debris velocity, spread angles and ballistic penetration equations. The tool is applied to a commercial narrow-body aircraft in which real failure scenarios are simulated.},

keywords = {Damage, Debris, Fail-safe, Propeller blade failure, Uncontained engine rotor failure},

pubstate = {published},

tppubtype = {article}

}