@@ -727,4 +727,42 @@ steel from coupon test results available. First, the theory of metal plasticity
urldate = {2026-05-07},
}
@InProceedings{RamirezMachado2025,
author = {Ramírez Machado, Brain Junior and Bozzo Fernández, Guillermo and González Lopez, Jose Manuel and Rastellini, Fernando G. and Irazábal González, Joaquín and Bozzo Rotondo, Luis Miguel},
title = {Advanced modeling of buckling delayed shear links under strong cyclic loads},
year = {2025},
organization = {National Technical University of Athens},
abstract = {This study investigates the advanced numerical modelling of a Buckling Delayed Shear Link (BDSL) system as a response control device aimed at improving the seismic resilience of structures. This system combines shear-based dissipative devices with an improved connection that transmits shear loads while preventing axial force, allowing for in-plane rotation. It currently accommodates displacements up to 60 mm. Experimental tests using cyclic loading were performed on specific dissipative element geometry to calibrate the mechanical properties and validate the numerical model. The tests, performed at the structures laboratory of the University of Lima, Peru, adhered to cyclic loading protocols following standard codes. The tests provided the structural response of the system in terms of hysteretic curves and failure modes. The methodology focuses on creating a three-dimensional numerical model of the BDSL using the Finite Element Method (FEM) to simulate its behaviour under cyclic loads. The FEM model of the dissipator features large displacements and incorporates both material and contact nonlinearities. ASTM A36 steel has been evaluated using a combined hardening model to represent its cyclic behaviour. A penalty-based algorithm handles contact in the special connection, ensuring accurate seismic response. The results show strong agreement regarding displacements, total shear forces, hysteretic curves, dissipated energy, and effective stiffness. Additionally, the experimental failure mode is analysed by considering key numerical variables: equivalent plastic strain and stress triaxiality. The analysis of key variables from calibrated models and numerical simulation data will be used to train a surrogate model using machine learning techniques. With this approach, the system can be optimised, and the structural response can be predicted at a low computational cost.},
language = {eng},
urldate = {2026-05-08},
}
@Article{Martinez2011,
author = {Martinez, Xavier and Rastellini, Fernando and Oller, Sergio and Flores, Fernando and Oñate, Eugenio},
journal = {Composites Part B: Engineering},
title = {Computationally optimized formulation for the simulation of composite materials and delamination failures},
year = {2011},
issn = {1359-8368},
month = mar,
number = {2},
pages = {134--144},
volume = {42},
abstract = {The numerical simulation of complex failure modes of composite materials, such as delamination, can be computationally very demanding, as it requires special elements and/or numerical strategies to characterize damage onset and propagation. This work presents several formulations developed to optimize the computational performance of an explicit finite element code designed specifically for the simulation of large scale composite structures. The composite mechanical performance is obtained with the matrix-reinforced mixing theory, a simplified version of the serial/parallel mixing theory that does not require an iterative procedure or the calculation of the tangent stiffness matrix. The number of elements required to perform the simulation is reduced by stacking several layers inside a single finite element. This work also proposes a modification of the isotropic damage law, capable of taking into account the residual strength provided by friction in type II fracture modes. The ability of these formulations to successfully predict the mechanical performance of composite materials is assessed with the ply drop-off test. In this test a laminate with a change of thickness in its mid-span is loaded until it breaks due to a delamination process. The formulation proposed obtains a very accurate prediction of the experimental response of the test, as it provides a very good characterization of the initial laminate stiffness, the delamination onset, and its propagation along the specimen.},
doi = {10.1016/j.compositesb.2010.09.013},
keywords = {A. Laminates, B. Delamination, C. Damage mechanics, C. Finite element analysis},
urldate = {2026-05-08},
}
@Misc{American2002,
title = {Seismic provisions for structural steel buildings},
year = {2002},
howpublished = {Standard, American Institute of Steel Construction},
}
@Misc{American2017,
title = {Minimum design loads and associated criteria for buildings and other structures},
year = {2017},
howpublished = {Standard, American Society of Civil Engineers},
