Browsing by Author "Chica, J. A."
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Item A new model for transient heat transfer model on external steel elements(2008-06) Chica, J. A.; Morente, F.; SG; E&I SEGURAS Y RESILIENTESThe Eurocode system provides limited information regarding the structural fire design of external steel structures. Eurocode 1 provides thermal action for external member but only in steady-state conditions. On the other hand, Eurocode 3 provides a methodology to determine heat transfer to external steelwork, but there is no distinction in cross section shapes and, in addition, the calculated temperature distribution is assumed to be uniform in the cross section. This paper presents the results of a research carried out to develop a new transient heat transfer model for external steel elements to improve the current approach of the Eurocodes. This research was carried out as part of the project EXFIRE "Development of design rules for the fire behaviour of external steel structures", funded by the European Research Programme of the Research Fund for Coal and Steel (RFCS).Item Recommendations on imperfections in the design of plated structural elements of bridges(2013) Chica, J. A.; San José, J. T.; Millanes, F.; Manso, J. M.; SGHigh-yield strength steel-plated structures represent competitive solutions when used in steel and steel-concrete composite bridges. Nevertheless, further modifications may still be introduced at the design stage in the case of slender sections, in order to minimize the number of their stiffeners and thereby economize on manufacturing costs. Eurocode 3 "Design of steel structures" specifies design methodologies for slender plates subjected to compression and for stiffeners. Moreover, the use of Finite Element Method (FEM) software is fast becoming an alternative analytical method for the design of complete structures or structural elements, as it offers a more realistic approach. This paper makes recommendations for FEM assessments of plated sections in bridges that take the initial imperfections, geometric imperfections and residual stresses of the sections into account, in order to arrive at realistic results.Item A simple experimental and simulation framework for the design of steel fiber reinforced concrete(International Centre for Numerical Methods in Engineering, CIMNE, 2020) Garcia, Aratz; Ortega-Lopez, Vanesa; Chica, J. A.; Aguirre, Miquel; Owen, Roger; de Borst, Rene; Reese, Jason; Pearce, Chris; Tecnalia Research & Innovation; SGSteel fiber reinforced concrete (SFRC) has proven to provide excellent mechanical performance in terms of increased strength, ductility and energy absorption capacity [1]. These enhancements are provided by bridging phenomena and multiple-cracking distribution [1]. The numerical simulation of its mechanical behavior cannot be carried out with standard commercial codes yet, and its numerical simulation is mostly limited to academic research. With the goal of carrying out engineering design and optimization SFRC structures, this paper presents the implementation of an experimental and numerical framework for the design of structures by means of SFRC. The presented work is based on previous results by other authors in modelling SFRC by means of an efficient multilevel computational framework [2], in which interface elements characterizing the bridging and cracking phenomena [3] are embedded within pre-existing Finite Element Method (FEM) codes. This framework will be implemented and validated in existing in-house FEM codes and in an open-source FEM package. In parallel, adequate experimentation has been carried out to define input parameters [4] and, validate the numerical algorithm. Overall, the framework intends to provide a general guideline for the efficient design of SFRC structures.Item Transient heat transfer model on external steel elements and external hollow steel sections filled with concrete(2007) Morente, F.; Chica, J. A.; E&I SEGURAS Y RESILIENTES; SGA new model has been developed by LABEIN TECNALIA within the RFCS project "Development of design rules for the fire behaviour of external steel structures", improving the Eurocode's model.