Documentos para el ordenamiento jurídico y económico del barrio judío de Gerona (siglo XV)

Sin resume

Documentos para el ordenamiento jurídico y económico del barrio judío de Gerona (siglo XV)

Sin resume

Propuesta de cálculo de la resistencia a cortante de vigas armadas de acero de canto variable

Numerous experimental and numerical studies on prismatic plate girders subjected to shear can be found in the literature. However, the real structures are frequently designed as non-uniform structural elements. The main objective of the research is the development of a new proposal for the calculation of the ultimate shear resistance of tapered steel plate girders taking into account the specific behaviour of such members. A new mechanical model is presented in the paper and it is used to show the differences between the behaviour of uniform and tapered web panels subjected to shear. EN 1993-1-5 design specifications for the determination of the shear strength for rectangular plates are improved in order to assess the shear strength of tapered elements. Numerical studies carried out on tapered steel plate girders subjected to shear lead to confirm the suitability of the mechanical model and the proposed design expression.En la literatura pueden encontrarse numerosos estudios experimentales y numéricos sobre vigas armadas de acero de canto constante sometidas a cortante. Sin embargo, muchas estructuras de acero se proyectan, frecuentemente, con elementos de canto variable. El objetivo del artículo es ofrecer una formulación para el cálculo de la resistencia última a cortante de paneles de alma de canto variable, basada en un nuevo modelo mecánico, que es utilizado para mostrar las diferencias de comportamiento entre paneles de alma de canto constante y variable, sometidos a cortante. Las reglas de cálculo de EN 1993-1-5 para determinar la resistencia a cortante de paneles de alma de canto constante se mejoran para poder evaluar la resistencia a cortante de paneles de canto variable. Los numerosos estudios numéricos llevados a cabo sobre vigas armadas de acero de canto variable confirman la idoneidad del modelo mecánico y de la nueva expresión propuesta para el cálculo

The Continuous Strength Method for the design of stainless steel hollow section beam-columns

The Continuous Strength Method (CSM) is a deformation based design approach that provides accurate cross-section resistance predictions by making rational allowance for the interaction between cross-section elements, the partial spread of plasticity and the beneficial effects of strain hardening. The CSM can be used in conjunction with advanced analysis for the design of members and frames, but, for hand calculations, member-level stability checks are currently limited to stainless steel hollow section columns failing by flexural buckling. Extension to the design of stainless steel members subjected to combined compression and bending moment is presented in this paper. The analysis is based on numerical results and existing experimental data collected from the literature on stainless steel hollow section members, including members with stocky and slender cross-sections. Comparisons demonstrate that the adoption of the CSM design equations in conjunction with both current and revised interaction factors considerably improves the accuracy of beam-column capacity predictions for members with stocky cross-sections. The analysis on beam-columns with slender sections shows that similar resistance predictions are obtained using Eurocode 3 and the CSM. The reliability of the proposed approach is demonstrated through statistical analyses performed in accordance with EN1990

Numerical analysis of the behaviour of stainless steel cellular beam in fire

This paper appeared in a special Issue: Proceedings of Nordic Steel 201

Material and local buckling response of ferritic stainless steel sections

Research Fund for Coal and Steel, Ministerio de Ciencia e Innovació

The continuous strength method for the design of stainless steel hollow section columns

The Continuous Strength Method (CSM) provides accurate resistance predictions for both stocky and slender stainless steel cross-sections; in the case of the former, allowance is made for the beneficial effects of strain hardening, while for the latter, design is simplified by the avoidance of effective width calculations. Although the CSM strain limits can be used in conjunction with advanced analysis for the stability design of members, for hand calculations, the method is currently limited to the determination of cross-sectional resistance only, i.e. member buckling resistance is not covered. To address this limitation, extension of the CSM to the design of stainless steel tubular section columns is presented herein. The proposed approach is based on the traditional Ayrton-Perry formulation, but features enhanced CSM cross-section resistances and a generalized imperfection parameter that is a function of cross-section slenderness. The value of the imperfection parameter increases as the slenderness of the cross-section reduces to compensate for the detrimental effect of plasticity on member stability that is not directly captured in the elastic/first yield Ayrton-Perry approach. The accuracy of the proposed approach is assessed against numerical results generated in the current study and existing experimental results collected from the literature. The presented comparisons show that the CSM provides consistently more accurate member buckling resistance predictions than the current EN 1993-1-4 design rules for all stainless steel grades. The reliability of the proposed approach is demonstrated through statistical analyses performed in accordance with EN 1990. Finally, the paper presents a framework through which the proposed approach can be developed for other cross-section types and materials

Capacidad resistente de pilas metálicas tubulares circulares rellenas de hormigón (CFT) en puentes integrales

In this paper, an in-depth analysis of the structural response of concrete-filled tubular structures (CFT) is presented. The main objective of the study is to assess the resistance of these structural elements when subjected to lateral displacements. These displacements, together with the corresponding axial forces, represent the actions to which the integral bridges piers are subjected to. For the sake of studying this response, a numerical model is used as a simulation tool over an hypothetical matrix of CFT. These numerical studies together with a wide experimental database found in the literature have been useful for drawing conclusions concerning the cross-sectional capacity of the CFT. A design proposal for this cross-sectional capacity which accounts for confinement is given. This proposal has been compared structurally with the present formulation found in EN1994.<br><br>Se presenta el análisis estructural de pilas metálicas tubulares rellenas de hormigón (CFT) sometidas a flexo-compresión. El objetivo principal es valorar los mecanismos resistentes de las pilas cuando se someten a un desplazamiento en cabeza. Estos desplazamientos, conjuntamente con el esfuerzo axil de compresión, que en este trabajo se aproxima con un porcentaje de la resistencia plástica a compresión de los CFT, representan las acciones a las cuales se ven sometidos los elementos de este estudio. Se utiliza una herramienta numérica sobre una base hipotética de prototipos de pilas. Los resultados numéricos obtenidos así como los resultados experimentales encontrados en la literatura han permitido extraer conclusiones relativas a la capacidad seccional de los CFT. Se proponen expresiones de diseño relativas a la capacidad resistente de los CFT considerando el efecto del confinamiento y se comparan con los resultados que se derivan de la formulación de EN1994