Publicado en

EXPERIMENTAL, ANALYTICAL AND NUMERICAL VIBRATION ANALYSIS OF LONG-SPAN TIMBER-TIMBER COMPOSITE FLOOR IN SELF-TENSIONING AND NON-TENSIONING CONFIGURATIONS

CONSTRUCTION AND BUILDING MATERIALS

2018  (2019) 341-350

mayo 2019

ABSTRACT

An experimental campaign was carried out on the dynamic behaviour of timber-timber composite pieces under different loading conditions. This study compares the behaviour of non-tensioning and selftensioning configurations under different stages of loading. The results show that the presence of an
un-bonded prestressed bar hardly alters the eigenfrequency value in comparison with non-tensioned solutions, although it significantly reduces the damping ratio. An analytical methodology is presented that makes it possible to predict dynamic behaviour in terms of eigenfrequency with great exactitude.
The simplicity of factors required by the analytical technique means that this method can be used as a design tool. FEM models were developed for each test configuration, and the different load states were analysed. The results show an extremely precise match with those obtained in the test campaign, indicating that this numerical methodology is suitable for the dynamic analysis of these structural elements.

https://doi.org/10.1016/j.conbuildmat.2019.05.084

Publicado en

PERFORATED SHEAR + REINFORCEMENT BAR CONNECTORS IN A TIMBER-CONCRETE COMPOSITE SOLUTION. ANALYTCAL AND NUMERICAL APPROACH

COMPOSITES PART B

B 156 (2019) 138-147

22 agosto 2018

ABSTRACT

This paper presents a study of a novel shear connector in a timber-concrete composite solution, focussing on the determination of an analytical expression that makes it possible to predict its behaviour and a numerical analysis that describes it accurately. The shear connector is composed of a perforated steel plate inserted into a slot within the timber rib and glued, in combination with reinforcing corrugated steel bars affixed to the top of the
plate. Previous tests made it possible to establish failure mode in different T composite section plate-rebar configurations. These results determine the effectiveness of the system in terms of force-slip behaviour, with systematic failure in the timber section. A simple predictive model is proposed to determine the ultimate capacity of the joint, taking into account the mechanical properties of timber in relation with the fracture plane
and the timber-adhesive interface. This model makes it possible to apply a design process that is able to predict the stiffness of the connection.
FEM models were analysed for each configuration in a variable load process equal to that used in the test, according to the standard procedure. A variable friction coefficient in contact definition made it possible to achieve an accurate descriptive model in association with the test procedure.

DOI

Publicado en

METODOLOGÍA DE ANÁLISIS DE FORJADOS AUTOTESADOS DE MADERA

INFORMES DE LA CONSTRUCCIÓN

VOL. 69, 547, e207

julio-septiembre 2017

RESUMEN

Se describe un sistema de autotesado constituido por un dispositivo multiplicador de fuerza que acoplado a los apoyos extremos del elemento estructural resulta capaz de convertir la resultante vertical de las acciones gravitatorias en una acción efectiva de tesado mediante el movimiento inducido en un juego de bielas. El sistema de autotesado es capaz de ofrecer unas altas prestaciones gracias al efecto beneficioso de la deformación contraria generada por el tesado de forma proporcional al incremento de la acción gravitatoria. Ello permite diseñar forjados nervados de maderara de elevada luz empleando cantos reducidos.

DOI

Publicado en

NEW FORMAL EXPECTATIONS. THE DYNAMIC ALTERNATIVE BETWEEN THE EVIDENT AND THE DISTURBING

STRUCTURES AND ARCHITECTURE

ICSA 2016

JULIO 2016

Resumen

La concepción racionalista introduce una forma de entender la estructura, su materialidad y el proceso de diseño del sistema estructural.  Esta convergencia de los valores determina cómo se ha procedido en el  tratamiento de la estructura en la Arquitectura del siglo XX. Ese concepto de una estructura estática no es apropiado para una arquitectura que se basa en el carácter poliédrico de la arquitectura actual. La búsqueda de una participación activa del usuario en la valoración de la construcción encuentra una alternativa efectiva en formas dinámicas. El desequilibrio, la inestabilidad o el caos se constituyen en patrones que generan formas. Y en estos patrones la estructura participa de manera activa. Frente al sistema estructural impuesto, que proviene de una forma, se recupera la percepción de una estructura que está presente en estas formas que juegan con la gravedad.