1,721,683 research outputs found
CEN. European Committee for Standardization
No full textÉsta es la página Web del Comité Europeo de Normalización (CEN), una entidad que promueve la eliminación de barreras comerciales para la industria europea y sus consumidores. A través de sus servicios proporciona una plataforma para el desarrollo de normas y otras especificaciones técnicas europeas, de las que es un importante proveedor. CEN es la única organización europea reconocida según la Directiva 98/34/CE para la planificación, elaboración y adopción de normas europeas en todos los ámbitos de la actividad económica, exceptuando la electrotecnología (CENELEC) y las telecomunicaciones (ETSI).
Los 31 miembros internacionales colaboran entre sí de forma voluntaria para desarrollar normas europeas (ENS). Estas normas tienen un carácter único, ya que también son normas nacionales en cada uno de sus 31 países miembros. Con una norma común en todos estos países y la eliminación de las diferencias en este sentido, un producto puede llegar a un mercado mucho más amplio con un desarrollo y unos costes de verificación mucho menores. ENS ayuda a construir un mercado interior europeo de bienes y servicios y posiciona a Europa en la economía mundial. El Acuerdo de Viena - firmado por el CEN en 1991 con la ISO (International Organization for Standardization) - su equivalente internacional - garantiza la cooperación técnica, la representación mutua en reuniones generales y de coordinación, y la aprobación del mismo texto, así como una norma ISO y una norma europea
Energy performance of buildings = Performance énergétique des bâtiments = Energieeffizienz von Gebäuden
No full textEl IBV designado por el CEN para liderar el proyecto sobre antropometría y fuerzas de la población infantil europea
No full textEl Instituto de Biomecánica (IBV) ha resultado
adjudicatario del concurso convocado por el Comité
Europeo de Normalización (CEN) para analizar
las demandas de los expertos pertenecientes a
los distintos Comités Técnicos de Normalización
vinculados a diferentes sectores infantiles, así como
la información antropométrica y de fuerzas de la
población infantil disponible en Europa y la calidad
de la misma
April Draft for second generation of Eurocode 4: EN 1994-1-1
No full textApril draft of second generation for Eurocode 4: EN 1994-1-1; Outcome from SC4.T6European Mandate Mandate M51
UNI EN 1991-1-6:2005 "Eurocodice 1 - Azioni sulle strutture - Parte 1-6: Azioni in generale - Azioni durante la costruzione"
No full textModelling Of The Thermal Behavior Of Walls And Floors In Contact With The Ground
Get PDFOne of the most complex configuration to model in detail, both in the dynamic simulation of buildings and in the analytical quasi steady-state calculations, is the thermal dispersion through the walls and the floor in contact with the ground. The problem consists in determining the boundary conditions of the external wall surface directly exposed to the soil, whose temperature cannot be considered undisturbed. Different studies, both experimental and numerical, have been carried out in the last decades in order to determine the ground boundary conditions, some of which have been used to elaborate the technical standard EN ISO 13370. This standard gives some indications about the conditions to be considered in the use of quasi steady-state methods and within the dynamic simulation. The evaluation of the simulation software in the specific context of the ground heat transmission, has also driven the IEA to define a specific series of validation cases, the BESTEST In-depth ground coupled heat transfer tests. The present research aim is to test implement reliable calculation procedures for the thermal dispersion through the building envelope towards the ground, in dynamic simulation modelling systems. In this work, a test case of the EN ISO 13370 standard has been modelled with FEM codes, both in steady-state conditions and also in periodic external conditions. Different types of floor have been considered, with different thickness and position of the insulation layer. The results have been compared with those calculated following the prescriptions of the standard EN ISO 13370
Dynamic analysis of the train-bridge interaction: an accurate and efficient numerical method
No full textThe dynamic behavior of railway bridges carrying high-speed trains can be analyzed with or
without the consideration of the vehicle's own structure. However, due to the amount of
kinetic energy carried at high speeds, the train may interact significantly with the bridge,
especially when resonance occurs. Equally important is the riding comfort and the stability of
the track and train cars, which are usually the most critical limit states in the design of this
type of structures. With the aim of studying this problem a computer code was developed,
being the interaction between the bridge and the train implemented by means of contact
conditions between each train wheel (nodal point) and the structure (point inside a finite
element). The treatment of the interaction between a train wheel and a point on the surface of
a finite element is directly and efficiently implemented by means of an extended stiffness
matrix, which includes stiffness, flexibility and additional terms that stem from the
compatibility equations between the displacements of the vehicle and the bridge. This
methodology was applied to the study of the dynamic behavior of a bowstring arch bridge and
proved to be very accurate and efficien
- …
