Unofficial description of loads and masses of high speed train in Spanish network AVE S-103 (Siemens ICE3 Velaro)

Unofficial simplified mechanical description of AVE S-103 - ICE3 Velaro E high speed train. Includes Geometru, suspension, masses and inertias, and axle loads

Nuevas Investigaciones en la Dinámica de puentes de ferrocarril de alta velocidad

1. Moticacion Nuevos puentes 2. Efectos Dinámicos (¿Puentes Seguros?) 3. Requisitos de Servicio (¿Traco Seguro?) 4. Modelos y Normas (¿Cómo saberlo?) Modelos de Cálculo Normas Técnicas 5. Observaciones finale

Safety-related issues for high-speed railway bridges

Railway bridges have specific requirements related to safety, which often are critical aspects of design. In this paper the main phenomena are reviewed, namely vertical dynamic effects for impact effect of moving loads and resonance in high-speed, service limit states which affect the safety of running traffic, and lateral dynamic effects

Laudatio de José María Goicolea en el acto homenaje a Antonio Angulo Álvarez por su nombramiento como Miembro de Honor de la Asociación de Ingenieros de Caminos

Laudatio, acto en homenaje a Antonio Angulo Álvarez por su nombramiento como Miembro de Honor de la Asociación de Ingenieros de Caminos

Research related to vibrations from high speed railway traffic

We discuss here recent results from several research programmes related to dynamic aspects and vibrations induced by high speed railway traffic, developed at the computational mechanics group, within the “Escuela de Ingenieros de Caminos” of the Technical University of Madrid. The first part of this work concerns the dynamic response of railway bridges and structures under high speed traffic. The study of vertical dynamic effects in bridges has lead recently to improved understanding and practical design concepts, embodied in the new engineering codes [1,2,3,4,5]. Some special and seldom considered features of the dynamic response are also discussed. In the second part we present some results for lateral dynamic effects. These have not been so widely studied as the vertical vibrations, however they may pose significant problems for bridges. Finally, in the third part we discuss recent results of ongoing research for the mechanical response of slab track and ballast track, focusing on the vertical vibration of the track and the associated dynamic traffic loads

Numerical modelling in large strain plasticity with application to tube collapse analysis

Numerical methods are proposed for the analysis of 2 or 3-dimensional large strain plasticity problems. A Finite Difference program, with 2-dimensional continuum elements and explicit time integration, has been developed and applied to model the axisymmetric crumpling of circular tubes. New types of mixed elements (Triangles-Quadrilaterals for 2-D, Tetrahedra-Bricks for 3-D) are proposed for the spatial discretization. These elements model accurately incompressible plastic flow, without unwanted "zero-energy" deformation modes or tangling over of the mesh. Elastic-plastic, rate dependent laws are modelled with a "radial return" algorithm. The transmission of heat generated by plastic work and material dependence on temperature are also included, enabling a fully coupled thermo-mechanical analysis. A 2-D and axisymmetric computer program has been developed, implementing the numerical techniques described. Computational efficiency was essential, as large scale, costly applications were intended. An important part of the program was the contact algorithm, enabling the modelling of interaction between surfaces. The axisymmetric crumpling of tubes under axial compression ("concertina" mode) has been analyzed Numerically. Quasi-static experiments on Aluminium tubes were modelled, using velocity scaling. Very large strains are developed in the crumpling process; with the help of tension tests, material laws valid for such strain ranges were developed. Good agreement was obtained between numerical predictions and experimental results. Modelling choices such as mesh refinement, element type and velocity scaling were studied, and found to have an important influence on the numerical predictions. Finally, a large scale impact analysis of a steel tube at 176m/s was performed. The results compared well with experiment, indicating differences with the behaviour of low velocity crumpling mechanisms. To conclude, Finite Difference procedures with explicit time- marching techniques are proposed for large strain plasticity problems, at low or medium impact velocities. A fairly robust code has been developed and applied successfully to a range of large strain and tube crumpling problems

Colaboración entre ingeniería y unidades clínicas para investigación en biomecánica

Ventajas de la colaboración entre la ingeniería y la medicina: casos prácticos en investigación biomecánica

Acciones dinámicas debidas al tráfico ferroviario en viaductos de alta velocidad

1. Motivacion 2. Respuesta dinámica y modelos de cálculo Cargas de Tráfico Comprobaciones y modelos 3. Normatica reciente Trenes reales, HSLM y trenes tipo Eurocódigos EN1991-2, EN1990/A1 Interoperabilidad en la Red TransEuropea: ETI-INF Instrucción Española IAPF-2007 y Anejos Naconales 4. Investigación sobre dinámica de estructuras Dinámica transversal de vehículos ferroviarios sobre viaductos 5. Comentarios finale

Dynamic effect of high speed railway traffic loads on the ballast track settlement

The traditional ballast track structures are still being used in high speed railways lines with success, however technical problems or performance features have led to non-ballast track solution in some cases. A considerable maintenance work is needed for ballasted tracks due to the track deterioration. Therefore it is very important to understand the mechanism of track deterioration and to predict the track settlement or track irregularity growth rate in order to reduce track maintenance costs and enable new track structures to be designed. The objective of this work is to develop the most adequate and efficient models for calculation of dynamic traffic load effects on railways track infrastructure, and then evaluate the dynamic effect on the ballast track settlement, using a ballast track settlement prediction model, which consists of the vehicle/track dynamic model previously selected and a track settlement law. The calculations are based on dynamic finite element models with direct time integration, contact between wheel and rail and interaction with railway cars. A initial irregularity profile is used in the prediction model. The track settlement law is considered to be a function of number of loading cycles and the magnitude of the loading, which represents the long-term behavior of ballast settlement. The results obtained include the track irregularity growth and the contact force in the final interaction of numerical simulatio

Coupled models for the dynamics of bridges under high-speed rail traffic

The dynamic effects of high-speed trains on viaducts are important issues for the design of the structures, as well as for determining safe running conditions of trains. In this work we start by reviewing the relevance of some basic moving load models for the dynamic action of vertical traffic loads. The study of lateral dynamics of running trains on bridges is of importance mainly for the safety of the traffic, and may be relevant for laterally compliant bridges. These studies require 3D coupled vehicle-bridge models and consideration of wheel to rail contact. We describe here a fully nonlinear coupled model, formulated in absolute coordinates and incorporated into a commercial finite element framework. An application example is presented for a vehicle subject to a strong wind gust traversing a bridge, showing the relevance of the nonlinear wheel-rail contact model as well as the interaction between bridge and vehicle