Frank Schanack

Diseño, construcción y ensayo de una estructura de sección mixta madera laminada-hormigón para su uso en puentes

El presente articulo aborda una investigacion teorico-experimental acerca de estructuras de seccion mixta madera laminada-hormigon. Se enfoca en la validacion de simples tirafondos como conectores para su uso en puentes. Se disenan vigas basandose en el metodo ensayos de corte en probetas mixtas y por otro lado en un ensayo a flexion en una viga de seccion mixta. Los resultados obtenidos de estos ensayos, en cuanto a la rigidez de la conexion, son muy favorables, resultando esta 2 a 3 veces mayor que lo calculado teoricamente. El estudio comprueba la eficacia estructural de la construccion mixta madera laminadahormigon con conectores tipo tirafondo y su aptitud para el uso en puentes. Palabras clave: Hormigon, madera laminada, seccion mixta.

Relative Displacement Method for Track-Structure Interaction

The track-structure interaction effects are usually analysed with conventional FEM programs, where it is difficult to implement the complex track-structure connection behaviour, which is nonlinear, elastic-plastic and depends on the vertical load. The authors developed an alternative analysis method, which they call the relative displacement method. It is based on the calculation of deformation states in single DOF element models that satisfy the boundary conditions. For its solution, an iterative optimisation algorithm is used. This method can be implemented in any programming language or analysis software. A comparison with ABAQUS calculations shows a very good result correlation and compliance with the standards specifications.

Dynamic Analysis of a Composite Cable-Stayed Bridge: Escaleritas Viaduct

This work describes some of the most important results of the experimental and numerical analyses of Escaleritas Viaduct, Spain. Before the inauguration of this composite cable-stayed bridge in 2006, the bridge authority required a dynamic load test identifying, for instance, the natural vibration modes, the dynamic magnification factor, and the maximum vertical acceleration. The dynamic test was accompanied by numerical simulation performed in two different three-dimensional finite-element models, one of them composed of 145,000 shell elements. The correlation of test and analysis data is good and allows several interesting general conclusions to be drawn. It is shown that Escaleritas Viaduct complies with the requirements on the dynamic structural behavior defined in the standards.