Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/8678
Título
Influence of the backfill parameters in distinct element modeling (DEM) of a backfill masonry arch bridge through the pfc2d software
Autor
Publicado en
REHABEND 2020: Construction Pathology, Rehabilitation Technology and Heritage Management, p. 1149-1157
Editorial
Lombillo Vozmediano, Ignacio
Fecha de publicación
2020
ISBN
978-84-09-17873-5
ISSN
2386-8198
Descripción
Trabajo presentado en: 8th Euro-American Congress on Construction Pathology, Rehabilitation Technology and Heritage Management, REHABEND 2020. Granada, 24-27 de marzo de 2020.
Abstract
This paper presents an investigation on how to model a backfill masonry arch bridge using the discrete element method (DEM). The calculations that geotechnical engineers use the most today are elastic calculations, which use an elastic modulus “E”, or plastic analysis that check the equilibrium limit, through a cohesion “c” and a friction angle “”. There is an important problem here in determining these parameters. Soils are not homogeneous materials, but have a great variability. The micromechanics of particles arises here to solve these difficulties PFC2D software is used for this purpose. A certain backfill masonry arch bridge is modelled, with different types of fill, mortar and voussoir materials. Contact bonds and parallel bonds are installed to create the arch at a first stage, positioning balls by their center and radius. Secondly the fill is introduced in several layers and finally the arch is loaded until its collapse in three different load cases. A biaxial test has been programmed using ‘FISH’ code to obtain the micro-parameters used in the model so that they match the macro-parameters obtained from a real biaxial test. Also, a macro within a spreadsheet has been created to simplify the process of introducing the geometry of the arch. Further discussion on the influence of the DEM backfill parameters is presented as well as a sensitivity analysis for the arch bridge, specially with backfill parameters and load position. Advantages, disadvantages and limitations of this method of analysis are identified in relation to other frequently used methods.
Palabras clave
Discrete Element Method
Backfill Masonry Bridge
PFC2D
Geomechanical modelling
Soil-structure interaction
Materia
Ingeniería civil
Civil engineering
Resistencia de materiales
Strength of materials
Informática
Computer science
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