Journals
Journal:
ENGINEERING STRUCTURES
ISSN:
0141-0296
Year:
2021
Vol.:
235
pp.
112062
Finite element models tend to overestimate the actual elastic response of structural timber connections. The paper shows how such overprediction relates to the modelling of the contact between fasteners and timber. The use of a control parameter called stiffness contact is proposed. After an experimental campaign, a method to determine it, based only on the geometry of a rectangular contact area, is proposed. The modeling adequacy is demonstrated by applying it to dowel embedment and moment resistant wood joint tests. The obtained results show good agreement with the experimental test series.
Journal:
DYNA
ISSN:
0012-7361
Year:
2021
Vol.:
96
N°:
5
pp.
464 - 467
Desde los inicios del análisis estructural de las estructuras de mampostería, se ha perseguido conocer su comportamiento teniendo en cuenta la influencia de los distintos elementos que lo conforman, evolucionando el análisis estructural de los arcos de fábrica hasta analizar el comportamiento fracto-mecánico de la mampostería.
Este artículo presenta la adaptación del criterio de falla de Tsai- Hill para materiales ortótropos, aplicado al estudio de los arcos de mampostería. Ello se ha llevado acabo la adaptación en una subrutina VUSFLD de ABAQUS en lenguaje de programación Fortran. Esta subrutina se ha validado en atención a la falla del mortero, y se ha analizado el efecto del mortero en el análisis de un arco de mampostería. La subrutina implementada en un masomodelo permite observar la contribución del mismo a la capacidad portante de un arco.
Journal:
ENGINEERING STRUCTURES
ISSN:
0141-0296
Year:
2021
Vol.:
247
pp.
113122
The development of accurate structural modelling techniques is required to promote the use of timber as a renewable alternative to other structural materials. Due to their remarkable influence on the global behaviour of a timber structure, an accurate description of the performance of structural connections is needed. Particularly in the case of moment transmitting beam-to-column connections with dowel-type fasteners, such properties are difficult to obtain experimentally. This paper develops a finite element (FE) model that simulates the behaviour of these connections under quasi-static loading, with a focus on the estimation of rotational stiffness and load distribution among the dowels. The model is validated against short-term laboratory tests. Resulting friction between timber members due to the installation procedure must be considered, as it greatly influences the rotational response. Besides, non-linear behaviour of timber and a softened contact parameter have been implemented, and their influence on the FE model validation process is demonstrated.
Journal:
ENGINEERING STRUCTURES
ISSN:
0141-0296
Year:
2016
Vol.:
117
pp.
332 - 343
Wood, as a natural heterogeneous material, is a challenging material to simulate. This work presents an algorithm to model both its elastic and post-elastic responses. It allows to model different compression and tension elastic and failure behaviors in both material directions, parallel and perpendicular to the grain. It employs two different strategies: a sequential application of different failure criteria, and the modeling of post-elastic response by means of damage and stress reduction parameters. The proposed algorithm is applied to spruce in two experimental cases with different loadings and failure modes. When reasonable mesh density and increment size are used, the obtained results are in good agreement with the experimental results. The proposed algorithm has been programmed in the commercial software ABAQUS. However, it may be easily applied to different platforms or wood species.
Authors:
Sánchez-Beitia, S.; Torres, L.; Barrallo, J.; et al.
Journal:
GDANSKI ROCZNIK KULTURALNY
ISSN:
0860-2492
Year:
2012
Vol.:
1-3
pp.
2060 - 2064
The paper deals with the first works for the application of the Hole-Drilling technique on timber structures in service. The final objective of the research is the deduction of the stresses in structural elements of Architectural Heritage. The method involves glued strain gages at the surface of a structural element. At least three strain gages are placed in the area under consideration in order to record the strains originated by stress relaxation after eliminating a round of 18 mm diameter and 16 mm depth. The stresses before drill can be deduced with an appropriate mathematical scheme. The Hole Drilling technique can be considered as minor destructive test providing sufficient information to calculate the principal stresses and their directions around the drill. At laboratory four wood specimens (blocks) have been loaded under known stresses in order to compare them with those stresses obtained by the hole drilling procedure. The results show some desviation because the mathematical scheme assumes the blocks as isotropic material. In this sense, the research described has to be improved to take into account the orthotropyc behavior of the wood as structural element.
National and regional funding
Title:
Nueva metodología para la caracterización directa y automática de uniones 2D viga-pilar, en acero y madera, mediante metamodelos
especializados basados en modos de deformación.
Project reference:
BIA2016-80358-C2-1-P
Funding organisation:
MINISTERIO DE CIENCIA, INNOVACIÓN Y UNIVERSIDADES
Programme/Call:
2016 MINECO EXCELENCIA. PROYECTOS I+D
Starting date:
30/12/2016
Ending date:
29/09/2020
Amount awarded:
77.440,00€
Other Funds:
Fondos FEDER
Title:
Desarrollo de un elemento resistente a base de Lignumstrand para la construcción con madera.
Project reference:
0011-1365-2017-000214
Principal Investigator:
José Manuel Cabrero Ballarín
Funding organisation:
GOBIERNO DE NAVARRA
Programme/Call:
2017 GN I+D
Starting date:
04/05/2017
Ending date:
22/07/2018
Amount awarded:
43.425,73€
Other Funds:
-
Title:
Hacia un análisis fiable y eficiente de las uniones de madera: ensayos de material e interaccón, y modelado numérico.
Project reference:
PID2020-118569GB-C21
Principal Investigator:
José Manuel Cabrero Ballarín
Funding organisation:
AGENCIA ESTATAL DE INVESTIGACION
Programme/Call:
2020 AEI PROYECTOS I+D+i (incluye Generación del conocimiento y Retos investigación)
Starting date:
01/09/2021
Ending date:
31/08/2025
Amount awarded:
132.495,00€
Other Funds:
-
Title:
Soluciones Innovadoras para Estructuras de Madera
Contralaminada (Innovative Solutions for Cross Laminated Structures)
Project reference:
PCI2019-103591
Funding organisation:
MINISTERIO DE CIENCIA, INNOVACIÓN Y UNIVERSIDADES
Programme/Call:
2019 MINECO APCIN
Starting date:
01/03/2019
Ending date:
31/10/2022
Amount awarded:
109.000,00€
Other Funds:
Fondos FEDER
Title:
Diseño y caracterización de elementos constructivos prefabricados de hormigón con áridos reciclados
Project reference:
0011-4387-2023-000003
Principal Investigator:
Germán Ramos Ruiz
Funding organisation:
GOBIERNO DE NAVARRA
Programme/Call:
2023 GN Subvención del Fondo de Residuos
Starting date:
01/01/2024
Ending date:
31/12/2025
Amount awarded:
91.822,50€
Other Funds:
-
Title:
BOSQUES DEL SIGLO XXI, EMPODERADOS, INNOVADORES Y CON EMPRENDIMIENTO
Project reference:
BF217
Principal Investigator:
José Manuel Cabrero Ballarín
Funding organisation:
FUNDACION BIODIVERSIDAD
Programme/Call:
2023 FD Biodiversidad. Proyectos para la promoción de la bioeconomía y la contribución a la transición ecológica
Starting date:
01/01/2024
Ending date:
31/12/2025
Amount awarded:
118.361,00€
Other Funds:
Fondos MRR