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dc.contributor.author
Garcia, Diego Alberto
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dc.contributor.author
Rosales, Marta Beatriz
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dc.contributor.author
Sampaio, Rubens
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dc.date.available
2020-03-05T21:42:13Z
dc.date.issued
2018-11
dc.identifier.citation
Garcia, Diego Alberto; Rosales, Marta Beatriz; Sampaio, Rubens; Dynamic behaviour of a timber footbridge with uncertain material properties under a single deterministic walking load; Elsevier Science; Structural Safety; 77; 11-2018; 10-17
dc.identifier.issn
0167-4730
dc.identifier.uri
http://hdl.handle.net/11336/98887
dc.description.abstract
The dynamic study of a short span timber footbridge with uncertain mechanical properties under the action of a deterministic walking load model which represents one individual is presented. The aim of the work is to quantify the influence of the uncertain material properties in the natural and forced vibration problems of a short span timber footbridge. These structural systems made of timber are increasingly employed due to the high stiffness/weight ratio that this material exhibits. This feature can lead to lightweight structural systems in which the acceleration levels can exceed the human comfort limits. The assumed sources of uncertainties of this structural model are the Modulus of Elasticity (MOE) and the mass density. Also, the geometrical design of the boards that compose the laminated timber beams supporting the floor involves variability of the distances between finger joints. Probability Density Functions (PDFs) of the timber properties are formulated from the Principle of Maximum Entropy (PME). The finger joints distance generates the lengthwise variability of the MOE and the mass density in each board of the laminated beams. The PDFs of the natural frequencies of the structure, the mode shapes and the structural response are numerically obtained through the Finite Element Method (FEM) and statistic tools. In order to carry out this analysis, plate and laminated beam elements derived from the First Order Shear Deformation Theory (FSDT) are employed. The variation of the effective stiffness and mass along the elements due to the union of boards with different properties produces an important reduction of the standard deviation of the natural frequencies. The conditions in which the stochastic properties of the structure lead to unacceptable acceleration levels are studied. In some scenarios, the variation of the material properties can lead to unacceptable serviceability performances of the structure and a reduction in the pedestrian comfort, according to the codes in force. However, new design guidelines replace the line limits by comfort regions which are also discussed here.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
STRUCTURAL DYNAMICS
dc.subject
TIMBER FOOTBRIDGE
dc.subject
UNCERTAIN PROPERTIES
dc.subject
WALKING LOAD MODELS
dc.subject.classification
Ingeniería Estructural
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dc.subject.classification
Ingeniería Civil
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dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
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dc.subject.classification
Estadística y Probabilidad
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dc.subject.classification
Matemáticas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Dynamic behaviour of a timber footbridge with uncertain material properties under a single deterministic walking load
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-02-26T19:38:03Z
dc.journal.volume
77
dc.journal.pagination
10-17
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Garcia, Diego Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Misiones. Facultad de Ingeniería. Departamento de Ingeniería Civil; Argentina
dc.description.fil
Fil: Rosales, Marta Beatriz. Universidad Nacional del Sur; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Sampaio, Rubens. Pontificia Universidade Católica do Rio Grande do Sul; Brasil
dc.journal.title
Structural Safety
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.strusafe.2018.11.001
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0167473018301127
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