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Three-dimensional modeling of long-term structural behavior of wood-concrete composite beams

Fragiacomo, Massimo and Balogh, Jeno and To, Lam and Gutkowski, Richard M. (2014) Three-dimensional modeling of long-term structural behavior of wood-concrete composite beams. Journal of Structural Engineering, Vol. 140 (8), A4014017. ISSN 0733-9445. eISSN 1943-541X. Article.

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DOI: 10.1061/(ASCE)ST.1943-541X.0000909

Abstract

This paper presents a three-dimensional (3D) numerical model for capturing the time-dependent behavior of layered wood-concrete composite beams with notched shear key interlayer connections, subject to long-term static load and simultaneous exposure to naturally changing ambient environmental conditions, including temperature and relative humidity. For the wood material, the research extends the formulation of a previous rheological model, originally proposed for uniaxial stress state of wood exposed to moisture variations, to 3D finite-element modeling with a multiaxial stress state. For the concrete material, a standard creep model for uniaxial stress states was approximated using a generalized Maxwell’s model and then expanded to 3D formulations. The 3D model described in this paper was implemented via external user subroutines in the commercial software ABAQUS. Finite-element models for a wood-concrete composite beam with notched shear key were developed to model the diffusion problem of moisture content and the heat transfer when the beam is exposed to the environment. The moisture content, temperature profiles, and long-term static loading are used as input parameters for the time-dependent analysis problem involving the expanded material models. The results of numerical models are compared and verified with available experimental results as well as with numerical results obtained using a more simplified one-dimensional (1D) beam model previously developed. Although the improvement in accuracy compared to the 1D model is insignificant, the 3D model has the advantage of not requiring mechanical and rheological characterization of the connection, which can only be carried out via expensive short- and long-term experimental tests.

Item Type:Article
ID Code:10004
Status:Published
Refereed:Yes
Uncontrolled Keywords:Composite beams, concrete, connections, creep, finite-element method, numerical models, shrinkage, time dependence, timber construction, wood, analysis and computation
Subjects:Area 08 - Ingegneria civile e Architettura > ICAR/09 Tecnica delle costruzioni
Area 08 - Ingegneria civile e Architettura > ICAR/09 Tecnica delle costruzioni
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Architettura, Design e Urbanistica
Publisher:ASCE - American Society of Civil Engineers
ISSN:0733-9445
eISSN:1943-541X
Additional Information:SPECIAL ISSUE: Computational Simulation in Structural Engineering
Deposited On:06 Aug 2014 14:02

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