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Numerical and analytical assessment of the buckling behaviour of Blockhaus log-walls under in-plane compression

Bedon, Chiara and Fragiacomo, Massimo (2015) Numerical and analytical assessment of the buckling behaviour of Blockhaus log-walls under in-plane compression. Engineering structures, Vol. 82 , p. 134-150. ISSN 0141-0296. eISSN 1873-7323. Article.

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DOI: 10.1016/j.engstruct.2014.10.033

Abstract

Blockhaus structural systems are commonly obtained by assembling multiple timber logs, by stacking them horizontally on the top of one another. Although based on simple mechanisms of ancient origins, the structural behaviour of Blockhaus systems under well-defined loading and boundary conditions is complex to predict.
The paper focuses on the assessment of the typical buckling behaviour and resistance of vertically compressed timber log-walls. The effects of various mechanical and geometrical variables such as possible load eccentricities and initial curvatures, openings (e.g. doors or windows), fully flexible or in-plane rigid inter-storey floors are investigated by means of detailed finite-element (FE) numerical models. These FE models were first validated on test results of past buckling experiments performed on scaled log-wall specimens, as well as on recent buckling experiments carried out on full-scale timber log-walls, demonstrating the capability to appropriately describe the effective interaction between timber logs and to correctly predict the expected buckling failure mechanisms and ultimate resistance for the log-walls that were investigated. Comparisons with analytical solutions partly derived from classical theory of plate buckling and column buckling are also presented and critically discussed, in order to assess the applicability of these existing formulations – although specific for fully monolithic and isotropic plates and columns – to Blockhaus structural systems. A closed-form solution is finally proposed as a simplified design buckling method for timber log-walls under in-plane compression.

Item Type:Article
ID Code:10600
Status:Published
Refereed:Yes
Uncontrolled Keywords:Timber log-walls, buckling, analytical models, finite-element numerical modelling, buckling experiments
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:Elsevier
ISSN:0141-0296
eISSN:1873-7323
Deposited On:13 Jan 2015 11:46

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