Calculation tool for estimation of the material properties of glulam beams with known layout
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Insinööritieteiden korkeakoulu |
Master's thesis
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Authors
Date
2020-08-17
Department
Major/Subject
Mcode
Degree programme
Master's Programme in Building Technology (CIV)
Language
en
Pages
47+15
Series
Abstract
Properties of glued laminated timber are subjected to large uncertainties. To increase material reliability and utilization ratio, these uncertainties should be handled more efficiently. The aim of this study was to develop a tool for reliable prediction of load-bearing capacity of glulam beams with well-known properties. Different models were applied in Monte-Carlo simulation framework and their performance were evaluated on the set of tested beams from literature. Prediction of bending strength as well as estimation of failure initiation location were of special interest. Using transformed cross-section method, influence of strength, stiffness and finger joint material models to the glulam properties estimation was evaluated. It was found that for better strength prediction lamination effect should be additionally taken into account in exploited lamination strength model. Simulation with this calibration gave significantly improved strength prediction for the beams. Established simple isotropic FEM model showed similar results as transformed cross-section method. When orthotropic material model was utilized, lower strength of beams was predicted. By means of fictitious crack approach in Abaqus, crack propagation and branching in glulam beams in bending were simulated. Established FEM model allowed simulation of progressive failure, however still leaving room for improvement in the strength prediction regard.Description
Supervisor
Fink, GerhardThesis advisor
Jaaranen, JoonasKeywords
timber, glulam, transformed cross-section method, FEM, Hashin's failure, Abaqus