Prediction of Beam Stiffness for Structural Glued laminated Timber

The objective of the study was made to develop a probabilistic model for predicting the statistical distribution of stiffness properties of some selected Malaysian timbers.In this respect, a three-step experimental approach was adopted before simulated beam stiffness for the species population was d...

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Main Author:	Ong, Chee Beng
Format:	Thesis
Language:	English
Published:	2004
Subjects:	Girders - Case studies Laminated wood - Case studies
Online Access:	http://psasir.upm.edu.my/id/eprint/248/1/549493_FH_2004_6.pdf
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id	my-upm-ir.248
record_format	uketd_dc
spelling	my-upm-ir.2482015-08-06T03:16:42Z Prediction of Beam Stiffness for Structural Glued laminated Timber 2004-05 Ong, Chee Beng The objective of the study was made to develop a probabilistic model for predicting the statistical distribution of stiffness properties of some selected Malaysian timbers.In this respect, a three-step experimental approach was adopted before simulated beam stiffness for the species population was derived. Firstly, a number of probability functions representing the actual distribution of selected timber data were examined. Goodness-offit (GOF) analysis was then carried out to establish the best fitting distribution function for the experimental data used.Secondly, the modulus of elasticity (MOE) of solid and finger-jointed samples was obtained from non-destructive testing (NDT) using the fundamental vibration frequency methodology. Results from the above method were calibrated against those obtained through static bending test by means of Universal Testing Machine. Finally, glued-laminated timber (glulam) beams were fabricated using laminations with predetermined MOEs by NDT method and the beams were later subjected to 3-point static bending test for MOE determination.In the mean time, finite element method (FEM) coupled with transformed section approach, was also used to simulate the glulam beam tests after experimental length effect was incorporated.The MOE of beams population was then predicted using randomly generated MOE and length data.The GOF analysis indicates that 3-parameter Weibull distribution best fit the probability distribution of the tested timber. Results from the NDT method also showed a good relationship between the fundamental vibration frequency test and the static bending test conducted with a coefficient of determination of about 0.89. In the simulation of glulam beams, the MOE values of simulated glulam beams are generally higher than the actual tests conducted, particularly in durian hutan, with a percentage difference of about 23%.In the prediction of the MOE glulam beams population, the generated distribution exhibits higher MOE values compared to the average value reported respectively for durian hutan and rubberwood species Girders - Case studies Laminated wood - Case studies 2004-05 Thesis http://psasir.upm.edu.my/id/eprint/248/ http://psasir.upm.edu.my/id/eprint/248/1/549493_FH_2004_6.pdf application/pdf en public masters Universiti Putra Malaysia Girders - Case studies Laminated wood - Case studies Faculty of Forestry
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Girders - Case studies Laminated wood - Case studies
spellingShingle	Girders - Case studies Laminated wood - Case studies Ong, Chee Beng Prediction of Beam Stiffness for Structural Glued laminated Timber
description	The objective of the study was made to develop a probabilistic model for predicting the statistical distribution of stiffness properties of some selected Malaysian timbers.In this respect, a three-step experimental approach was adopted before simulated beam stiffness for the species population was derived. Firstly, a number of probability functions representing the actual distribution of selected timber data were examined. Goodness-offit (GOF) analysis was then carried out to establish the best fitting distribution function for the experimental data used.Secondly, the modulus of elasticity (MOE) of solid and finger-jointed samples was obtained from non-destructive testing (NDT) using the fundamental vibration frequency methodology. Results from the above method were calibrated against those obtained through static bending test by means of Universal Testing Machine. Finally, glued-laminated timber (glulam) beams were fabricated using laminations with predetermined MOEs by NDT method and the beams were later subjected to 3-point static bending test for MOE determination.In the mean time, finite element method (FEM) coupled with transformed section approach, was also used to simulate the glulam beam tests after experimental length effect was incorporated.The MOE of beams population was then predicted using randomly generated MOE and length data.The GOF analysis indicates that 3-parameter Weibull distribution best fit the probability distribution of the tested timber. Results from the NDT method also showed a good relationship between the fundamental vibration frequency test and the static bending test conducted with a coefficient of determination of about 0.89. In the simulation of glulam beams, the MOE values of simulated glulam beams are generally higher than the actual tests conducted, particularly in durian hutan, with a percentage difference of about 23%.In the prediction of the MOE glulam beams population, the generated distribution exhibits higher MOE values compared to the average value reported respectively for durian hutan and rubberwood species
format	Thesis
qualification_level	Master's degree
author	Ong, Chee Beng
author_facet	Ong, Chee Beng
author_sort	Ong, Chee Beng
title	Prediction of Beam Stiffness for Structural Glued laminated Timber
title_short	Prediction of Beam Stiffness for Structural Glued laminated Timber
title_full	Prediction of Beam Stiffness for Structural Glued laminated Timber
title_fullStr	Prediction of Beam Stiffness for Structural Glued laminated Timber
title_full_unstemmed	Prediction of Beam Stiffness for Structural Glued laminated Timber
title_sort	prediction of beam stiffness for structural glued laminated timber
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Forestry
publishDate	2004
url	http://psasir.upm.edu.my/id/eprint/248/1/549493_FH_2004_6.pdf
_version_	1747810183747207168

Prediction of Beam Stiffness for Structural Glued laminated Timber

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