Measurement and prediction of lateral torsional buckling loads of composite wood materials: Rectangular sections

Daniel P. Hindman, Harvey B. Manbeck, John J. Janowiak

Research output: Contribution to journalReview article

12 Citations (Scopus)

Abstract

Differences in the elastic constant ratios and torsional rigidity between solid wood and structural composite lumber may result in differences of the lateral torsional buckling behavior of these materials. The experimental critical buckling loads (CBLs) determined from a cantilever beam test method were compared with CBL predictions based upon the load resistance factor equations for wood design and modifications to the design equations incorporating measured E:G ratios and measured torsional rigidity terms. Experimental materials included machine-stress-rated lumber, laminated veneer lumber (LVL), parallel strand lumber (PSL), and laminated strand lumber (LSL) tested at three different lengths. The current LRFD equations best predicted the CBL values for solid wood and the PSL, but predicted nonconservative CBL values for the LVL. The current LRFD equation modified to incorporate measured E:G ratios was the best predictor for the LVL and LSL materials tested and represented no improvement in CBL prediction for the solid-sawn lumber and PSL. The incorporation of the measured torsional rigidity term did not significantly enhance any of the CBL predictions. The modeling of the test specimens as isotropic materials produced more agreeable CBL predictions than use of the measured torsional rigidity values. Therefore, the current LRFD equations are verified for solid-sawn lumber and recommended for use with PSL. The LRFD equations incorporating the material specific E:G ratios are recommended for LVL and LSL to provide more accurate CBL predictions.

Original languageEnglish (US)
Article number9855
Pages (from-to)42-47
Number of pages6
JournalForest Products Journal
Volume55
Issue number9
StatePublished - Sep 1 2005

Fingerprint

Lumber
buckling
lumber
Buckling
Wood
laminated veneer lumber
prediction
Composite materials
rigidity
Veneers
Rigidity
machine stress-rated lumber
critical load
material
testing
R Factors
Cantilever beams
Elastic constants

All Science Journal Classification (ASJC) codes

  • Forestry
  • Materials Science(all)
  • Plant Science

Cite this

Hindman, Daniel P. ; Manbeck, Harvey B. ; Janowiak, John J. / Measurement and prediction of lateral torsional buckling loads of composite wood materials : Rectangular sections. In: Forest Products Journal. 2005 ; Vol. 55, No. 9. pp. 42-47.
@article{37e05d403aac446f8b4a3500a585a31a,
title = "Measurement and prediction of lateral torsional buckling loads of composite wood materials: Rectangular sections",
abstract = "Differences in the elastic constant ratios and torsional rigidity between solid wood and structural composite lumber may result in differences of the lateral torsional buckling behavior of these materials. The experimental critical buckling loads (CBLs) determined from a cantilever beam test method were compared with CBL predictions based upon the load resistance factor equations for wood design and modifications to the design equations incorporating measured E:G ratios and measured torsional rigidity terms. Experimental materials included machine-stress-rated lumber, laminated veneer lumber (LVL), parallel strand lumber (PSL), and laminated strand lumber (LSL) tested at three different lengths. The current LRFD equations best predicted the CBL values for solid wood and the PSL, but predicted nonconservative CBL values for the LVL. The current LRFD equation modified to incorporate measured E:G ratios was the best predictor for the LVL and LSL materials tested and represented no improvement in CBL prediction for the solid-sawn lumber and PSL. The incorporation of the measured torsional rigidity term did not significantly enhance any of the CBL predictions. The modeling of the test specimens as isotropic materials produced more agreeable CBL predictions than use of the measured torsional rigidity values. Therefore, the current LRFD equations are verified for solid-sawn lumber and recommended for use with PSL. The LRFD equations incorporating the material specific E:G ratios are recommended for LVL and LSL to provide more accurate CBL predictions.",
author = "Hindman, {Daniel P.} and Manbeck, {Harvey B.} and Janowiak, {John J.}",
year = "2005",
month = "9",
day = "1",
language = "English (US)",
volume = "55",
pages = "42--47",
journal = "Forest Products Journal",
issn = "0015-7473",
publisher = "Forest Products Society",
number = "9",

}

Measurement and prediction of lateral torsional buckling loads of composite wood materials : Rectangular sections. / Hindman, Daniel P.; Manbeck, Harvey B.; Janowiak, John J.

In: Forest Products Journal, Vol. 55, No. 9, 9855, 01.09.2005, p. 42-47.

Research output: Contribution to journalReview article

TY - JOUR

T1 - Measurement and prediction of lateral torsional buckling loads of composite wood materials

T2 - Rectangular sections

AU - Hindman, Daniel P.

AU - Manbeck, Harvey B.

AU - Janowiak, John J.

PY - 2005/9/1

Y1 - 2005/9/1

N2 - Differences in the elastic constant ratios and torsional rigidity between solid wood and structural composite lumber may result in differences of the lateral torsional buckling behavior of these materials. The experimental critical buckling loads (CBLs) determined from a cantilever beam test method were compared with CBL predictions based upon the load resistance factor equations for wood design and modifications to the design equations incorporating measured E:G ratios and measured torsional rigidity terms. Experimental materials included machine-stress-rated lumber, laminated veneer lumber (LVL), parallel strand lumber (PSL), and laminated strand lumber (LSL) tested at three different lengths. The current LRFD equations best predicted the CBL values for solid wood and the PSL, but predicted nonconservative CBL values for the LVL. The current LRFD equation modified to incorporate measured E:G ratios was the best predictor for the LVL and LSL materials tested and represented no improvement in CBL prediction for the solid-sawn lumber and PSL. The incorporation of the measured torsional rigidity term did not significantly enhance any of the CBL predictions. The modeling of the test specimens as isotropic materials produced more agreeable CBL predictions than use of the measured torsional rigidity values. Therefore, the current LRFD equations are verified for solid-sawn lumber and recommended for use with PSL. The LRFD equations incorporating the material specific E:G ratios are recommended for LVL and LSL to provide more accurate CBL predictions.

AB - Differences in the elastic constant ratios and torsional rigidity between solid wood and structural composite lumber may result in differences of the lateral torsional buckling behavior of these materials. The experimental critical buckling loads (CBLs) determined from a cantilever beam test method were compared with CBL predictions based upon the load resistance factor equations for wood design and modifications to the design equations incorporating measured E:G ratios and measured torsional rigidity terms. Experimental materials included machine-stress-rated lumber, laminated veneer lumber (LVL), parallel strand lumber (PSL), and laminated strand lumber (LSL) tested at three different lengths. The current LRFD equations best predicted the CBL values for solid wood and the PSL, but predicted nonconservative CBL values for the LVL. The current LRFD equation modified to incorporate measured E:G ratios was the best predictor for the LVL and LSL materials tested and represented no improvement in CBL prediction for the solid-sawn lumber and PSL. The incorporation of the measured torsional rigidity term did not significantly enhance any of the CBL predictions. The modeling of the test specimens as isotropic materials produced more agreeable CBL predictions than use of the measured torsional rigidity values. Therefore, the current LRFD equations are verified for solid-sawn lumber and recommended for use with PSL. The LRFD equations incorporating the material specific E:G ratios are recommended for LVL and LSL to provide more accurate CBL predictions.

UR - http://www.scopus.com/inward/record.url?scp=27144518051&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=27144518051&partnerID=8YFLogxK

M3 - Review article

AN - SCOPUS:27144518051

VL - 55

SP - 42

EP - 47

JO - Forest Products Journal

JF - Forest Products Journal

SN - 0015-7473

IS - 9

M1 - 9855

ER -