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Analytical and Experimental Evaluati...

Cao, Yawei.

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Analytical and Experimental Evaluation of the Effect of Knots on Rolling Shear Properties of Cross-Laminated Timber (CLT).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Analytical and Experimental Evaluation of the Effect of Knots on Rolling Shear Properties of Cross-Laminated Timber (CLT)./
Author:	Cao, Yawei.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	125 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
Contained By:	Dissertations Abstracts International80-12B.
Subject:	Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13856287
ISBN:	9781392172674

Analytical and Experimental Evaluation of the Effect of Knots on Rolling Shear Properties of Cross-Laminated Timber (CLT).
Cao, Yawei.

Analytical and Experimental Evaluation of the Effect of Knots on Rolling Shear Properties of Cross-Laminated Timber (CLT). - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 125 p.

Source: Dissertations Abstracts International, Volume: 80-12, Section: B.

Thesis (Ph.D.)--Mississippi State University, 2019.

This item is not available from ProQuest Dissertations & Theses.

Knots are usually regarded as defects when grading lumber. In order to evaluate a member under out-of-plane loading, shear strength is one of the major mechanical properties, specifically, rolling shear (RS) strength is one of the critical mechanical properties of Cross-Laminated Timber (CLT), which determines the flexural strength of CLT under short-span bending loads. Lower grade lumber with a higher percentage of knots is recommended to be utilized for the cross-layer laminations which are mainly responsible for resisting shear stresses. Firstly, shear tests were performed in order to evaluate the effect of knots on longitudinal shear strength using shear blocks. After that, the effect of knots on the RS strength of 3-ply southern yellow pine CLT were investigated by experimental tests and an analytical model. Center-point bending tests with a span-to-depth ratio of 6 and two-plate shear tests with a loading angle of 14° were conducted on six CLT configurations composed of different types of cross layer laminations: clear flatsawn lumber with/without pith, lumber with sound knots with/without pith, and lumber with decayed knots with/without pith. The shear analogy method was implemented to evaluate the RS strength values from the bending test results, which were also compared against the results from the two-plate shear tests. It was found that: (1) The shear blocks containing sound knots had higher shear strength than matched clear shear blocks, the shear blocks containing unsound knots had lower shear strength than the matched clear shear blocks. (2) CLT specimens with cross-layer laminations with either sound knots or decayed knots had higher RS strength. (3) In general, the shear analogy method underestimated the RS strength of CLT specimens containing knots and pith.

ISBN: 9781392172674Subjects--Topical Terms:

525881
Mechanics.
Subjects--Index Terms:

Cross laminated timber

Analytical and Experimental Evaluation of the Effect of Knots on Rolling Shear Properties of Cross-Laminated Timber (CLT).
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245 1 0 $a Analytical and Experimental Evaluation of the Effect of Knots on Rolling Shear Properties of Cross-Laminated Timber (CLT).
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 125 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Street, Jason T.;DuBien, Janice.
502 $a Thesis (Ph.D.)--Mississippi State University, 2019.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a Knots are usually regarded as defects when grading lumber. In order to evaluate a member under out-of-plane loading, shear strength is one of the major mechanical properties, specifically, rolling shear (RS) strength is one of the critical mechanical properties of Cross-Laminated Timber (CLT), which determines the flexural strength of CLT under short-span bending loads. Lower grade lumber with a higher percentage of knots is recommended to be utilized for the cross-layer laminations which are mainly responsible for resisting shear stresses. Firstly, shear tests were performed in order to evaluate the effect of knots on longitudinal shear strength using shear blocks. After that, the effect of knots on the RS strength of 3-ply southern yellow pine CLT were investigated by experimental tests and an analytical model. Center-point bending tests with a span-to-depth ratio of 6 and two-plate shear tests with a loading angle of 14° were conducted on six CLT configurations composed of different types of cross layer laminations: clear flatsawn lumber with/without pith, lumber with sound knots with/without pith, and lumber with decayed knots with/without pith. The shear analogy method was implemented to evaluate the RS strength values from the bending test results, which were also compared against the results from the two-plate shear tests. It was found that: (1) The shear blocks containing sound knots had higher shear strength than matched clear shear blocks, the shear blocks containing unsound knots had lower shear strength than the matched clear shear blocks. (2) CLT specimens with cross-layer laminations with either sound knots or decayed knots had higher RS strength. (3) In general, the shear analogy method underestimated the RS strength of CLT specimens containing knots and pith.
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650 4 $a Mechanics. $3 525881
650 4 $a Civil engineering. $3 860360
650 4 $a Wood sciences. $3 3168288
653 $a Cross laminated timber
653 $a Failure mechanism
653 $a Knot
653 $a Rolling shear
653 $a Shear analogy method
653 $a Southern yellow pine
690 $a 0346
690 $a 0543
690 $a 0746
710 2 $a Mississippi State University. $b Forest Products. $3 1262979
773 0 $t Dissertations Abstracts International $g 80-12B.
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791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13856287