東華大學圖書館 |

A Characterization of Fungal Degradation Effects on Wood Structures: Multi-Scale Model of Decayed Wood From the Polymer to Structural Scales /

Record Type:	Electronic resources : Monograph/item
Title/Author:	A Characterization of Fungal Degradation Effects on Wood Structures: Multi-Scale Model of Decayed Wood From the Polymer to Structural Scales // Garrett A Tatum.
Author:	Tatum, Garrett A.,
Description:	1 electronic resource (160 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
Contained By:	Dissertations Abstracts International86-04B.
Subject:	Mechanics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31673972
ISBN:	9798384088189

A Characterization of Fungal Degradation Effects on Wood Structures: Multi-Scale Model of Decayed Wood From the Polymer to Structural Scales /
Tatum, Garrett A.,

A Characterization of Fungal Degradation Effects on Wood Structures: Multi-Scale Model of Decayed Wood From the Polymer to Structural Scales /Garrett A Tatum. - 1 electronic resource (160 pages)

Source: Dissertations Abstracts International, Volume: 86-04, Section: B.

Wood is the primary material used in residential construction in the United States. Further, new "mass timber" wood products are enabling construction of taller wood structures and are rapidly gaining market share in new construction. Because wood sequesters carbon as it grows, timber construction is an important tool in achieving a zero-carbon construction industry. However, timber structures are uniquely vulnerable to biological attack from fungus and insects. The increasing frequency and severity of hurricanes and floods due to climate change provides the optimal conditions for wood decay in structures by driving moisture inside buildings. Low-income and minoritized populations are the most likely to experience long-term effects from these hazards due to their location in hazard-prone regions and/or proximity to the floodplain. Consequently, these residents may disproportionately experience biological attack of their homes, creating long-term health disparities and potentially affecting the strength of the structure. To address these issues, it is critical to develop tools that quantify the effects of biodeterioration within timber structures. This research presents a first-of-its kind effort to quantify wood degradation effects on timber structures through experimental and numerical approaches.First, the changes in wood composition, physical properties, and stiffness were measured experimentally throughout fungal attack via thermogravimetric analysis, physical observations, and ultrasonic pulse velocity. This study investigated Southern Yellow Pine, the most common species of lumber used in the Southeast United States, under attack from Meruliporia incrassata, a common brown rot fungus. The study found stiffness losses of over 30% and density losses over 10% during a 12-week decay period. Such significant stiffness losses indicate that a building component with decayed wood could experience much greater deflections and damage than an undecayed component under the same loading. These changes were noted to occur after only 2-4 weeks of decay, indicating that significant deterioration of structural members can occur within the time of recovery from a natural hazard and that faster remediation can lessen long-term impacts.Next, these data were utilized as inputs for a multi-scale material model that quantifies the effects of fungal attack on wood mechanical properties. Wood has unique structural features depending on the length-scale considered. Using the volume fractions and mass loss determined in the experimental study, this model captured the mechanical effects of decay on each of these structures through homogenization techniques. This model applies cutting edge wood science studies that characterize how decay occurs to a new mechanical model, characterizing how decay changes wood structures at each scale.Finally, decayed wood stiffness properties were deployed in a finite element model of a window-wall structural assembly to characterize the effects of wood decay on these assemblies under design-level loading. Initial analyses predicted greater deflections and damage from applied loads in structural assemblies with decayed wood elements. This finding demonstrates that timber structures exposed to wood degrading fungus are more vulnerable to damage during high winds and may be more likely to fail in future hazard events.While timber construction is essential to minimizing carbon emissions from construction, wood is susceptible to biological attack. Due to climate change impacts on natural hazards, biodeterioration may disproportionately affect minoritized populations. This study characterized the impacts of fungal attack on wood material properties and structural assemblies, the first step in quantifying the risk to these communities. Future work should characterize the impacts of wood degradation on post-hazard housing access and consider policy initiatives to rapidly deploy resources to remediate homes post-hazard and minimize long-term impacts on vulnerable communities.

English

ISBN: 9798384088189Subjects--Topical Terms:

525881
Mechanics.
Subjects--Index Terms:

Wood structures

A Characterization of Fungal Degradation Effects on Wood Structures: Multi-Scale Model of Decayed Wood From the Polymer to Structural Scales /
LDR:05617nmm a22004573i 4500 001 2428643
005 20250414021922.5
006 m o d
007 cr|nu||||||||
008 261011s2024 miu||||||m |||||||eng d
020 $a 9798384088189
035 $a (MiAaPQD)AAI31673972
035 $a AAI31673972
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Tatum, Garrett A., $e author. $3 3815996
245 1 2 $a A Characterization of Fungal Degradation Effects on Wood Structures: Multi-Scale Model of Decayed Wood From the Polymer to Structural Scales / $c Garrett A Tatum.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (160 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
500 $a Advisors: Brenkus, Natassia R. Committee members: Shafieezadeh, Abdollah; Burris, Lisa; Best, Kelsea.
502 $b Ph.D. $c The Ohio State University $d 2024.
520 $a Wood is the primary material used in residential construction in the United States. Further, new "mass timber" wood products are enabling construction of taller wood structures and are rapidly gaining market share in new construction. Because wood sequesters carbon as it grows, timber construction is an important tool in achieving a zero-carbon construction industry. However, timber structures are uniquely vulnerable to biological attack from fungus and insects. The increasing frequency and severity of hurricanes and floods due to climate change provides the optimal conditions for wood decay in structures by driving moisture inside buildings. Low-income and minoritized populations are the most likely to experience long-term effects from these hazards due to their location in hazard-prone regions and/or proximity to the floodplain. Consequently, these residents may disproportionately experience biological attack of their homes, creating long-term health disparities and potentially affecting the strength of the structure. To address these issues, it is critical to develop tools that quantify the effects of biodeterioration within timber structures. This research presents a first-of-its kind effort to quantify wood degradation effects on timber structures through experimental and numerical approaches.First, the changes in wood composition, physical properties, and stiffness were measured experimentally throughout fungal attack via thermogravimetric analysis, physical observations, and ultrasonic pulse velocity. This study investigated Southern Yellow Pine, the most common species of lumber used in the Southeast United States, under attack from Meruliporia incrassata, a common brown rot fungus. The study found stiffness losses of over 30% and density losses over 10% during a 12-week decay period. Such significant stiffness losses indicate that a building component with decayed wood could experience much greater deflections and damage than an undecayed component under the same loading. These changes were noted to occur after only 2-4 weeks of decay, indicating that significant deterioration of structural members can occur within the time of recovery from a natural hazard and that faster remediation can lessen long-term impacts.Next, these data were utilized as inputs for a multi-scale material model that quantifies the effects of fungal attack on wood mechanical properties. Wood has unique structural features depending on the length-scale considered. Using the volume fractions and mass loss determined in the experimental study, this model captured the mechanical effects of decay on each of these structures through homogenization techniques. This model applies cutting edge wood science studies that characterize how decay occurs to a new mechanical model, characterizing how decay changes wood structures at each scale.Finally, decayed wood stiffness properties were deployed in a finite element model of a window-wall structural assembly to characterize the effects of wood decay on these assemblies under design-level loading. Initial analyses predicted greater deflections and damage from applied loads in structural assemblies with decayed wood elements. This finding demonstrates that timber structures exposed to wood degrading fungus are more vulnerable to damage during high winds and may be more likely to fail in future hazard events.While timber construction is essential to minimizing carbon emissions from construction, wood is susceptible to biological attack. Due to climate change impacts on natural hazards, biodeterioration may disproportionately affect minoritized populations. This study characterized the impacts of fungal attack on wood material properties and structural assemblies, the first step in quantifying the risk to these communities. Future work should characterize the impacts of wood degradation on post-hazard housing access and consider policy initiatives to rapidly deploy resources to remediate homes post-hazard and minimize long-term impacts on vulnerable communities.
546 $a English
590 $a School code: 0168
650 4 $a Mechanics. $3 525881
650 4 $a Sustainability. $3 1029978
650 4 $a Wood sciences. $3 3168288
653 $a Wood structures
653 $a Durability
653 $a Micromechanics
653 $a Resilience
653 $a Multi-scale model
653 $a Biodeterioration
690 $a 0346
690 $a 0640
690 $a 0543
690 $a 0746
710 2 $a The Ohio State University. $b Civil Engineering. $e degree granting institution. $3 3815995
720 1 $a Brenkus, Natassia R. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-04B.
790 $a 0168
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31673972