Moisture content and moisture-induced stresses of large glulam members: laboratory tests, in-situ measurements and modelling

Franke, Bettina; Franke, Steffen; Schiere, Marcus Jacob; Müller, Andreas (2019). Moisture content and moisture-induced stresses of large glulam members: laboratory tests, in-situ measurements and modelling Wood Material Science & Engineering, 14(4), pp. 243-252. Taylor & Francis 10.1080/17480272.2018.1551930

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Wood as a hygroscopic material interacts with the ambient climate variations of relative humidity and temperature. Due to constrained volumetric strains, i.e. swelling and shrinkage, changes in moisture content impose moisture induced stresses (MIS) which, if exceeding the tensile stress of the material, can cause fractures such as cracks or delamination. A monitoring campaign was initiated to measure the variations of the climate and moisture content in existing timber bridges and newly erected structure. Additionally, experimental test series under laboratory conditions were performed. Finally, the moisture induced mechanical response was simulated using a coupled moisture diffusion and mechanical model. The measuring results support the choice of the known service classes depending on the user service resp. building type. On the other hand, a possible differentiation of the service class over the cross section is discussed according to measuring results and practical applications. Cross sections are classified regarding the assumed ambient climate in service by numerical simulations developing the moisture content and gradient over the cross section.

Item Type:

Journal Article (Original Article)

Division/Institute:

Architecture, Wood and Civil Engineering
Architecture, Wood and Civil Engineering > Institute for Timber Construction, Structures and Architecture

Name:

Franke, Bettina;
Franke, Steffen;
Schiere, Marcus Jacob and
Müller, Andreas

Subjects:

Q Science > QD Chemistry
Q Science > QK Botany

ISSN:

1748-0272

Publisher:

Taylor & Francis

Language:

English

Submitter:

Steffen Franke

Date Deposited:

04 Dec 2019 11:11

Last Modified:

09 Dec 2019 10:57

Publisher DOI:

10.1080/17480272.2018.1551930

Uncontrolled Keywords:

Moisture content Wood Monitoring Simulation Internal stresses

URI:

https://arbor.bfh.ch/id/eprint/6711

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