Climate impact on reinforcements in wooden members: effective hygro-expansion coefficients

Franke, Bettina; Franke, Steffen; Schiere, Marcus (2022). Climate impact on reinforcements in wooden members: effective hygro-expansion coefficients Wood Material Science & Engineering, 17(4), pp. 299-308. Taylor & Francis 10.1080/17480272.2022.2086821

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Wood is a hygroscopic material. The moisture content changes due to ambient climate variations e.g. according to erection and service time. The moisture content adapts first on the surface, and moisture gradient develop over the cross section and results in moisture induced stresses (MIS). MIS occur in addition to normal stresses for the load-bearing resistance and can affect reinforcements. To achieve a reliable evaluation of the safety level of reinforced timber structures, the present paper shows results from experimental test series on the load, moisture, and deformation investigation of structural glulam members reinforced with internal mechanical fasteners. Stepwise climate scenarios were applied and considered climates experienced by the structural timber member before or after reinforcement. For the estimation of the swelling and shrinkage behaviour, effective hygro-expansion coefficients have been determined. The coefficients are significantly lower than previously assumed in the standards. This enables engineers to estimate the impact on reinforcements which is not neglectable and reduces damage in a wide range of applications. The research results promote the use of wood by ensuring quality, performance, and aesthetics in timber constructions.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Architecture, Wood and Civil Engineering School of Architecture, Wood and Civil Engineering > Institute for Timber Construction, Structures and Architecture School of Architecture, Wood and Civil Engineering > Institute for Timber Construction, Structures and Architecture > Timber Construction BFH Centres and strategic thematic fields > BFH Centre for Wood - Resource and Material School of Architecture, Wood and Civil Engineering > Institute for Timber Construction IHB School of Architecture, Wood and Civil Engineering > Institute for Timber Construction IHB > Timber Structures group FGH
Name:	Franke, Bettina0000-0002-8087-9347; Franke, Steffen0000-0003-2430-8491 and Schiere, Marcus
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
ISSN:	1748-0272
Publisher:	Taylor & Francis
Language:	English
Submitter:	Bettina Franke
Date Deposited:	10 Jan 2023 15:02
Last Modified:	21 Jun 2023 11:27
Publisher DOI:	10.1080/17480272.2022.2086821
Uncontrolled Keywords:	Wood; reinforcement; moisture impact; hygro- expansion coefficient; simulation and experiment
ARBOR DOI:	10.24451/arbor.18482
URI:	https://arbor.bfh.ch/id/eprint/18482