Case studies: long term monitoring of timber bridges.

Franke, Bettina; Franke, Steffen; Müller, Andreas (2015). Case studies: long term monitoring of timber bridges. Journal of Civil Structural Health Monitoring, 5(2), pp. 195-202. Springer 10.1007/s13349-014-0093-4

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Timber bridges are subjected to climatic changes respectively cycles which result, due to the hygroscopic material behavior, in a change of the moisture content in the wood and thus change of dimensions of the wooden elements. But there is still missing knowledge about the impact of the climatic changes. Thus, the objective was to investigate the material behavior due to climatic changes regarding the moisture content and dimensional changes in relation to the natural material axes and within the cross section. Therefore different traffic timber bridges with big cross sections were long-term monitored within a research project. The results of the moisture contents measured and a comparison between the different measuring points as groups and at different positions are presented. The results confirm that the wood moisture content follows the climatic changes delayed and with smaller amplitude compared to the calculated equilibrium moisture content. It was observed that the change of the moisture content differs over the cross section and along the span of the members. Moreover, due to the monitoring systems, a damage of the bridge could be detected at an early stage and further damage could be prevented.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Architecture, Wood and Civil Engineering
Name:	Franke, Bettina0000-0002-8087-9347; Franke, Steffen0000-0003-2430-8491 and Müller, Andreas
ISSN:	2190-5452
Publisher:	Springer
Language:	English
Submitter:	Steffen Franke
Date Deposited:	10 Dec 2019 09:25
Last Modified:	19 Oct 2021 21:45
Publisher DOI:	10.1007/s13349-014-0093-4
ARBOR DOI:	10.24451/arbor.5560
URI:	https://arbor.bfh.ch/id/eprint/5560