TY - CHAP U1 - Konferenzveröffentlichung A1 - Hamm, Patricia A1 - Schänzlin, Jörg A1 - Francke, Wolfgang A1 - Scheuble, Stefan T1 - Monitoring of timber bridges by repeatedly measuring the natural frequency T2 - WCTE 2016 : World Conference on Timber Engineerng : August 22-25, 2016, Vienna, Austria N2 - Measuring the natural frequency of buildings and bridges is a possibility to get information about the stiffness of the construction. Decreasing stiffness can be detected be repeatedly measurements. Damaged parts of the construction or too high wood moisture can be reasons for decreasing stiffness. The earlier the failure is detected the better is the chance to repair it with low costs. The method of monitoring by repeatedly measuring the natural frequency is applied at timber bridges, especially on footbridges. As damages due to high wood moisture cannot be seen easily, measuring the natural frequency is a good possibility to detect them and then to repair them. Equations to calculate the natural frequencies regarding the damaged parts are shown and applied to a simple supported beam. KW - Measurements KW - Natural frequency KW - Timber bridges KW - Footbridges KW - Damages Y1 - 2016 UR - https://www.hochschule-biberach.de/sites/default/files/medien/dokumente/WCTE%202016%20Hamm%20Scha%CC%88nzlin.pdf SN - 978-3-903039-00-1 SB - 978-3-903039-00-1 SP - 4676 EP - 4683 PB - Technische Universität Wien CY - Wien ER -