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Title:	Modalanalyse von Monitoringdaten eines Sendeturms
Abstract:	Im Rahmen des DFG Graduiertenkollegs 1462 wurde an einem ca. 200 m hohen Sendeturm mit rotationssymmetrischem Querschnitt ein Monitoringsystem zur Erfassung von Schwingbeschleunigungen, Temperaturen und Windeinwirkungen installiert, welches über einen Zeitraum von zwei Jahren betrieben wurde. Die Auswertung der Schwingungsdaten erfolgte mithilfe einer automatisierten Output-only-Modalanalyse. In der vorliegenden Studie wurde die Stochastic-Subspace-Identification-Methode in Verbindung mit einem automatischen, dreistufigen Clustering-Algorithmus zur Identifikation der modalen Parameter und deren Varianzen verwendet. Es wurden Abhängigkeiten der modalen Parameter von den Umgebungsbedingungen unter Berücksichtigung der Unsicherheiten aller Datenpunkte ermittelt. Bei ideal rotationssymmetrischen Bauwerksquerschnitten treten alle Eigenschwingungen paarweise mit orthogonal zueinander stehenden Eigenformen auf. In realen Systemen ergeben sich aus diesen doppelten Eigenformen paarweise kombinierte Eigenformen mit eng beieinanderliegenden Eigenfrequenzen. Die Hauptschwingungsrichtungen dieser Eigenformen wurden ermittelt und in Beziehung zur Windrichtung betrachtet. Operational Modal Analysis of monitoring data of a telecommunication tower In the framework of the DFG research training group, a monitoring system was installed on a telecommunication tower with a height of approximately 200 m and a rotationally symmetric cross section. Its main purpose was the acquisition of vibratory accelerations, temperatures and wind actions and it was operated for two years. The analysis of the vibration data was done by means of an automated Operational Modal Analysis. In the presented study, the Stochastic Subspace Identification method in conjunction with a three-stage clustering algorithm was used to automatically estimate the modal parameters and their variances. Several relations of the modal parameters with the environmental conditions were identified and rendered more precisely by considering the uncertainties of all data points. In structures with an ideal rotationally symmetric cross-section, all vibrational modes appear in pairs with orthogonally oriented mode shapes. In real-world systems pairwise combined mode shapes with closely-spaced natural frequencies result from the associated modes. The main directions of vibration of these mode shapes were identified and related to the wind directions.
Source:	Bautechnik 95 (2018), No. 4
Page/s:	288-295
Language of Publication:	German

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