https://opara.zih.tu-dresden.de/xmlui/handle/123456789/5948 Beton weist unter zyklischen Lasten ein komplexes Verformungsverhalten auf. Dieses beeinflusst die Spannungsverteilung auf der Querschnittsebene von Betonbauteilen und wirkt sich positiv auf deren Lebensdauer aus. Das normative Ermüdungsnachweiskonzept prognostiziert die Lebensdauer von Betonbauteilen auf der Grundlage von Wöhlerlinien. Die Verformungsentwicklung des Betons und die Spannungsumlagerungen auf der Querschnittsebene finden nahezu keine Berücksichtigung, wodurch ermüdungsbeanspruchte Betonbauwerke gemäß dem derzeitigen Nachweiskonzept nicht wirtschaftlich bemessen werden.Das Ziel des Forschungsvorhabens ist das Verformungsverhalten und im speziellen die Spannungsumlagerungen von ermüdungsbeanspruchten Betonbauteilen zu untersuchen. In diesem Rahmen werden sowohl FE-Simulationen als auch experimentelle Versuche durchgeführt. Für die Simulationen wird ein am Institut für Massivbau der Leibniz Universität Hannover entwickeltes Dehnungsmodell für ermüdungsbeanspruchten Beton zugrunde gelegt. Die experimentellen Untersuchungen werden auf dem Resonanzversuchstand des Instituts durchgeführt. Dieser weltweit einmalige Versuchsstand ermöglicht die Untersuchung von Betonbalken im Very High Cycle Fatigue-Bereich, also bis in einen Lastwechselbereich von mehr als 1•10^7 Lastwechseln. Dies ist für die Versuchsdurchführung von wesentlicher Bedeutung, da die Spannungsumlagerungen sehr hohe, ertragbare Lastwechselzahlen bei den Betonbalken bedingen.Die numerischen Simulationen werden anhand der experimentellen Untersuchungen verifiziert. Auf dieser Grundlage können allgemeingültige Aussagen zu dem Verformungsverhalten und den Spannungsumlagerungen von ermüdungsbeanspruchten Betonbauteilen getroffen werden sowie neue Bemessungsvorschläge formuliert werden. Die Erkenntnisse des Vorhabens dienen der Bemessung dynamisch beanspruchter Bauwerke wie Windenergieanlagen oder Eisenbahnbrücken des Hochgeschwindigkeitsverkehrs. Sie ermöglichen den Schritt in Richtung einer realitätsnäheren Bemessung und damit schlankeren, wirtschaftlicheren und kostengünstigeren Ausführung von ermüdungsbeanspruchten Betonbauwerken. 2026-04-05T23:14:21Z https://opara.zih.tu-dresden.de/xmlui/handle/123456789/6125 Raw data of the cyclic tests on the beam specimens Birkner, Dennis This dataset contains the raw data of the cyclic tests on the beam specimens. Two concrete mixes were investigated (C30 and C80). The specimens are named with the concrete type followed by a roman number (e.g. C30-II). The specimens were loaded with a sinusoidal load, oscillating between a relative minimum and a maximum load level. The minimum load level was aimed to be 5% of the compressive strength and the maximum load level 75%. An exception was beam C80-VI. A maximum load level of 65 % was chosen here. Each beam was from a different concrete batch and for determining the compressive strength of the respective concrete batch, three cyclindrical specimens were cast together with each beam. Before starting the beam test, the compressive strength was determined on the cylindrical specimens. In a first step, the beams were prestressed. Afterwards a vertical prestressing was applied to achieve a mean loading in the specimens. In the third step, the fatigue test was started. The Layout of all sensors is provided in a separate file here. The data of the sensors can be found in .ASC files. Following channels are used in each file: Zeit 1 (Standardmessrate) [time 1 (standard measuring rate)] in s, DMS_1 [strain gage 1] in micrometer/m, DMS_2 [strain gage 2] in micrometer/m, DMS_3 [strain gage 3] in micrometer/m, DMS_4 [strain gage 4] in micrometer/m, DMS_5 [strain gage 5] in micrometer/m, DMS_6 [strain gage 6] in micrometer/m, DMS_7 [strain gage 7] in micrometer/m, DMS_8 [strain gage 8] in micrometer/m, DMS_9 [strain gage 9] in micrometer/m, DMS_10 [strain gage 10] in micrometer/m, DMS_11 [strain gage 11] in micrometer/m, DMS_12 [strain gage 12] in micrometer/m, DMS_13 [strain gage 13] in micrometer/m, DMS_14 [strain gage 14] in micrometer/m, DMS-Komp [strain gage for temperature compensation] in micrometer/m, Zeit 2 (Standardmessrate) [time 2 (standard measuring rate)] in s, DMS-q-west [strain gage transversal, west side] in micrometer/m, DMS-q-ost [strain gage transversal, east side] in micrometer/m, Zeit 3 (Standardmessrate) [time 3 (standard measuring rate)] in s, Zeit 3 (langsame Messrate) [time 3 (slow measuring rate)] in s, Auflager_1 [support force 1] in kN, Auflager_2 [support force 2] in kN, Auflager_3 [support force 3] in kN, Auflager_4 [support force 4] in kN, Temp4 [temperature 4] in °C, Temp3 [temperature 3] in °C, Temp2 [temperature 2] in °C, Temp1 [temperature 1] in °C, Zeit 5 (Standardmessrate) [time 5 (standard measuring rate)] in s, Nord_Vorspannen [prestressing force northern threaded rod] in kN, Süd_Vorspannen [prestressing force southernthreaded rod] in kN, Öldruck Zylinder [hydraulik pressure of prestressing cylinder] in kN, Temp-Luft [ambient temperature] in °C, Summe Auflager [sum of support forces] in kN The fatigue load was applied by beams of imbalance motors which were regulateded by a control software. The data from the control software can be found in the .CSV files. Following channels are used in these files: Zeit [time] in s, Soll-Drehzahl [target frequency] in Hz, Ist-Amplitude Regelwert [current force oscillation] in kN, Ist-Drehzahl Motor 1 [current frequency of motor 1] in Hz, Ist-Drehzahl Motor 2 [current frequency of motor 2] in Hz, Ist-Drehzahl Motor 3 [current frequency of motor 3] in Hz, Ist-Drehzahl Motor 4 [current frequency of motor 4] in Hz, Ist-Phasenversatz M1-M2 [current phase offset betweeen motor 1 and motor 2] in °, Ist-Phasenversatz M1-M3 [current phase offset betweeen motor 1 and motor 3] in °, Ist-Phasenversatz M1-M4 [current phase offset betweeen motor 1 and motor 4] in °, Lastwechsel [load cycles], AI0 [reaction force 1] in kN, AI1 [reaction force 2] in kN, AI2 [reaction force 3] in kN, AI3 [reaction force 4] in kN, AI0 RMS [current average force oscillation of the supports] in kN For some beam specimens multiple runs were needed to achieve fatigue failure because of unplanned stops of the imbalance motors. The data files of these runs are named X_Run01...X-Run02 accordingly. 2024-01-01T00:00:00Z https://opara.zih.tu-dresden.de/xmlui/handle/123456789/6035 Raw data of the cyclic tests on the cylindrical specimens Birkner, Dennis This dataset contains the raw data of the cyclic tests on concrete cylinders to determine the number of cycles to failure and the stiffness develpment of the different batches. Two concrete mixes were investigated (C30 and C80). The batch is referenced by a roman number (I to VI). The specimens were loaded with a sinusoidal load, oscillating between a relative minimum and a maximum load level. The minimum load level is 5% of the average compressive strength of the respective comcrete batch and the maximum load level either 65% or 75%, which can be found in the file name. Some specimens were subjected to a two stage loading, which is indicated by '7565' for high-low loading or '6575' for low-high loading respectively. The specimens were loaded until failure. If a maximum number of cycles of 2 million was reached, they were stopped as well and counted as run-outs. Following channels are used in each file: Zeit (Standardmessrate) [time (standard measuring rate)] in s, Zeit (langsame Messrate) [time (slow measuring rate)] in s, Kraft [force] in kN, Maschinenweg [machine displacement] in mm, Laser bei Umfang [displacement measured by laser sensor at circumference] 0° in mm, Laser bei Umfang [displacement measured by laser sensor at circumference] 120° in mm, Laser bei Umfang [displacement measured by laser sensor at circumference] 240° in mm, Lufttemperatur [air temperature, related to the slow measuring rate] in °C, Temperatur Mitte [temperature at middle height of the specimen] in °C, Lastwechsel [number of cycles], Laser gemittelt [average of the three laser sensors] in mm 2023-01-01T00:00:00Z https://opara.zih.tu-dresden.de/xmlui/handle/123456789/6027 Raw data of the creep tests on cylindrical specimens Birkner, Dennis; Marx, Steffen This dataset contains the raw data of the creep tests on the concrete cylinder specimens. Four batches (batch 1 and 2 of concrete C80 and batch 3 and 4 on concrete C30) were tested. Three specimens were placed on top of each other in each test and loaded with the same load. The specimens are referenced with letters O (top), M (middle) and U (bottom). Following measuring channels are used in each file: - Zeit (time) in s - Umgebungstemperatur (ambient temperature) in °C - Luftfeuchtigkeit (relative humidity) in % - Kraft (force) in kN - Verformung bei Umfang (displacement at circumference) 0° in mm - Verformung bei Umfang (displacement at circumference) 120° in mm - Verformung bei Umfang (displacement at circumference) 240° in mm - Mittelweg der drei Verformungen (average value of the three displacements) in mm 2023-01-01T00:00:00Z https://opara.zih.tu-dresden.de/xmlui/handle/123456789/6000 Raw data of the cylinder tests for determining compressive strength and modulus of elasticity Birkner, Dennis This dataset contains the raw data of the tests on concrete cylinders to determine the compressive strength and the modulus of elasticity of the different batches. Two concrete mixes were investigated (C30 and C80). The batch is referenced by a roman number (I to VI). Three cylinder specimens were tested from each batch. The first was loaded with continously increasing force until failure. The ultimate load was used to determine the load levels of the tests for the modulus of elasticity according to DIN EN 12390-13, method B, for the tests on the other two specimens. After carrying out these two tests, both specimens were also loaded with increasing force until failure. Following channels are used in each file: Zeit (Standardmessrate) [time (standard measuring rate)] in s, Zeit (langsame Messrate) [time (slow measuring rate)] in s, Kraft [force] in kN, Maschinenweg [machine displacement] in mm, Laser bei Umfang [displacement measured by laser sensor at circumference] 0° in mm, Laser bei Umfang [displacement measured by laser sensor at circumference] 120° in mm, Laser bei Umfang [displacement measured by laser sensor at circumference] 240° in mm, Lufttemperatur [relative humidity, related to the slow measuring rate] in °C, DD1_1 und DD1_2 (LVDT, placed at middle specimen height at 0° and 180°, measuring length 150 mm) in mm 2023-01-01T00:00:00Z