Stefan Harenberg, Matthias Pahn, Viktória Malárics-Pfaff, Frank Dehn, Antonio Caggiano, Diego S. Schicchi, Sha Yang, Eddies Koenders

• This paper provides experimental results on investigations for the validation of photo-grammetric strain measurements of ultra-high-performance concrete (UHPC)-prismssubjected to static and cyclic bending-tensile stress. For this purpose, 4 static and5 cyclic test series were performed. Damage progresses during loading are monitoredby means of a digital image correlation (DIC) system and a clip gauge. The control ofthe DIC by trigger lists and the measurement noise as a function of the measurementrate are examined. All static tests were performed force controlled with the same test-ingspeedandthesamemeasuringrateofDICandclipgauge.Allcyclictestswereperformed with the same upper and lower stress levels but with different loading rates.During the static tests, the DIC can be used to make accurate strain measurementsbefore UHPC failure. In the cyclic tests, the measurement noise of the DICdecreases with an increasing measuring rate. The tests performed confirm the con-trol of the DIC by trigger lists for cyclic tests on UHPC-prisms and show that themeasurement noise is negligible in static and cyclic tests.