A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Fatigue behaviour of ultra high performance concrete (UHPC) under alternating tensile and compressive loading
Within this article, the research on the fatigue behaviour of UHPC (Ultra High Performance Concrete) under cyclic loading is shown. Due to economic design alternating live load may cause cyclic stress reversal loading. Representing this kind of loading, 120 single-level fatigue tests were performed on UHPC specimens without reinforcement. As expected the number of load cycles found in the tests on UHPC exceeds the results of tests on NSC (normal strength concrete) by far. Remarkable is also the large scatter of the number of load cycles. Local faults which initiate and accelerate the failure progress can be assumed to be a reason for these large scatter. Due to the addition of fibres the damage progress may be slowed down and exhibit a less brittle behaviour. Considering these test results economic design of UHPC structures under cyclic loading is possible. For the next research phase additional tests with more than 10 million load cycles are planned. Furthermore, the damage behaviour of UHPC under cyclic loading will be investigated by deformation measurement. Other stress ranges will also be investigated to get the correlation between the specimens with and without failure. Additional tests on specimens with air voids will also be investigated (LP). The experimental tests includes in the main series (HV) 45 tests and the one additional test series (LP) consists of 20 tests.
Fatigue behaviour of ultra high performance concrete (UHPC) under alternating tensile and compressive loading
Within this article, the research on the fatigue behaviour of UHPC (Ultra High Performance Concrete) under cyclic loading is shown. Due to economic design alternating live load may cause cyclic stress reversal loading. Representing this kind of loading, 120 single-level fatigue tests were performed on UHPC specimens without reinforcement. As expected the number of load cycles found in the tests on UHPC exceeds the results of tests on NSC (normal strength concrete) by far. Remarkable is also the large scatter of the number of load cycles. Local faults which initiate and accelerate the failure progress can be assumed to be a reason for these large scatter. Due to the addition of fibres the damage progress may be slowed down and exhibit a less brittle behaviour. Considering these test results economic design of UHPC structures under cyclic loading is possible. For the next research phase additional tests with more than 10 million load cycles are planned. Furthermore, the damage behaviour of UHPC under cyclic loading will be investigated by deformation measurement. Other stress ranges will also be investigated to get the correlation between the specimens with and without failure. Additional tests on specimens with air voids will also be investigated (LP). The experimental tests includes in the main series (HV) 45 tests and the one additional test series (LP) consists of 20 tests.
Fatigue behaviour of ultra high performance concrete (UHPC) under alternating tensile and compressive loading
Ermüdungsverhalten von Ultrahochleistungsbeton (UHPC) unter alternierender Zug- und Druckbelastung
Fitik, Birol (author) / Niedermeier, Roland (author) / Zilch, Konrad (author)
2008
6 Seiten, 12 Bilder, 2 Tabellen, 6 Quellen
Conference paper
English
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