Consideration of the Heating of High-Performance Concretes during Cyclic Tests in the Evaluation of Results
Material-efficient, highly load-bearing members made of high-performance compressive concretes are often exposed to cyclical loads because of their slender construction, which can be relevant to the design. When investigating the fatigue behaviour of high-performance concretes in pressure swell test...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-10-01
|
| Series: | Applied Mechanics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2673-3161/2/4/44 |
| _version_ | 1797506830426963968 |
|---|---|
| author | Melchior Deutscher |
| author_facet | Melchior Deutscher |
| author_sort | Melchior Deutscher |
| collection | DOAJ |
| description | Material-efficient, highly load-bearing members made of high-performance compressive concretes are often exposed to cyclical loads because of their slender construction, which can be relevant to the design. When investigating the fatigue behaviour of high-performance concretes in pressure swell tests, however, the specimen temperature rises strongly owing to the elevated loading rate at frequencies higher than 3 Hz. This leads to a negative influence on the achieved number of load cycles compared to tests carried out at slow speeds and calculated values, for example, according to fib Model Code 2010. This phenomenon, which was already observed, must be considered when generating design formulae or Wöhler lines for component design, as the test conditions with high constant load frequencies as well as sample storage in a climate chamber at constant conditions are prerequisites that cannot be expected in real material applications. Therefore, laboratory testing influences must be eliminated in order to avoid underestimating the material. Instead of adjusting the test conditions to prevent or control temperature development, as was the case in previous approaches, this article shows how the temperature effects can be corrected when analysing the results, considering both the applied stress and the maximum temperature reached. For this purpose, a calculation method was developed that was validated on the basis of a large number of fatigue tests. Thus, in the future, the application of one temperature sensor to the test specimen can effectively advance the extraction of values for Wöhler curves, even with high test frequencies. |
| first_indexed | 2024-03-10T04:39:01Z |
| format | Article |
| id | doaj.art-ddbb88d90e9c40d2b9c75690f123df1b |
| institution | Directory Open Access Journal |
| issn | 2673-3161 |
| language | English |
| last_indexed | 2024-03-10T04:39:01Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Mechanics |
| spelling | doaj.art-ddbb88d90e9c40d2b9c75690f123df1b2023-11-23T03:34:44ZengMDPI AGApplied Mechanics2673-31612021-10-012476678010.3390/applmech2040044Consideration of the Heating of High-Performance Concretes during Cyclic Tests in the Evaluation of ResultsMelchior Deutscher0Institute of Concrete Structures, Technische Universität Dresden, 01069 Dresden, GermanyMaterial-efficient, highly load-bearing members made of high-performance compressive concretes are often exposed to cyclical loads because of their slender construction, which can be relevant to the design. When investigating the fatigue behaviour of high-performance concretes in pressure swell tests, however, the specimen temperature rises strongly owing to the elevated loading rate at frequencies higher than 3 Hz. This leads to a negative influence on the achieved number of load cycles compared to tests carried out at slow speeds and calculated values, for example, according to fib Model Code 2010. This phenomenon, which was already observed, must be considered when generating design formulae or Wöhler lines for component design, as the test conditions with high constant load frequencies as well as sample storage in a climate chamber at constant conditions are prerequisites that cannot be expected in real material applications. Therefore, laboratory testing influences must be eliminated in order to avoid underestimating the material. Instead of adjusting the test conditions to prevent or control temperature development, as was the case in previous approaches, this article shows how the temperature effects can be corrected when analysing the results, considering both the applied stress and the maximum temperature reached. For this purpose, a calculation method was developed that was validated on the basis of a large number of fatigue tests. Thus, in the future, the application of one temperature sensor to the test specimen can effectively advance the extraction of values for Wöhler curves, even with high test frequencies.https://www.mdpi.com/2673-3161/2/4/44UHPCfatigue behaviourtemperature increaseWöhler curve |
| spellingShingle | Melchior Deutscher Consideration of the Heating of High-Performance Concretes during Cyclic Tests in the Evaluation of Results Applied Mechanics UHPC fatigue behaviour temperature increase Wöhler curve |
| title | Consideration of the Heating of High-Performance Concretes during Cyclic Tests in the Evaluation of Results |
| title_full | Consideration of the Heating of High-Performance Concretes during Cyclic Tests in the Evaluation of Results |
| title_fullStr | Consideration of the Heating of High-Performance Concretes during Cyclic Tests in the Evaluation of Results |
| title_full_unstemmed | Consideration of the Heating of High-Performance Concretes during Cyclic Tests in the Evaluation of Results |
| title_short | Consideration of the Heating of High-Performance Concretes during Cyclic Tests in the Evaluation of Results |
| title_sort | consideration of the heating of high performance concretes during cyclic tests in the evaluation of results |
| topic | UHPC fatigue behaviour temperature increase Wöhler curve |
| url | https://www.mdpi.com/2673-3161/2/4/44 |
| work_keys_str_mv | AT melchiordeutscher considerationoftheheatingofhighperformanceconcretesduringcyclictestsintheevaluationofresults |