Measured temperature effects during the construction of a prestressed precast concrete bridge beam
Prestress losses in precast concrete beams include the short-term effects of elastic shortening and the long-term effects of concrete shrinkage, concrete creep and steel relaxation. Temperature effects are, however, excluded. The aim of this research was to monitor the behaviour of a prestressed pre...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2018-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | https://doi.org/10.1051/matecconf/201819911013 |
| _version_ | 1818614662680281088 |
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| author | Küsel Frank Kearsley Elsabe Butler Liam J. Skorpen Sarah A. Elshafie M.Z.E.B. |
| author_facet | Küsel Frank Kearsley Elsabe Butler Liam J. Skorpen Sarah A. Elshafie M.Z.E.B. |
| author_sort | Küsel Frank |
| collection | DOAJ |
| description | Prestress losses in precast concrete beams include the short-term effects of elastic shortening and the long-term effects of concrete shrinkage, concrete creep and steel relaxation. Temperature effects are, however, excluded. The aim of this research was to monitor the behaviour of a prestressed precast concrete bridge beam, focussing on temperature effects and destressing. Successful monitoring assists in comparing the real performance of a structure to the expected design performance, and in managing the durability of the monitored structure. The effect of temperature variation on strains in prestressed beams was investigated by instrumenting a precast beam. Temperature and strains were monitored from the day of casting up to and including the cutting of the pretensioning strands. Daily temperature variations causing vertical non-linear temperature profiles resulted in internal strains of up to 28 % of the strains caused by destressing. It was therefore concluded that thermal effects before destressing resulting from elevated curing temperatures and daily temperature changes should be considered in the calculation of prestress losses. The monitoring techniques used were successful in determining the stresses and strains within the beam, which can be used to compare real prestress losses with the losses assumed in design. |
| first_indexed | 2024-12-16T16:21:35Z |
| format | Article |
| id | doaj.art-a2fb48cea3b04093a4b09e1dd0c9a6ec |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-12-16T16:21:35Z |
| publishDate | 2018-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-a2fb48cea3b04093a4b09e1dd0c9a6ec2022-12-21T22:24:53ZengEDP SciencesMATEC Web of Conferences2261-236X2018-01-011991101310.1051/matecconf/201819911013matecconf_iccrrr2018_11013Measured temperature effects during the construction of a prestressed precast concrete bridge beamKüsel Frank0Kearsley Elsabe1Butler Liam J.2Skorpen Sarah A.3Elshafie M.Z.E.B.4Department of Civil Engineering, University of PretoriaDepartment of Civil Engineering, University of PretoriaDepartment of Engineering, University of CambridgeDepartment of Civil Engineering, University of PretoriaDepartment of Engineering, University of CambridgePrestress losses in precast concrete beams include the short-term effects of elastic shortening and the long-term effects of concrete shrinkage, concrete creep and steel relaxation. Temperature effects are, however, excluded. The aim of this research was to monitor the behaviour of a prestressed precast concrete bridge beam, focussing on temperature effects and destressing. Successful monitoring assists in comparing the real performance of a structure to the expected design performance, and in managing the durability of the monitored structure. The effect of temperature variation on strains in prestressed beams was investigated by instrumenting a precast beam. Temperature and strains were monitored from the day of casting up to and including the cutting of the pretensioning strands. Daily temperature variations causing vertical non-linear temperature profiles resulted in internal strains of up to 28 % of the strains caused by destressing. It was therefore concluded that thermal effects before destressing resulting from elevated curing temperatures and daily temperature changes should be considered in the calculation of prestress losses. The monitoring techniques used were successful in determining the stresses and strains within the beam, which can be used to compare real prestress losses with the losses assumed in design.https://doi.org/10.1051/matecconf/201819911013 |
| spellingShingle | Küsel Frank Kearsley Elsabe Butler Liam J. Skorpen Sarah A. Elshafie M.Z.E.B. Measured temperature effects during the construction of a prestressed precast concrete bridge beam MATEC Web of Conferences |
| title | Measured temperature effects during the construction of a prestressed precast concrete bridge beam |
| title_full | Measured temperature effects during the construction of a prestressed precast concrete bridge beam |
| title_fullStr | Measured temperature effects during the construction of a prestressed precast concrete bridge beam |
| title_full_unstemmed | Measured temperature effects during the construction of a prestressed precast concrete bridge beam |
| title_short | Measured temperature effects during the construction of a prestressed precast concrete bridge beam |
| title_sort | measured temperature effects during the construction of a prestressed precast concrete bridge beam |
| url | https://doi.org/10.1051/matecconf/201819911013 |
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