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Validation of the deck behaviour due to post-tension loading of Ashton arch bridge
The new Ashton Bridge is a concrete tied-arch structure with a cable-supported deck, which spans 110 metres below the arching ribs. The tie-beam members, connecting the arch ribs, each have six longitudinal tendons that have primarily straight profiles. The author set out to validate the structural...
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| Format: | Thesis |
| Language: | English |
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Department of Civil Engineering
2020
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| _version_ | 1867613204829437952 |
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| access_status_str | Open Access |
| author | Van Wijk, Heinrich |
| author2 | Moyo, Pilate |
| author_browse | Moyo, Pilate Van Wijk, Heinrich |
| author_facet | Moyo, Pilate Van Wijk, Heinrich |
| author_sort | Van Wijk, Heinrich |
| collection | Thesis |
| description | The new Ashton Bridge is a concrete tied-arch structure with a cable-supported deck, which spans 110 metres below the arching ribs. The tie-beam members, connecting the arch ribs, each have six longitudinal tendons that have primarily straight profiles. The author set out to validate the structural behaviour of the tie-beams, after the post-tensioning construction stage. This objective was achieved by validating selected finite element model parameters with field conducted tests. The input parameter, which is the prestress loading onto the structure, was validated with tendon elongation measurements and tendon lift-off tests. The output parameter, which is the strain and displacement response of the structure, was verified by measuring the elastic deck shortening and the strain gauge readings. Lower tendon extensions were encountered during tensioning. This required calibration of the friction coefficients and model updating. Lift-off tests and deck shortening measurements provided and order size estimation of the structural behaviour, but was not adequate for model validation. The strain gauge readings showed a close correlation with the expected strain state of the structure and offered insight into the behaviour of the structure during post-tensioning. The methods described in this dissertation may be used for validating the structural behaviour of concrete bridges subject to post-tensioning. Suggestions for improving tendon lift-off tests and deck shortening measurements are also presented. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/31783 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:26.116Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | Department of Civil Engineering |
| publisherStr | Department of Civil Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/31783 Validation of the deck behaviour due to post-tension loading of Ashton arch bridge Van Wijk, Heinrich Moyo, Pilate prestress concrete bridge monitoring tension-member The new Ashton Bridge is a concrete tied-arch structure with a cable-supported deck, which spans 110 metres below the arching ribs. The tie-beam members, connecting the arch ribs, each have six longitudinal tendons that have primarily straight profiles. The author set out to validate the structural behaviour of the tie-beams, after the post-tensioning construction stage. This objective was achieved by validating selected finite element model parameters with field conducted tests. The input parameter, which is the prestress loading onto the structure, was validated with tendon elongation measurements and tendon lift-off tests. The output parameter, which is the strain and displacement response of the structure, was verified by measuring the elastic deck shortening and the strain gauge readings. Lower tendon extensions were encountered during tensioning. This required calibration of the friction coefficients and model updating. Lift-off tests and deck shortening measurements provided and order size estimation of the structural behaviour, but was not adequate for model validation. The strain gauge readings showed a close correlation with the expected strain state of the structure and offered insight into the behaviour of the structure during post-tensioning. The methods described in this dissertation may be used for validating the structural behaviour of concrete bridges subject to post-tensioning. Suggestions for improving tendon lift-off tests and deck shortening measurements are also presented. 2020-05-06T02:32:48Z 2020-05-06T02:32:48Z 2019 2020-05-06T01:48:10Z Master Thesis Masters MSc (Eng) https://hdl.handle.net/11427/31783 eng application/pdf Department of Civil Engineering Faculty of Engineering and the Built Environment |
| spellingShingle | prestress concrete bridge monitoring tension-member Van Wijk, Heinrich Validation of the deck behaviour due to post-tension loading of Ashton arch bridge |
| thesis_degree_str | Master's |
| title | Validation of the deck behaviour due to post-tension loading of Ashton arch bridge |
| title_full | Validation of the deck behaviour due to post-tension loading of Ashton arch bridge |
| title_fullStr | Validation of the deck behaviour due to post-tension loading of Ashton arch bridge |
| title_full_unstemmed | Validation of the deck behaviour due to post-tension loading of Ashton arch bridge |
| title_short | Validation of the deck behaviour due to post-tension loading of Ashton arch bridge |
| title_sort | validation of the deck behaviour due to post tension loading of ashton arch bridge |
| topic | prestress concrete bridge monitoring tension-member |
| url | https://hdl.handle.net/11427/31783 |
| work_keys_str_mv | AT vanwijkheinrich validationofthedeckbehaviourduetoposttensionloadingofashtonarchbridge |