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The elastic rigidities of ribbed plates
This thesis deals with the flexural and twisting rigidities of orthotropic plates. Asymmetrically stiffened plates are examples of technically orthotropic plates and are found in civil engineering structures such as bridges and ribbed floor slabs. The formulae for the rigidities as found in the lite...
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| Format: | Thesis |
| Language: | English |
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Department of Civil Engineering
2016
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| _version_ | 1867613335398121473 |
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| access_status_str | Open Access |
| author | Little, Robert Dryden |
| author2 | Doyle, WS |
| author_browse | Doyle, WS Little, Robert Dryden |
| author_facet | Doyle, WS Little, Robert Dryden |
| author_sort | Little, Robert Dryden |
| collection | Thesis |
| description | This thesis deals with the flexural and twisting rigidities of orthotropic plates. Asymmetrically stiffened plates are examples of technically orthotropic plates and are found in civil engineering structures such as bridges and ribbed floor slabs. The formulae for the rigidities as found in the literature are reviewed. The writer has devised an experimental method of determining the rigidities. This involves a bending test using the Moire technique and a twisting test. In the writer's method only one model is needed to determine all the rigidities. This is compared to other methods for which two or three models are needed. Sixteen different models of asymmetrically stiffened plates with ribs running in one direction only were made. The flexural rigidities of eight of these models and the twisting rigidities of all sixteen models were determined. The objective of the tests was to compare the test values with the theoretical values. More specifically the objective can be defined as follows. a) To determine how well an asymmetrically stiffened plate behaves as an orthotropic plate, i.e. how far apart may the ribs be spaced before the plate becomes a system of plate elements and beam elements. b) To determine the influence, if any, on the rigidities Dx, D₁ and Dy of altering the spacing of the ribs of stiffened plates which have the same theoretical values of Dx. c) To determine whether there is any difference between the rigidities D₁₂ and D₂₁, which are the same for a true orthotropic plate and are usually assumed to be the same for an asymmetrically stiffened plate. Conclusions are drawn on these points. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/17674 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:28.941Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| 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:11427/17674 The elastic rigidities of ribbed plates Little, Robert Dryden Doyle, WS Civil Engineering This thesis deals with the flexural and twisting rigidities of orthotropic plates. Asymmetrically stiffened plates are examples of technically orthotropic plates and are found in civil engineering structures such as bridges and ribbed floor slabs. The formulae for the rigidities as found in the literature are reviewed. The writer has devised an experimental method of determining the rigidities. This involves a bending test using the Moire technique and a twisting test. In the writer's method only one model is needed to determine all the rigidities. This is compared to other methods for which two or three models are needed. Sixteen different models of asymmetrically stiffened plates with ribs running in one direction only were made. The flexural rigidities of eight of these models and the twisting rigidities of all sixteen models were determined. The objective of the tests was to compare the test values with the theoretical values. More specifically the objective can be defined as follows. a) To determine how well an asymmetrically stiffened plate behaves as an orthotropic plate, i.e. how far apart may the ribs be spaced before the plate becomes a system of plate elements and beam elements. b) To determine the influence, if any, on the rigidities Dx, D₁ and Dy of altering the spacing of the ribs of stiffened plates which have the same theoretical values of Dx. c) To determine whether there is any difference between the rigidities D₁₂ and D₂₁, which are the same for a true orthotropic plate and are usually assumed to be the same for an asymmetrically stiffened plate. Conclusions are drawn on these points. 2016-03-14T07:03:02Z 2016-03-14T07:03:02Z 1972 Master Thesis Masters MSc http://hdl.handle.net/11427/17674 eng application/pdf Department of Civil Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Civil Engineering Little, Robert Dryden The elastic rigidities of ribbed plates |
| thesis_degree_str | Master's |
| title | The elastic rigidities of ribbed plates |
| title_full | The elastic rigidities of ribbed plates |
| title_fullStr | The elastic rigidities of ribbed plates |
| title_full_unstemmed | The elastic rigidities of ribbed plates |
| title_short | The elastic rigidities of ribbed plates |
| title_sort | elastic rigidities of ribbed plates |
| topic | Civil Engineering |
| url | http://hdl.handle.net/11427/17674 |
| work_keys_str_mv | AT littlerobertdryden theelasticrigiditiesofribbedplates AT littlerobertdryden elasticrigiditiesofribbedplates |