{"id":{"repo_id":"cape-town","oai_identifier":"oai:open.uct.ac.za:11427/17674"},"canonical_url":"https://search.dev.ndltd.org/etd/cape-town/oai:open.uct.ac.za:11427/17674","repository":{"repo_id":"cape-town","name":"University of Cape Town","base_url":"https://open.uct.ac.za/oai/request"},"display":{"title":"The elastic rigidities of ribbed plates","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Little, Robert Dryden"],"institution":"Department of Civil Engineering","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Doyle, WS"],"committee_chairs":[],"committee_members":[],"year":1972,"date_issued":"1972","date_published":"1972","updated_at":"2026-07-22T22:23:27Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11427/17674","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Doyle, WS"]},{"key":"dc:creator","label":"Author","values":["Little, Robert Dryden"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-03-14T07:03:02Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2016-03-14T07:03:02Z"]},{"key":"dc:date.issued","label":"Date","values":["1972"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Department of Civil Engineering"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Cape Town"]},{"key":"dc:type","label":"Dc Type","values":["Master Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Masters"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["MSc"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11427/17674"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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."]},{"key":"dc:title","label":"Title","values":["The elastic rigidities of ribbed plates"]}]}],"canonical_facts":{"dc:contributor.advisor":["Doyle, WS"],"dc:creator":["Little, Robert Dryden"],"dc:date.accessioned":["2016-03-14T07:03:02Z"],"dc:date.available":["2016-03-14T07:03:02Z"],"dc:date.issued":["1972"],"dc:description.abstract":["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."],"dc:identifier.uri":["http://hdl.handle.net/11427/17674"],"dc:language.iso":["eng"],"dc:publisher.department":["Department of Civil Engineering"],"dc:publisher.institution":["University of Cape Town"],"dc:title":["The elastic rigidities of ribbed plates"],"dc:type":["Master Thesis"],"dc:type.qualificationlevel":["Masters"],"dc:type.qualificationname":["MSc"]},"updated_at":"2026-07-22T22:23:27Z"}