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Failure mode dependence of target reliability in concrete and steel structures in ultimate and serviceability limit states
Thesis (MEng)--Stellenbosch University, 2023.
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| Format: | Thesis |
| Language: | en_ZA en_ZA |
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Stellenbosch : Stellenbosch University
2023
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| _version_ | 1867613885444390912 |
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| access_status_str | Open Access |
| author | Mwanangombe, Judah |
| author2 | De Koker, Nico |
| author_browse | De Koker, Nico Mwanangombe, Judah |
| author_facet | De Koker, Nico Mwanangombe, Judah |
| author_sort | Mwanangombe, Judah |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2023. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/126988 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA en_ZA |
| last_indexed | 2026-06-10T12:43:14.822Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/126988 Failure mode dependence of target reliability in concrete and steel structures in ultimate and serviceability limit states Mwanangombe, Judah De Koker, Nico Way, Andrew Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering. Reliability (Engineering) Structural design Concrete beams Flexure Thesis (MEng)--Stellenbosch University, 2023. ENGLISH ABSTRACT: Optimal cost of structures is a very expansive topic in structural design. Among the many key factors that affect its outcome is the decision parameter of a limit state in focus. There is an intrinsic effect on the target reliability as the decision parameter is changed. Rather than designing for every limit state using a case-specific formulation of reliability design, structures are often designed using a generic approach simulated in the partial factor methods of design. Van Nierop (2018), inferred that there is a discrepancy in the target reliability obtained using a generic formulation as compared to when a case-specific limit state is used for SLS limit states. This research is motivated by the desire to investigate the efficiency of the decision parameter in ULS and SLS limit states in predicting the target reliability of concrete and steel structural members. Notions of structural reliability design are employed. Specific limit states in structural concrete and steel members specifically: flexure, shear, tension, lateral torsion buckling, compression, deflection and crack width were considered individually.Risk-optimal target reliability of each specific limit state was compared to that yielded by a generic approach, and the degree of loss in optimality assessed. It is shown that the form of the decision parameter is responsible for how efficient it is in predicting target reliability. SLS limit states in concrete and steel indicate case-specific decision parameters more efficient than obtained using the generic formulation. For ULS, flexure in concrete, shear in concrete, tension of steel members, compression of steel short columns all yield case-specific decision parameters that are as efficient as those of the generic simulation of each case-specific limit state. However, for ULS, flexure of steel section members, lateral torsional buckling of steel section members and shear of steel section members have significant discrepancy in the target reliability obtained from cost optimisation using case-specific formulation and generic formulation. It is inferred that the case-specific decision parameter is more efficient than the generic decision parameter. AFRIKAANS OPSOMMING: Die optimale koste van strukture is ’n baie uitgebreide onderwerp in strukturele ontwerp. Onder die baie sleutelfaktore wat die uitkoms daarvan be¨ınvloed, is die besluitparameter van ’n limiettoestand in fokus. Daar is ’n intrinsieke effek op die teikenbetroubaarheid namate die besluitparameter verander word. Eerder as om vir elke limiettoestand te ontwerp deur ’n gevalspesifieke formulering van betroubaarheidsontwerp te gebruik, word strukture dikwels ontwerp deur gebruik te maak van ’n generiese benadering wat in die gedeeltelike faktormetodes van ontwerp gesimuleer word. Van Nierop (2018), afgelei dat daar ’n verskil is in die teikenbetroubaarheid wat verkry word met ’n generiese formulering in vergelyking met wanneer ’n gevalspesifieke limiettoestand vir SLS-limiettoestande gebruik word. Hierdie navorsing word gemotiveer deur die begeerte om die doeltreffendheid van die besluitparameter in ULS- en SLS-limiettoestande te ondersoek in die voorspelling van die teikenbetroubaarheid van beton- en staalstruktuurlede. Begrippe van strukturele betroubaarheidsontwerp word gebruik. Spesifieke limiettoestande in strukturele beton- en staalelemente spesifiek: buiging, skuif, spanning, laterale torsie-knik, kompressie, defleksie en kraakwydte is individueel oorweeg. Risiko-optimale teikenbetroubaarheid van elke spesifieke limiettoestand is vergelyk met di´e wat deur ’n generiese benadering opgelewer word. , en die mate van verlies in optimaliteit geassesseer. Daar word aangetoon dat die vorm van die besluitparameter verantwoordelik is vir hoe doeltreffend dit is om teikenbetroubaarheid te voorspel. SLS limiettoestande in beton en staal dui op gevalspesifieke besluitnemingsparameters meer doeltreffend as wat verkry word deur die generiese formulering te gebruik. Vir ULS lewer buiging in beton, skuifwerk in beton, spanning van staallede, saampersing van staalkortkolomme alles gevalspesifieke besluitnemingsparameters op wat so doeltreffend is soos di´e van die generiese simulasie van elke gevalspesifieke limiettoestand. Vir ULS het buiging van staalseksielede, laterale torsiebuiging van staalgedeeltelede en skuif van staalgedeeltelede egter ’n beduidende verskil in die teikenbetroubaarheid wat verkry word deur kosteoptimalisering deur gebruik te maak van gevalspesifieke formulering en generiese formulering. Daar word afgelei dat die geval-spesifieke besluit parameter meer doeltreffend is as die generiese besluit parameter. Masters 2023-02-20T12:26:13Z 2023-05-18T06:58:57Z 2023-02-20T12:26:13Z 2023-05-18T06:58:57Z 2023-02 Thesis http://hdl.handle.net/10019.1/126988 en_ZA en_ZA Stellenbosch University xv, 145 pages : illustrations. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Reliability (Engineering) Structural design Concrete beams Flexure Mwanangombe, Judah Failure mode dependence of target reliability in concrete and steel structures in ultimate and serviceability limit states |
| title | Failure mode dependence of target reliability in concrete and steel structures in ultimate and serviceability limit states |
| title_full | Failure mode dependence of target reliability in concrete and steel structures in ultimate and serviceability limit states |
| title_fullStr | Failure mode dependence of target reliability in concrete and steel structures in ultimate and serviceability limit states |
| title_full_unstemmed | Failure mode dependence of target reliability in concrete and steel structures in ultimate and serviceability limit states |
| title_short | Failure mode dependence of target reliability in concrete and steel structures in ultimate and serviceability limit states |
| title_sort | failure mode dependence of target reliability in concrete and steel structures in ultimate and serviceability limit states |
| topic | Reliability (Engineering) Structural design Concrete beams Flexure |
| url | http://hdl.handle.net/10019.1/126988 |
| work_keys_str_mv | AT mwanangombejudah failuremodedependenceoftargetreliabilityinconcreteandsteelstructuresinultimateandserviceabilitylimitstates |