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Numerical analysis of concealed beam-column timber connections in fire
Thesis (MEng)--Stellenbosch University, 2024.
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| Format: | Thesis |
| Language: | en_ZA en_ZA |
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Stellenbosch : Stellenbosch University
2024
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| _version_ | 1867613749284700160 |
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| access_status_str | Open Access |
| author | Zulu, Siphephelo Phakeme |
| author2 | Walls, Richard Shaun |
| author_browse | Walls, Richard Shaun Zulu, Siphephelo Phakeme |
| author_facet | Walls, Richard Shaun Zulu, Siphephelo Phakeme |
| author_sort | Zulu, Siphephelo Phakeme |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2024. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/130632 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA en_ZA |
| last_indexed | 2026-06-10T12:41:04.390Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/130632 Numerical analysis of concealed beam-column timber connections in fire Zulu, Siphephelo Phakeme Walls, Richard Shaun Fataar, Humaira Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering. Fire resistant materials Finite element method Building materials Timber Self-tapping screws Thesis (MEng)--Stellenbosch University, 2024. ENGLISH ABSTRACT: Fire is an unpredictable event, but if it does occur a structure should be designed in such a way that it would be able to resist such an event while remaining structurally sound. The recent rise in popularity of timber as a structural material of choice opens new questions about how safe timber structures are if there is a fire since timber is a combustible material and will contribute to fire development. Connections are oftentimes the most failure-prone component of a structure and timber structures are no different. Hence, they should be appropriately analysed and require suitable predictive models. Timber is especially vulnerable as its performance is dependent on how well-protected the connection is. Predicting connection behaviour in fire is complex due to factors such as 3D geometry, the presence of gaps, multiple heat transfer modes, deformations under load, variable material properties with temperature, and the presence of metallic connection components. The development of numerical models to predict connection behaviour would be beneficial for enhancing safety without incurring the high level of costs associated with fire tests. However, this requires the development of complex thermo-mechanical models, as was considered in this thesis. This thesis analyses these connections numerically with the use of the finite element software ABAQUS, and in the process adds to the ever-growing body of validated models in this field. The thesis involves the consideration of four case studies, the first being pure heat transfer, the second being a simple thermal-mechanical model, the third a 4-bolt beam-column connection, and the fourth a 6-bolt beam-column connection. A beam-column connection with varying bolt and self-tapping screw configurations was validated against experimental work from literature. Once validated self-tapering screws were analysed to see what stresses occur in these screws. Beams in beam-column connections are susceptible to brittle failure, this is especially accelerated in fire situations. To ensure that this does not occur beam-column connections can be reinforced with self-tapping screws which helps lower the chances of brittle failure such as bolt-line failure. However, there has been little research done on what happens to those screws, and how to predict such behaviour. Hence, this aspect forms a component of the research conducted. AFRIKAANSE OPSOMMING: ’n Brand is ’n onvoorspelbare gebeurtenis, maar as dit plaasvind, moet ’n struktuur so ontwerp word dat dit die brand kan weerstaan terwyl dit struktureel gesond bly. Die onlangse toename in gewildheid van hout as ’n struktuurmateriaal van keuse laat nuwe vrae ontstaan oor hoe veilig houtstrukture is as daar ’n brand is, aangesien hout ’n brandbare materiaal is en sal bydra tot brandontwikkeling. Konneksies is dikwels die komponent van ’n struktuur wat neig tot mislukking en houtstrukture verskil nie. Daarom moet hulle ontleed word en geskikte voorspellingsmodelle word vereis. Hout is veral kwesbaar aangesien die werkverrigting daarvan afhang van hoe goed die konneksie beskerm is. Die voorspelling van konneksiegedrag in brand is kompleks as gevolg van faktore soos 3Dmeetkunde, die teenwoordigheid van gapings, veelvuldige hitte-oordragmodusse, vervormings onder las, veranderlike materiaaleienskappe met temperatuur, en die teenwoordigheid van metaal konneksiekomponente. Die ontwikkeling van numeriese modelle om konneksiegedrag te voorspel sal voordelig wees om veiligheid te verbeter sonder om die ho¨e kostes van brandtoetse aan te gaan. Dit vereis egter die ontwikkeling van komplekse termomeganiese modelle, soos in hierdie tesis oorweeg sal word. Hierdie tesis ontleed hierdie konneksies numeries met die gebruik van die eindige element sagteware ABAQUS, en dra by tot die groeiende liggaam van gevalideerde modelle in hierdie veld. Die tesis behels die oorweging van vier gevallestudies, waarvan die eerste suiwer hitte-oordrag is, die tweede ’n eenvoudige termies-meganiese model is, die derde ’n 4-bout balk-kolom konneksie, en die vierde ’n 6-bout-balk-kolom-konneksie. ’n Balk-kolom konneksie met verskillende bout- en selftappende skroefkonfigurasies is bekragtig teen eksperimentele werk uit literatuur. Sodra dit gevalideer is, is die selftapskroewe ontleed om te sien watter spannings in hierdie skroewe voorkom. Balke in balk-kolom konneksies is vatbaar vir bros mislukking, dit word veral versnel in brandsituasies. Om te verseker dat dit nie gebeur nie, kan balk-kolom konneksies versterk word met selftappende skroewe wat help om die kanse van bros mislukking soos boutlyn mislukking te verlaag. Daar is egter min navorsing gedoen oor wat met daardie skroewe gebeur, en hoe om sulke gedrag te voorspel. Hierdie aspek vorm dus ’n komponent van die navorsing wat gedoen is. Masters 2024-02-12T06:30:37Z 2024-04-27T00:40:45Z 2024-02-12T06:30:37Z 2024-04-27T00:40:45Z 2024-03 Thesis https://scholar.sun.ac.za/handle/10019.1/130632 en_ZA en_ZA Stellenbosch University xvii, 122 pages : illustrations. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Fire resistant materials Finite element method Building materials Timber Self-tapping screws Zulu, Siphephelo Phakeme Numerical analysis of concealed beam-column timber connections in fire |
| title | Numerical analysis of concealed beam-column timber connections in fire |
| title_full | Numerical analysis of concealed beam-column timber connections in fire |
| title_fullStr | Numerical analysis of concealed beam-column timber connections in fire |
| title_full_unstemmed | Numerical analysis of concealed beam-column timber connections in fire |
| title_short | Numerical analysis of concealed beam-column timber connections in fire |
| title_sort | numerical analysis of concealed beam column timber connections in fire |
| topic | Fire resistant materials Finite element method Building materials Timber Self-tapping screws |
| url | https://scholar.sun.ac.za/handle/10019.1/130632 |
| work_keys_str_mv | AT zulusiphephelophakeme numericalanalysisofconcealedbeamcolumntimberconnectionsinfire |