Analysis of Bolted Joints in Steel Structures
Translated title
Analyse af Boltsamlinger i Stålkonstruktioner
Author
Arulanantham, Hariesh
Term
4. term
Education
Publication year
2024
Submitted on
2024-03-01
Pages
101
Abstract
This thesis investigates the nonlinear behavior and moment capacity of bolted end‑plate connections and their influence on the global response of a fixed‑base portal frame. Several connection configurations, varying bolt location and end‑plate geometry, are defined, and their moment‑rotation curves are established using two approaches: the analytical Component Method in accordance with Eurocode 3 and a numerical finite element model in ANSYS. The resulting joint curves are then introduced into frame analyses conducted with the analytical slope‑deflection method and a numerical RFEM model to examine the bending moment distribution; results from the two approaches are compared. The study identifies differences between methods: for thin end‑plates with bolts close to the plate edge, the numerical model predicts a lower bending moment resistance than the analytical method, whereas for configurations with more centrally located bolts, the numerical model predicts a higher resistance. Frame moment distributions from both analysis routes are broadly consistent, and observed discrepancies are attributed to the linear‑elastic assumption in the slope‑deflection formulation versus the nonlinear material modeling used in the numerical analyses.
Dette speciale undersøger den ikke‑lineære adfærd og momentbæreevne af boltede tværpladesamlinger samt deres indflydelse på den globale respons af en portalramme med indspændte understøtninger. Flere samlingskonfigurationer med variationer i boltplacering og endpladens geometri opstilles, og deres moment‑rotationskurver bestemmes ved to tilgange: den analytiske Komponentmetode i henhold til Eurocode 3 og en numerisk finite element‑model i ANSYS. De opnåede arbejdskurver anvendes derefter i ramanalyser udført med den analytiske Slope‑Deflection metode og en numerisk model i RFEM for at belyse rammens momentfordeling; resultaterne fra de to tilgange sammenlignes. Undersøgelsen viser forskelle mellem metoderne: for tynde endplader med bolte tæt på pladekanten forudsiger den numeriske model en lavere momentbæreevne end den analytiske metode, mens den numeriske model giver større bæreevne for konfigurationer med mere centralt placerede bolte. Rammens momentfordelinger fra de to analyseveje korrelerer overordnet, og observerede afvigelser tilskrives, at Slope‑Deflection metoden er lineært elastisk, mens de numeriske analyser benytter en ikke‑lineær materialemodel.
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