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Title: The performance of steel framed structures with fin-plate connections in fire
Author: Taib, Mariati
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2012
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Abstract:
The behaviour of joint in global frames subjected to fire is greatly affected by combination of forces and moments, originating from restraint to thermal expansion as well as large vertical deflection of structural members. In order to facilitate the design process of achieving robustness in simple beam-to-column connection, a componentbased model has been developed for fin-plate connections in this research. The new model represents the realistic behaviour of such connections under the influence of combined forces, together with the high rotations which can occur at the ends of beams, during building fires. The key aspect of the component method is that it characterises the force-displacement properties of each active component at any temperature, as a nonlinear "spring". The temperature-dependent characteristics of each individual component in each bolt row are defined, including the failure mechanism of the weakest component, based on experimental and analytical findings. Primary failure modes adopted for fin plate connections are bearing/block shear of the plates and bolt shear. A major additional complication is force reversal in components, which may occur simply because of temperature change, without any physical reversal of displacement. The Massing Rule has been adopted to incorporate the effect of permanent deformations at any temperature when force reversal occurs. To account for the bolt slip phases, force transitions between tensile and compressive quadrants take place only when positive contact between a bolt and the edge of its bolt hole is re-established. The results of high-temperature tests on the fin-plate connections have been used to verifY the model for isolated joints at ambient and elevated temperatures. The developed component model for the fin-plate connection has been extended for the application of moment-resisting beam splice connection, also known as the "column-tree" system. The component-based connection model has also been used to study joint behaviour in structural sub-frame analyses. Incorporating it into non-linear finite element software will enable engineers to generate the global structural interactions for steel and composite structures in fire scenarios, up to and including connection failure. The new connection element has been validated with reasonable agreement with the available experimental data, showing its capability of capturing the key features of the overall connection interaction in a realistic manner, based on the underlying mechanics, coupled with evidence from experimental data.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.578020  DOI: Not available
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