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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Characterization of Strength-Shift Behavior of Bolts Connected with and without Preloading
Author(s)
A. Trindade
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DOI:10.17265/2159-5275/2018.01.002
Affiliation(s)
Departamento de Engenharia Mecânica e Gestão Industrial, Instituto Politécnico de Viseu, Portugal
ABSTRACT
Bolted joins allow for more efficient joining of parts (mechanical and
structural components) when assembly and disassembly, called
interchangeability, are concerned. Also and for this reason, they are the most
widely used in the final assembly, already in construction, in a state of final
consolidation of the structure. This work began in a
pedagogical action to compare the experimental results with those obtained by
Eurocode 3 (EN 1993-1-8) in simple joints with screws subject to cutting, the
study evolved the analysis of the behavior of the screws themselves in the
joint .Tests were carried out with great dimensional accuracy, for new bolted
connections, with different bolt’s number, according to different arrangements
and repeated in cases of simple and preloaded tightening. The experimental
work, carried out on a uniaxial tensile testing machine, consisted in
subjecting the connections to a growing effort so that the bolts, being subject
to the cut, would break through the thread-free zone. The analysis of results and their comparison (in force—displacement diagrams) allow drawing conclusions
regarding the true behavior of the bolted connections. The characterization of
the thresholds of the initial zone of the force—displacement curves, in the cases of connections with preloading—was the objective of
study. The transfer of forces and the influence of friction on the bonds
without and with preloading were then characterized. The main objective of this
project is to know the meaning of the calculated values in the preloaded and
non-preloaded links by Eurocode 3.
KEYWORDS
Bolts, connections, collapsible, preloading, Eurocode 3.
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