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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.

Characterization of Strength-Shift Behavior of Bolts Connected with and without Preloading