Graduate School of Natural and Applied Sciences
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Browsing Graduate School of Natural and Applied Sciences by Subject "Civil Engineering"
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thesis.listelement.badge BEHAVIOR OF PIN CONNECTIONS UNDER AXIAL LOAD(2023-01-27) YAHYA, Mustafa Ahmed; SÖNMEZ, ErtanPin connections are commonly used in engineering structures due to their simplic ity and ease of construction. Although their structural behavior and design is rel atively simple, the stress distribution due to the mechanics of two contact surfaces is actually quite complex. In design codes, the geometry of the pin connections is typically restricted by some empirical equations without any detailed information on their development. In this thesis, the behavior of pin connections under axial load is investigated by analyzing parametric finite element models and studying the effects of pin-to-hole diameter ratio, eccentricity of the hole (in axial direction), and bend ing of the pin. The contact interaction between the pin and the plate is modeled by face-to-face penalty contact formulation. The contact between the pin and the plate is assumed to be frictionless. The accuracy of models is checked via mesh sensitiv ity analyses and comparison to analytical solutions given by Hertz for non-conformal cylindrical contacts and by Persson for conformal cylindrical contact. Based on the results of analyses performed in this study, it is found that all three parameters (i.e., pin-to-hole diameter ratio, eccentricity of the hole and bending of the pin) can have significant effects on stress concentration in pin connections. Although two-dimensional models are useful in preliminary assessment and model verification, they ignore through-thickness effects that may be significant in some cases; therefore, three-dimensional models provide more accurate representation of stress distribution in the pin connections. The analyses also confirm that the analytical solutions of both Hertz and Persson gave reasonable results for smaller contact angles when pin bending effect is not present while Hertz’s solution deviates significantly from the results of finite element models with neat-fit pin having a more conformal contact surface with larger contact angles (i.e., total contact angles higher than 40◦ ).