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See detailA low-order analytical model to monitor tension in shallow cables with specific end conditions
Geuzaine, Margaux ULiege; Denoël, Vincent ULiege

Poster (2019, March 15)

In order to remotely monitor tension in a cable over time, an appropriate method is based on the natural frequencies of the cable measured by means of wireless accelerometers. In this paper, an existing ... [more ▼]

In order to remotely monitor tension in a cable over time, an appropriate method is based on the natural frequencies of the cable measured by means of wireless accelerometers. In this paper, an existing method is extended to determine the tension in long or short shallow cables with small bending stiffness and arbitrary end conditions. First, a low-order analytical model is developed to compute the dynamic response of a given cable. Then, the unknown parameters such as the end conditions, the exact length of the cable and the tension in the cable are adjusted, using an iterative nonlinear least-square algorithm, until the computed natural frequencies and associated mode shapes match the measured ones. This procedure is finally validated with field measurements collected on long and short cables. [less ▲]

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See detailNouvelle approche de la classification par rigidité des assemblages poutre-colonne en construction métallique
Geuzaine, Margaux ULiege

Master's dissertation (2018)

Stiffness classification criteria for rigid joints ensure that the replacement of their actual finite stiffness by an idealised infinite stiffness does not significantly influence the behaviour of the ... [more ▼]

Stiffness classification criteria for rigid joints ensure that the replacement of their actual finite stiffness by an idealised infinite stiffness does not significantly influence the behaviour of the structure during its analysis. The analysis of the structure is thus simplified, without overestimating its strength and underestimating its displacements. The current criterion mentioned in Eurocode 3, part 1-8, is very approximate. Some joints are therefore classified as semi-rigid or stiffened, which increases their cost, even if they are actually already rigid. The purpose of this work is to define a new, less restrictive but still safe, criterion. While the Eurocode 3 criterion limits the influence of the joints stiffness idealisation on the stability of the structure, other criteria focus on its resistance and its transversal displacement. They are established in this work using the Merchant-Rankine formula and the slope deflection method. After their detailed study, the most appropriate criterion is selected. It limits the influence of the stiffness idealisation of joints on the transversal displacement of a symmetrical one-span portal with hinged feet and, indirectly, on its resistance and its stability. Based on the equivalent structure principle with approximate transformation rules, a single criterion is determined for all the joints of a regular one-storey structure, then, an empirical method shows that the stiffness required for some joints depends on other joint stiffnesses. Finally, 3 classification criteria are defined: for one or more joints of a storey; for all the joints of a storey; for all the joints of the structure considering the most restrictive storey criterion. [less ▲]

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