A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Nonlinear Analysis Models for the Static and Dynamic Behaviour of Structural Cables
Cables are integral to the structural stability of cable-supported structures, emphasising the need for improving assessment models in evaluating the structural condition of cable-supported structures. This work aims at enhancing the systematisation of cable models, and focuses on the analysis and system identification of cables with nonlinear geometry and complex physical-mechanical interactions. It employs a modelling framework approach, utilising inverse analyses and parametric application of the Finite Element Method to evaluate cable behaviour. Following a discussion on assumptions, limitations, and applications of existing cable models, a categorised classification system is proposed. Two case studies are then presented, highlighting the influence of geometry, loading conditions, and bending stiffness on the cable contact point within supports. The introduction of a novel saddled cable model employs an efficient Finite Element framework to explore the impact of changing contact points on suspended cables and external tendons with curved deviators. Comparisons with modal properties obtained from on-site vibration measurements of an external tendon result in accurate tension force identification. Detailed descriptions of the effects of curved deviators on dynamic behaviour follow. Acknowledging that contact point identification significantly depends on bending stiffness and local interactions between cable wires, an investigation into the effects of inter-wire friction is conducted. The model, incorporating stored interlock cohesion between cable wires, demonstrates high accuracy compared to experimental data under varying tension forces. Throughout the discussions, comparisons with experiments, previous studies, and analytical solutions are provided. This work suggests that Finite Element frameworks could be developed into a parametric toolbox for cable analyses, showcasing the adaptability of the models in practical applications.
Nonlinear Analysis Models for the Static and Dynamic Behaviour of Structural Cables
Cables are integral to the structural stability of cable-supported structures, emphasising the need for improving assessment models in evaluating the structural condition of cable-supported structures. This work aims at enhancing the systematisation of cable models, and focuses on the analysis and system identification of cables with nonlinear geometry and complex physical-mechanical interactions. It employs a modelling framework approach, utilising inverse analyses and parametric application of the Finite Element Method to evaluate cable behaviour. Following a discussion on assumptions, limitations, and applications of existing cable models, a categorised classification system is proposed. Two case studies are then presented, highlighting the influence of geometry, loading conditions, and bending stiffness on the cable contact point within supports. The introduction of a novel saddled cable model employs an efficient Finite Element framework to explore the impact of changing contact points on suspended cables and external tendons with curved deviators. Comparisons with modal properties obtained from on-site vibration measurements of an external tendon result in accurate tension force identification. Detailed descriptions of the effects of curved deviators on dynamic behaviour follow. Acknowledging that contact point identification significantly depends on bending stiffness and local interactions between cable wires, an investigation into the effects of inter-wire friction is conducted. The model, incorporating stored interlock cohesion between cable wires, demonstrates high accuracy compared to experimental data under varying tension forces. Throughout the discussions, comparisons with experiments, previous studies, and analytical solutions are provided. This work suggests that Finite Element frameworks could be developed into a parametric toolbox for cable analyses, showcasing the adaptability of the models in practical applications.
Nonlinear Analysis Models for the Static and Dynamic Behaviour of Structural Cables
2025-02-16
Theses
Electronic Resource
English
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