Abstract
The paper discusses the role of dynamic testing in the study of cable structures. In this context, the identification of cable force based on vibration measurements is discussed. Vibration and damping assessment are then introduced as the focus of dynamic monitoring systems, and particular aspects of the structural behaviour under environmental loads are analysed. Diverse application results are presented to support the discussion centred on cable-stayed bridges, roof structures, a guyed mast and a transmission line.
Highlights
IntroductionThe construction of lightweight structures covering progressively longer spans and employing cables as supporting elements has increased worldwide, leading to very flexible applications in bridges, roofs and special structures
The construction of lightweight structures covering progressively longer spans and employing cables as supporting elements has increased worldwide, leading to very flexible applications in bridges, roofs and special structures. These are generally characterised by complex structural behaviour, marked by a significant geometric nonlinearity, high deflections under service loads, a high number of vibration modes closely spaced in frequency, several of which of local nature, and proneness to vibrations induced by wind, traffic and human actions
The fact that the geometry and the structural behaviour of flexible lightweight structures is determined by the level of cable pre-stress makes their construction complex, demanding the accurate installation of prestress
Summary
The construction of lightweight structures covering progressively longer spans and employing cables as supporting elements has increased worldwide, leading to very flexible applications in bridges, roofs and special structures These are generally characterised by complex structural behaviour, marked by a significant geometric nonlinearity, high deflections under service loads, a high number of vibration modes closely spaced in frequency, several of which of local nature, and proneness to vibrations induced by wind, traffic and human actions. The fact that the geometry and the structural behaviour of flexible lightweight structures is determined by the level of cable pre-stress makes their construction complex, demanding the accurate installation of prestress This often determines the need for assessment of cable force during and after construction and is relevant for roof structures and cable-stayed bridges. The need to detect damage at early stages, enhanced by the potential fatigue effects caused by vibrations, constitute an additional argument to the present trend to monitor the structural behaviour of important infrastructures
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