PICCARDO , Giuseppe

A global model is identified inclusive of any whatsoever aeroelastic phenomenon, the linearization of which allows study of incipient aerodynamic instability through a solution methodology falling within the domain of the poles. With the variation of the mean stream velocity, study is made of the system's critical points and the form of the...

Nel presente capitolo sono trattate le oscillazioni strutturali aeroelastiche indotte da flussi subsonici ed i fenomeni di instabilità aerodinamica innescati dalla presenza delle forze di interazione fluido-struttura. Nel settore dell'ingegneria del vento, i fenomeni aeroelastici sono fino ad oggi classificati in quattro categorie principali:...

Although piezoelectric transducers are employed in a variety of fields, their application for vibration control of civil or industrial structures has not yet been fully developed, at the best of authors' knowledge. Thanks to a new generation of ever more performing piezoceramic materials and to the recent development of scientific proposals...

Gli studi originali sul fattore di raffica, sulla risposta massima e sulle forze statiche equivalenti riguardano le vibrazioni delle strutture nella direzione del vento. Le ricerche condotte nell'ultimo decennio in questo settore seguono due linee distinte: la prima è rivolta alla determinazione dei massimi effetti causati dalle vibrazioni...

A critical analysis of the procedures available in the literature for the serviceability assessment of footbridges in unrestricted pedestrian traffic conditions is presented. Based on a full probabilistic model of the loading, Monte Carlo simulations are carried out and a critical discussion concerning the role of the statistical distribution...

Modern footbridges can be very sensitive to walking-induced vibrations. The assessment of footbridge vibrations due to normal unrestricted pedestrian traffic is a topical problem in the serviceability analysis of these structures. In this paper real pedestrian traffic conditions are modeled probabilistically, considering several sources of...

The nonlinear random oscillations of a cable induced by a turbulent wind are investigated proponing a discrete model, with quadratic-cubic nonlinearities and parametric excitation terms arising from geometric and aerodynamic effects. The formulation is independent of the order of discretization adopted for representing the cable motion and the...

The nonlinear random oscillations of a cable induced by a turbulent wind are investigated proponing a discrete model, with quadratic-cubic nonlinearities and parametric excitation terms arising from geometric and aerodynamic effects. The formulation is independent of the order of discretization adopted for representing the cable motion and the...

Wind forces on structures are usually schematized by the sum of their mean static part and a nil mean fluctuation generally treated as a stationary process randomly varying in space and time. The multi-dimensional nature of such a process gives rise to relevant numerical efforts in order to carry out the dynamic analysis of the structural...

The assessment of footbridge vibrations due to normal unrestricted pedestrian traffic is a topical problem in the serviceability analysis of these structures. Based on a probabilistic model of the parameters involved, the authors of the present paper have analytically derived an equivalent spectral model for the loading induced by pedestrian...

Modern footbridges can be very sensitive to walking-induced vibrations. The assessment of footbridges vibrations due to flows of unsynchronized pedestrians is a topical problem in the serviceability analysis of these structures. In this paper real pedestrian traffic conditions are modeled probabilistically, considering several sources of...

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Pedestrian-induced actions on footbridges are commonly schematized, at the design stage, as a resonant sinusoid moving across the bridge with speed related to the walking frequency. In this paper, the equation of motion of a footbridge crossed by a moving sinusoidal load, representing a pedestrian, is solved by a perturbation technique, the...

The aeroelastic behaviour of a flexible elastic suspended cable driven by mean wind speed, blowing perpendicularly to the cable's plane, is investigated. By applying the Galerkin procedure to the partial differential equations of motion and using an in-plane and an out-of-plane mode as shape functions, a two-d.o.f. model is derived. The...

This paper deals with the vibration serviceability analysis of footbridges subjected to realistic pedestrian traffic conditions, based on a probabilistic characterization of pedestrian-induced forces. The dynamic response to three different loading conditions is analysed through a non-dimensional approach, which permits the identification of...

In the present paper the nonlinear discrete model of a cable driven by a turbulent wind is proposed in order to take into account an arbitrary number of structural modes and of wind modes, obtaining a system of firstorder ordinary differential equations driven by a vector of independent random processes. Nonlinearities and parametric-excitation...