This paper gives an overview of wind-induced galloping phenomena, describing its manifold features and the many advances that have taken place in this field. Starting from a quasi-steady model of aeroelastic forces exerted by the wind on a rigid cylinder with three degree-of-freedom, two translations and a rotation in the plane of the model cross section, the fluid–structure interaction forces are described in simple terms, yet suitable with complexity of mechanical systems, both in the linear and in the nonlinear field, thus allowing investigation of a wide range of structural typologies and their dynamic behavior. The paper is driven by some key concerns. A great effort is made in underlying strengths and weaknesses of the classic quasi-steady theory\ud
as well as of the simplistic assumptions that are introduced in order to investigate such complex phenomena through simple engineering models. A second aspect, which is crucial to the authors’ approach, is to take into account and harmonize the engineering, physical and mathematical perspectives in an interdisciplinary way—something which does not happen often. The authors underline that the quasi-steady approach is an irreplaceable tool, tough approximate and simple, for performing engineering analyses; at the same time, the study of this phenomenon gives origin to numerous problems that make the application of high-level mathematical solutions particularly attractive. Finally, the paper discusses a wide range of features of the\ud
galloping theory and its practical use which deserve further attention and refinements, pointing to the great potential represented by new fields of application and advanced analysis tools
The design of Tuned Mass Dampers (TMD) to satisfy serviceability requirements is becoming more and more usual in the current design of footbridges. This paper analyzes the TMD design for the mitigation of pedestrian-induced vibrations with three main objectives: the introduction of a specific TMD optimization criterion for pedestrianinduced vibrations of footbridges, a critical analysis of the applicability to this specific loading scenario of classic literature optimization criteria, and a quantification of the TMD efficiency in the reduction of the footbridge acceleration. A numerical optimization criterion is proposed, based on the maximization of an efficiency factor, defined as the ratio between the uncontrolled acceleration standard deviation and the controlled one. Optimum TMD parameters are compared with classic criteria given by the literature. A possible modification of TMD parameters that permits to keep the TMD relative displacement within prescribed limits (aspect that is often a technical requirement in the TMD design) is also discussed. Monte Carlo simulations are carried out in order to confirm the validity of the standard deviation-based optimization for the reduction of the maximum dynamic response of the bridge. An application to a real footbridge is finally presented
In this paper, an equivalent one-dimensional beam model immersed in a three-dimensional space is proposed\ud
to study the aeroelastic behavior of tower buildings: linear and nonlinear dynamics are analyzed through a simple but\ud
realistic physical modeling of the structure and of the load. The beam is internally constrained, so that it is capable to\ud
experience shear strains and torsion only. The elasto-geometric and inertial characteristics of the beam are identified from\ud
a discrete model of three-dimensional frame, via a homogenization process. The model accounts for the torsional effect\ud
induced by the rotation of the floors around the tower axis; the macroscopic shear strain is produced by bending of the\ud
columns, accompanied by negligible rotation of the floors. Nonlinear aerodynamic forces are evaluated through the quasisteady\ud
theory. The first aim is to investigate the effect of mechanical and aerodynamic coupling on the critical galloping\ud
conditions. Furthermore, the role of aerodynamic nonlinearities on the galloping post-critical behavior is analyzed through\ud
a perturbation solution which permits to obtain a reduced one-dimensional dynamical system, capable of capturing the\ud
essential dynamics of the problem
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