A simple and efficient ‘complete dynamic approach’ is proposed, named GBT-D, to evaluate a suitable basis of modes for the elastic analysis thin-walled members in framework Generalized Beam Theory (GBT). The includes conventional non-conventional modes, latter accounting transverse extension membrane shear strain plate elements forming cross-section, which identically vanish former set. method relies on solution two distinct eigenvalue problems, governing in-plane out-of-plane free...

Large-Eddy Simulations were conducted to investigate accelerated flows around a square cylinder. The study explores flow characteristics for Gaussian-type accelerations of the inflow within range Reynolds numbers Re=1.720×104 Re=6.536×104. Three different acceleration intensities same Re have been considered. For all analyzed values, time cells with constant frequency in vortex shedding identified agreement experimental findings Brusco et al. (2022a). temporal behavior vorticity field...

By analysing a set of thunderstorm-induced events acquired on the Italian north-west coast, separation relevant wind velocity signals into time-varying mean and residual fluctuation is considered. It assumed that, within structural design process, former used for quasi-steady evaluation aerodynamic loads latter to estimate dynamic response. A procedure based continuous wavelet transform proposed obtain its outcomes are compared with those different moving average techniques. The filtering...

Aerodynamic and pressure coefficients of a sectional model sharp-edged square cylinder, at zero incidence angle, are experimentally evaluated in accelerating flow conditions through the use multiple-fan wind tunnel. Different unsteady flows reproduced, characterized by parameters which dictate initial target velocities, as well acceleration deceleration, temporal spacing between ramp-up ramp-down. The turbulent reproduced during campaign consistent with those typical full-scale downbursts....

A linear model of curved, prestressed, no-shear, elastic beam, loaded by wind forces, is formulated.The beam assumed to be planar in its reference configuration, under own weight and static forces.The incremental equilibrium equations around the prestressed state are derived, which shear forces condensed.By using a constitutive law accounting for damping inertial effects, complete motion obtained.They then greatly simplified estimating order magnitude all their terms, hypotheses small...

Along-wind, crosswind, and torsional vibrations of structures are different aspects the same physical phenomenon. Despite this fact, each aspect has been object numerous studies involving lines research that have frequently independent other. These often characterized by notable inconsistencies clashes. This paper proposes a single coherent formulation provides compact expressions for estimating along-wind, response based on generalized gust factor approach. It presents wind-loading model...

This article describes the results of extensive full-scale experiments carried out on two lively footbridges recently built in Milan, Italy. The objective study was to assess dynamic characteristics bridges and expected vibration level induced by pedestrians. A preliminary analysis revealed their potential sensitivity human-induced vibrations vertical direction. Two sets were out, one before after installation tuned mass dampers. Furthermore, bridge during a marathon event recorded analyzed....

An extensive experimental campaign has been carried out in a multiple-fan wind tunnel to study the effects of flow acceleration on sectional model sharp-edged square cylinder. Different levels positive and negative are reproduced, which compatible with those induced by full-scale thunderstorm outflows. Various initial final conditions also explored and, all conditions, multiple test repeats order obtain satisfactory ensemble averages. Particular attention is devoted acquisition signals...

This paper proposes a continuous perturbation treatment of the nonlinear equations cable, which is characterized by possible aeroelastic instability and internal resonance conditions. The objective to evaluate influence stable modes (called passive) usually ignored when discretizing model. first step concerns description structural equilibrium path under action mean wind forces. Then, multiple scale analysis integro-differential motion performed. Analyzing stability reduced system, existence...

The dynamic response of Euler-Bernoulli beams to resonant harmonic moving loads is analysed. non-dimensional form the motion equation a beam crossed by load solved through perturbation technique based on two-scale temporal expansion, which permits straightforward interpretation analytical solution. expressed function slowly modulated in time, and maximum identified with slow-varying amplitude. In case ideal elastic rotational springs at support points, starting from expressions for...