Floor response spectra in RC frame structures designed according to Eurocode 8

© 2015 Springer Science+Business Media Dordrecht Nonstructural components (NSCs) should be subjected to a careful and rational seismic design, in order to reduce the economic loss and to avoid threats to the life safety, as well as what concerns structural elements. The design of NSCs is based on the evaluation of the maximum inertia force, which is related to the floor spectral accelerations. The question arises as to whether Eurocode 8 is able to predict actual floor response spectral accelerations occurring in structures designed according to Eurocode 8. A parametric study is conducted on five RC frame structures in order to evaluate the floor response spectra. The structures, designed according to Eurocode 8, are subjected to a set of earthquakes, compatible with the design response spectrum. Time-history analyses are performed both on elastic and inelastic models of the considered structures. Eurocode formulation for the evaluation of the seismic demand on NSCs does not well fit the numerical results. Some comments on the target spectrum provided by AC 156 for the seismic qualification of NSC are also included

ANALYSIS OF COMBINED EMG AND JOINT ANGULAR VELOCITY FOR THE EVALUATION OF ECCENTRIC/CONCENTRIC CONTRACTION IN SKIING

The purpose of this study was the introduction of a method combining the joint angular velocity and the EMG signals for a biomechanical evaluation of the eccentric/concentric contraction patterns of major muscles used in alpine skiing. The adopted approach was applied to three types of slalom courses: racing, training and recreational slaloms. The introduction of a pseudo-Muscular-Work allowed to define a Ratio between Eccentric and Concentric muscular activation states that, compared to simple on-off timing criteria, resulted to reveal more consistently the amount of eccentric muscle mechanical work

Vibroacoustic performances of an acoustic box through hybrid FE-SEA method

VIBROACOUSTIC PERFORMANCES OF AN ACOUSTIC BOX THROUGH HYBRID FE-SEA METHO

Multiscale Heat, Air and Moisture Modelling and Simulation

no abstrac

THE EFFECT OF WALKING SPEED AND SKILL LEVELS ON ELBOW FLEXION AND UPPER LIMB EMG SIGNALS IN NORDIC WALKING: A PILOT STUDY

Aims of the study were to evaluate the effect of the walking speed on the elbow’s range of motion and the EMG activity levels on eight upper limb muscles when performing level Nordic Walking in outdoor sessions. The study involved both skilled Nordic Walking instructors and unskilled beginners to highlight the effect of a correct technical execution on the elbow’s flexion angle and the EMG signals. All the subjects performed also level walking tests without poles at the same speeds of the NW tests: the EMG activation levels during walking were taken as control values of each subject to estimate the additional activation due to the poles

Stability analysis of natural convective flows in horizontal annuli: effects of axial and radial aspect ratios

International audienceLinear stability analyses for two-dimensional natural convection in horizontal air-filled annuli are performed for three-dimensional perturbations and radius ratios in the range 1.2 ≤ R ≤ 3. Flow transitions from moderate to large gap annuli, which have not been reported before, are thoroughlyinvestigated. As a result, stability diagrams are obtained for finite and for infinite length annuli. The leading disturbances and threshold values are found to agree well with experimental data and three-dimensional numerical solutions. Three-dimensional simulations were also carried out toexamine the influence on the flow stability of no-slip boundary conditions at the end walls

Stability of free convection in air-filled horizontal annuli: influence of the radius ratio

International audienceLinear stability of two-dimensional natural convection in air-filled horizontal annuli is numerically investigated for radius ratios in the range 1.2 less than or equal to R less than or equal to 3 and for Rayleigh numbers less than 10(4). Bifurcation diagrams are obtained for various radius ratios and the main thresholds are tracked as a function of R. A new instability mode has been highlighted which breaks the symmetry of the basic flow. This result demonstrates the need of modeling the annular gap without assuming flow symmetry. In addition to bifurcation maps drawn in the Rayleigh number-radius ratio plane, a map of possible flow patterns is also established. This map allows to foresee the number of solutions and the corresponding flow structures. (C) 2004 Elsevier Ltd. All rights reserved

Lo sfogo dell'amante e la 'retorica' del prologo (Plauto Merc. 1-39)

In the Mercator\u2019s prologue the necessity to tell the background overlaps the ethos of the lover, who, through his unruly language, fluctuates between the \u2018talking too much\u2019 and the \u2018talking too little\u2019. These categories bring to a metapoetic and \u2018rhetoric\u2019 reflection on the composition and modality of the prologue itself. If the invitation to the brevity is a constant scenic standard in all the Plautus comedies, the opportunity to \u2018speak little\u2019 is necessary especially in the prologues, in order to receive the public\u2019s benignitas (in other words, the willingness to listen). The Mercator\u2019s long exposition therefore represents a playful infraction, which subverts this obligatory rule in the prologizon\u2019s exposition. When in de or. 2 , 326 ff. Cicero shows the limits of a brevitas that provides only the essential details about the events, he uses the example of the Terentius\u2019 Andria first scene, demonstrating on the contrary the qualities of a varied and dwelled and, therefore, effective and enjoyable narratio