1,721,398 research outputs found
Valutazione del contributo dissipativo dei pannelli di completamento per la progettazione antisismica dei telai di acciaio
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BULLONERIA STRUTTURALE. QUADRO NORMATIVO. FABBRICAZIONE – CONTROLLI E PROVE – CERTIFICAZIONI
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Structural measures for improving progressive collapse resistance of multi-storey steel buildings under accidental actions
No full textBuckling Inhibited Shear Panel as a New Damper Based on the Development of the Brb Concept in the 2D Space
No full textIn the current paper, an innovative dissipative shear panel for seismic protection of steel and reinforced concrete buildings is dealt with. It represents an extension of the Buckling Restrained Brace concept in the bi-dimensional space, as it is based on the use of a metal plate, made of aluminum or steel, representing the core of a damper whose hysteretic response could be properly controlled by an external jacket able to inhibit either the most important or, even, all the buckling phenomena under shear forces. The main results of an experimental campaign carried out under cyclic loads on both partially and totally Buckling Inhibited Shear Panels, made of different metallic materials and thicknesses, are analyzed and presented. Two different solutions are analyzed. The former is conceived in order that the buckling inhibition system restrains the out-of-plane displacements of the plate portions centered around the two diagonals, which are more sensible to the firsts and most important critical modes. The latter is based on devices able to restrain the out-of-plane displacements of the whole system. The obtained results allow to observe the significant improvement of dissipative capacity that the buckling inhibition devices are able to provide. Nevertheless, it is pointed out that for reduced thicknesses of the base plate, the system performance could be jeopardized due to the gap between the inhibiting and the inhibited parts within which buckling phenomena could develop
Design of low strength-high hardening metal multi-stiffened shear plates
No full textIn this paper design curves for low strength-high hardening metal multi-stiffened shear plates are provided, based on both experimental tests and parametric numerical analyses. To this aim, an almost pure aluminum is considered as base material, it being characterized by a yielding stress point of about 20. MPa and a hardening ratio higher than 4.An "initial stability" curve, which is useful to determine service limit conditions for metal plates in shear, is outlined with the aim of establishing the early buckling phenomena. Then, design curves providing the reduction factor of the ultimate strength of the plate in shear duly accounting for buckling phenomena are proposed as a design tool for system dimensioning.Finally, the issue related to the design of stiffeners, which are applied to delay shear buckling and to improve the plate hysteretic performance, is investigated. The current study represents an extension of the outcomes provided in a previous paper [4] (Brando and De Matteis, 2011), where the above design curves have been provided for hardening aluminum shear plates without stiffeners
Experimental and numerical analysis of a multi-stiffened pure aluminium shear panel
No full textThe current paper deals with a detailed numerical study carried out on a pure aluminium shear panel and implemented through a FEM numerical model calibrated on the results obtained by an experimental test. The comparison between experimental and numerical data, in terms of dissipative capacity, maximum hardening ratio, secant shear stiffness and equivalent viscous damping factor, is carried out in order to show that the proposed model is reliable enough to well interpret the actual behaviour of the specimen, which exhibits many buckling phenomena and large plastic deformations. The proposed model is therefore profitably used to detect the exact displacement levels corresponding to the activation of the main buckling phenomena, as well as the stresses acting on the boundary bolted connections, which may result the weak point of the system. Moreover, the main outcomes of a parametrical study, which are implemented on the basis of the calibrated numerical model, are critically discussed and properly analysed, in order to define the erosion factor of the shear strength due to buckling
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