A SEMI-ANALYTICAL MODEL FOR DISSIPATIVE SHEAR LINKS: EXPERIMENTAL TESTS AND NUMERICAL ANALYSES

Abstract eng:
Eccentrically braced frames (EBF) represent an optimal structural solution for seismic prone areas, being characterized by a high dissipative capacity, able to withstand strong seismic events, and by a relevant elastic stiffness, able to avoid (or limit) the damage of non-structural elements during low-to-moderate seismic events. The knowledge of the cyclic behaviour of the dissipative link elements is required to perform reliable and accurate nonlinear analyses and, in particular, to finally optimize the design of EBFs and their structural performance. Notwithstanding such aspects, in the current scientific literature few models are proposed for the modelling of EBFs equipped with short/shear links, mainly adopting simple bilinear springs with kinematic hardening constitutive laws that are not always able to correctly represent the real experimental behaviour of EBFs, especially for what concerns the influence of the hardening phenomena. In the present work, a semianalytical model for short/shear link is proposed and calibrated basing on the results of experimental tests on real-scale one store/one bay EBFs equipped with horizontal and vertical dissipative elements. The main aim of the proposed model consists in the ability to represent the cyclic/seismic behaviour of EBFs with more accuracy with respect to what actually used in the current scientific works and, at the same, with a low computational burden with respect to solid models, becoming then an optimal solution for the implementation in design models and for the representation of multi-storey buildings’ behaviour.

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