Abstract
In the last few decades, increasing efforts have been devoted to the development of beam-to-column connections able to accommodate the local ductility demand dissipating, contemporaneously, the seismic input energy. Among the typologies proposed, the so-called RBS (Reduced Beam Section) has gained wide acceptance in the construction market, leading to easy-to-construct and cost-effective solutions. As an alternative, new proposals based on the inclusion of friction devices in beam-to-column joints have recently been made. Such a practice has the merit, in case of destructive events, of exhibiting wide and stable hysteretic cycles concentrating damage in elements that undergo only minor yielding. Both RBS and friction joints have been widely studied, carrying out experimental tests on sub-assemblies investigating their cyclic rotational response. Nevertheless, the available experimental results on full-scale structures equipped with these connections are still quite limited. This is the reason why two experimental campaigns aimed at performing pseudo-dynamic testing of a full-scale two-storey steel building equipped with RBS and friction connections have been planned at the STRENGTH (STRuctural ENGineering Test Hall) Laboratory of the University of Salerno. The first experimental campaign with the structure equipped with RBSs has already been performed; the connections showed higher resistance than expected, and exhibited brittle fracture due to cyclic fatigue. The second campaign has not yet been carried out, but in this paper the blind analysis of the supposed behavior is reported. It is expected that the friction joints allow to dissipate the seismic input energy without any structural damage in the members, but only through the friction pads of the devices, which can be easily replaced at the end of a severe seismic event.
Highlights
It is well kNown that in the last decades, remarkable changes have affected the field of civil engineering; the most relevant example of the previous statement can be referred to the conventional way of designing seismic-resistant structures
This paper has presented the results of a full-scale experimental and numerical activity on a two-storey building mock-up composed of two equal frames extracted from a more complex performed on a two-storey building mock-up composed of two equal frames extracted from a more reference structure
The structure is endowed with Reduced Beam Section (RBS), while in the second phase, complex reference structure
Summary
It is well kNown that in the last decades, remarkable changes have affected the field of civil engineering; the most relevant example of the previous statement can be referred to the conventional way of designing seismic-resistant structures. For such a reason, many research efforts have been devoted to conceiving devices able to dissipate the seismic input energy preventing structural collapses, protecting human lives and safeguarding the economic impacts and the full-operativity of structures after the occurrence of seismic events. Referring to reinforced concrete structures, the isolators [3] are probably the most kNown devices in the mass culture, which are often exploited by designers since their adoption enables engineers to design more so-called superstructures Such a technology can be applied in the case of seismic retrofitting, which is currently a very popular topic [4,5]
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