Seismic Vulnerability and Fragility of Existing Italian Industrial Steel Buildings

Formisano, Antonio; Lorenzo, Giusy Di; Iannuzzi, Ida; Landolfo, Raffaele

doi:10.2174/1874149501711011122

Cited by 32 publications

(13 citation statements)

References 6 publications

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“…The purpose of the steel jacketing is to increase the low shear strength of the elements (as a result of the lack of stirrups) and, in particular for the columns, to increase the bearing capacity due to the concrete confinement effect. It is to note that also the FRP wrapping allows to have a good increase of confinement action (Formisano et al, 2006(Formisano et al, , 2017bLaterza et al, 2017). However, the steel jacketing has been chosen because it allowed an higher increase of the flexural capacity of the members, given a fixed economical threshold.…”

Section: Upgrading Operationsmentioning

confidence: 99%

Structural Assessment and Upgrading for an Old Building Belonging to an Historical Multi-Sports Center in Naples

Miano

Chiumiento

Saggese³

2019

Front. Built Environ.

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A significant number of non-ductile existing reinforced concrete frame buildings, built in different seismic regions around the world but without adequate seismic detailing requirements, suffered damages, or collapse after past earthquakes. In fact, these reinforced concrete frame buildings are much more susceptible to high level of damage or to collapse than modern code-conforming frames. A crucial issue in the community of the earthquake engineering is the assessment and the upgrading of these non-ductile reinforced concrete structures. In particular, a careful assessment of the existing buildings is very important in order to understand the failure mechanisms that govern the achievement of predefined limit states or the collapse of the structures. Only after an in depth seismic assessment, the best upgrading/retrofit strategy can be designed and applied to the structure. In some cases, the historical value of these buildings makes the assessment procedure and the upgrading design more complicated due to the constraints related to the limited possibility of interventions. In this work, a building belonging to an old multi-sports center, is used as case study. The complex orbits around the soccer stadium called Collana and located in Naples. This soccer stadium was initially built in the late '20s and then it was completely rebuilt in the postwar period and used as a sports center for different sporting activities. Currently, the complex includes a soccer field, an athletic track, three indoor gyms, three tennis fields, a medical center sports, and the indoor pool building investigated herein. The analysis of seismic vulnerability implemented for the case study building shows an unsafe condition under both vertical and seismic loads. The building upgrading is provided choosing the best strategy among different options in order to achieve a certain predefined threshold of the seismic safety for the building. Definitively, the paper presents a real upgrading design case study for a building belonging to an historical complex. Assessment and upgrading are shown based both on linear and dynamic non-linear analyses procedures. Finally, the effectiveness of the structural interventions of upgrading is measured coherently with the new Italian guidelines for seismic risk classification of constructions.

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Section: Upgrading Operationsmentioning

confidence: 99%

Structural Assessment and Upgrading for an Old Building Belonging to an Historical Multi-Sports Center in Naples

Miano

Chiumiento

Saggese³

2019

Front. Built Environ.

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“…Steel structures are widely used in seismic areas since they guarantee ductile and dissipative behavior by means of localized plastic deformations [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. Among the wide range of structural typologies, moment resisting frames (MRFs) are the most ductile due to redundancy that guarantees plastic redistribution in plastic hinges at the beam ends.…”

Section: Introductionmentioning

confidence: 99%

The Performance of Preloaded Bolts in Seismically Prequalified Steel Joints in a Fire Scenario

et al. 2020

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Seismically pre-qualified beam-to-column joints guarantee large ductility in seismic scenarios thanks to the effectiveness of the design rules and technological requirements that are devoted to avoiding the failure of brittle components (i.e., bolts and welds). However, their performance under different severe actions like those induced by fire has not been properly investigated. Therefore, a parametric study based on finite element simulations has been carried out with the aim to verify the effectiveness of local details of seismically prequalified joints under fire. Finite element analyses were carried out on beam-to-column assemblies sub-structured from a reference archetype building accounting for both material and geometrical imperfections. The bolts’ internal actions were monitored in all the investigated specimens varying the applied vertical loads. The results show that the seismic design rules adopted to size the bolts are effective to resist the large increase in shear forces in the bolts occurring under fire. Thus, the investigated joints provide satisfactory ductility and rotation capacity at high temperature preventing the failure of bolts; further analysis could be conducted to investigated the fire performance of the investigated joints in a seismic scenario.

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“…Nevertheless, other solutions, based on the use of steel elements, such as steel bracings [6,7], have been conceived; even though they are much more susceptible to stability issues and corrosion [8], they are able to provide a high performance because of the high ductility and good mechanical properties of cross-sections that they offer [9,10]. These steel devices can also be used for the seismic retrofitting of reinforced concrete or masonry structures [11,12].…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Moment-Resisting Frames with Conventional and Innovative Connections

et al. 2020

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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.

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Seismic Vulnerability and Fragility of Existing Italian Industrial Steel Buildings

Cited by 32 publications

References 6 publications

Structural Assessment and Upgrading for an Old Building Belonging to an Historical Multi-Sports Center in Naples

Structural Assessment and Upgrading for an Old Building Belonging to an Historical Multi-Sports Center in Naples

The Performance of Preloaded Bolts in Seismically Prequalified Steel Joints in a Fire Scenario

Seismic Behavior of Moment-Resisting Frames with Conventional and Innovative Connections

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