Upwards - Vertical extensions of masonry built heritage for sustainable and antifragile urban densification

Argenziano, Mario; Faiella, Diana; Bruni, F.; Angelis, Carmine De; Fraldi, Massimiliano; Mele, Elena

doi:10.1016/j.jobe.2021.102885

Cited by 9 publications

(11 citation statements)

References 22 publications

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“…In the research carried out so far by the authors, some existing buildings were chosen and analysed as case studies of vertical extension with IIS [32,33]. The case studies include low-rise masonry buildings in Pozzuoli, an Italian town close to Naples, where a recent plan has been issued for reconstructing the upper floors (demolished nearly forty years ago) of several buildings of the historic centre.…”

Section: Procedures Frameworkmentioning

confidence: 99%

“…This paper examines the interesting idea of utilizing the IIS to extend vertically existing buildings for addressing the increasing demand for real estate in contemporary cities with almost no land take [2,3,11,12,[31][32][33][34][35][36][37]. In earthquake-prone zones, IIS can prevent any increase in seismic effects, despite the increase in mass due to the vertical extension.…”

Section: Introductionmentioning

confidence: 99%

“…A first insight on this topic is provided by the authors in [32], in which a three-storey masonry building is selected as case study and extended by means of different two-storey steel structures, isolated at the base and erected on the top of the existing building. In [33], the authors developed a proof-of-concept study for the large-scale application of this strategy, with reference to the town of Pozzuoli (South Italy). Finally, a design procedure has been defined and illustrated in [31].…”

Section: Introductionmentioning

confidence: 99%

“…Other examples of IIS design spectra, derived for buildings characterized by different values of the fundamental period (i.e., T LS = 0.18, 0.55, 0.72, 0.81 s), are given in Figure 4 [33], where the base shear ratio (v = V b,IIS /V b,LS ) is chosen as response parameter and depicted as a function of the period of the isolation system T ISO . The displacement ratio, adopted for plotting the results in Figure 3b, could be chosen also in this case, with only a change in the y-axis scale but not in the results trend, due the linearity of the analysis.…”

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confidence: 99%

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Intermediate Isolation System with Nonlinear Lower Structure and Isolation System

et al. 2023

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This paper reports a study on the Intermediate Isolation System (IIS) applied to existing buildings. This kind of application is particularly suitable when a vertical addition is planned for buildings in seismic zones; in such a case, an isolation system can be placed at the base of the extension to prevent the increase, or, better, to reduce the seismic demand on the existing structure. In previous works, parametric response spectrum analyses have been carried out on lumped mass models by varying the period of the isolation system. As a result, a sort of IIS design spectrum has been derived and used for selecting design solutions for the vertical extension that minimize the overall seismic response. In this paper, the above design indications are assessed in the light of nonlinear time history analyses, accounting for the hysteretic response of the existing structure and the nonlinear behaviour of the isolation system. The IIS configurations are analysed and the results are discussed and compared in terms of peak response. In light of the obtained analysis results, the effectiveness and robustness of IIS applications for vertical extensions are discussed, and design implications are suggested.

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Section: Procedures Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Intermediate Isolation System with Nonlinear Lower Structure and Isolation System

et al. 2023

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“…The key design question, once the dynamic properties of the existing structure and the mass of the extension are set, is the choice of the period for the isolation system. As observed in, 14,15 the structural complex exhibits different vibration characteristics and seismic responses as a function of the isolation period; a complete picture of them is represented by the so-called IIS design spectrum (or non-conventional TMD design spectrum), [16][17][18] which, providing the maximum displacement response in the lower structure of IIS as a function of the isolation period, can be used as a design exploration tool. The IIS spectrum allows for a complete evaluation of all design configurations that can be obtained varying the value of isolation period.…”

Section: Introductionmentioning

confidence: 99%

A diagram‐based design procedure for Intermediate Isolation System in existing buildings with inelastic behavior

Esposito,

Faiella,

Mele

2024

Earthq Engng Struct Dyn

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Vertical extensions of existing buildings can be realized through Intermediate Isolation System (IIS): the extension, equipped with a base isolation system on the rooftop of the existing building, can work as a mass damper, thus reducing the seismic demand on the old structure. The idea proposed in this paper is to predict the elastic or inelastic response of the existing structure in the IIS configuration by means of the results of simple linear analyses. Parametric response spectrum analyses are performed on simplified two degree‐of‐freedom models by varying the mass ratio and the periods of both the existing building and the new isolated vertical extension. So‐called IIS design spectra are derived, and the results are provided as design charts. Given the period of the existing building and the mass ratio, the period of the new isolated vertical extension is selected to obtain the required/desired response of the existing building. For existing buildings working in the elastic field, the designer can derive the response of the existing building by utilizing the IIS design spectra as design charts. For existing building working in the inelastic field, the design charts can still be adopted, though within a more complex procedure, which accounts for two limit behaviors that the extended building exhibits in the inelastic field. The outlined design procedure is applied to some case studies and validated through the comparison with the results of nonlinear time history analyses.

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The Effect of Nonlinear Response of the Primary System in Nonconventional TMDs

Esposito

Faiella

Argenziano

et al. 2023

Lecture Notes in Civil Engineering

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Upwards - Vertical extensions of masonry built heritage for sustainable and antifragile urban densification

Cited by 9 publications

References 22 publications

Intermediate Isolation System with Nonlinear Lower Structure and Isolation System

Intermediate Isolation System with Nonlinear Lower Structure and Isolation System

A diagram‐based design procedure for Intermediate Isolation System in existing buildings with inelastic behavior

The Effect of Nonlinear Response of the Primary System in Nonconventional TMDs

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