An Equivalent Non-uniform Beam-like Model for Dynamic Analysis of Multi-storey Irregular Buildings

Greco, Annalisa; Fiore, Ilaria; Occhipinti, Giuseppe; Caddemi, S.; Spina, Daniele; Caliò, Ivo

doi:10.20944/preprints202002.0371.v1

Cited by 9 publications

(1 citation statement)

References 21 publications

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“…In order to evaluate the seismic risk of urban settlements it should be necessary, in principle, to estimate the seismic vulnerability of all the buildings in the considered area. This estimate needs in-depth knowledge of the geometric and mechanical characteristics of the load-bearing structures of each building and requires the calculation of appropriate safety coefficients with respect to possible seismic events [1][2][3][4][5][6][7]. Taking into account a great number of buildings this task would require a large amount of data and a huge computational effort.…”

Section: Introductionmentioning

confidence: 99%

Seismic risk assessment of a large metropolitan area by means of simulated earthquakes

Fischer

Barreca

Greco

et al. 2022

Preprint

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The determination of seismic risk in urban settlements has received increasing attention in the scientific community during the last decades since it allows to identify the most vulnerable portions of urban areas and therefore to plan opportune strategies for seismic risk reduction. In order to accurately evaluate the seismic risk of urban settlements it should be necessary to estimate in detail the seismic vulnerability of all the existing buildings in the considered area. This task could be very cumbersome due to both the great number of information needed to accurately characterize each building and the huge related computational effort. Several simplified methods for the assessment of the seismic vulnerability of existing buildings have been therefore presented in the literature. In order to estimate the occurrence of damage in buildings due to possible seismic excitations, the published studies usually refer to response spectra evaluated according to seismic events expected in the territory with assumed probabilities. In the present paper seismic events are instead simulated using a modified Olami-Feder-Christensen (OFC) model, within the framework of Self-Organized Criticality. The proposed methodology takes into account some geological parameters in the evaluation of the seismic intensities perceived by each single building, extending the approach presented in a previous study of some of the authors. Here, a large territory in the Sicilian oriental coast, the metropolitan area of Catania (Sicily), which includes several urbanized zones with different features, has been considered as a new case study. Applications of the procedure are presented first with reference to seismic sequences of variable intensity, whose occurrence is rather frequent in seismic territories, showing that the damage can be progressively accumulated in the buildings and may lead to their collapse even when the intensities of each single event are moderate. Moreover, statistically significant simulations of single major seismic events, equivalent to a given sequence in terms of produced damages on buildings, are also performed. The latter match well with a novel a-priori risk index, introduced with the aim of characterizing the seismic risk of each single municipality in the considered metropolitan area. The proposed procedure can be applied to any large urbanized territory and, allowing to identify the most vulnerable areas, can represent an useful tool to prioritize the allocation of funds. This could be a novelty for risk policies in many countries in which public subsidies are currently assigned on a case-by-case basis, taking into account only hazard and vulnerability. The use of a risk index in the allocation process will allow to include the relevant role of exposure.

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Section: Introductionmentioning

confidence: 99%

Seismic risk assessment of a large metropolitan area by means of simulated earthquakes

Fischer

Barreca

Greco

et al. 2022

Preprint

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An inelastic beam-like model for nonlinear dynamic analyses of multi-storey buildings

Fiore,

Caddemi,

Caliò

et al. 2024

Engineering Structures

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A Method for Reducing of the Overall Torsion for Reinforced Concrete Multi-Storey Irregular Structures

Botiș

Cerbu

2020

Applied Sciences

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The uneven distributions of mass and stiffness in the case of multi-storey concrete buildings lead to a torsion sensitivity of those civil structures under dynamical loadings like earthquakes or wind and gusts. In order to minimize the overall torsion, it is imperatively necessary to reduce the distance between the centre of mass (CM) and centre of stiffness (CS) in the design stage. In this context, the main purpose of this paper is to present a theoretical method of reducing torsion by minimizing the distance between CM and CS at the level of each floor of the structure. Principal stiffness axes are also changed in convenient directions so that the movement of the structure leads to a favourable plastic mechanism in the fundamental mode of vibration. To achieve the goal, the main objective is to change the dimensions and orientations of the pillars located on the perimeter of the structures. The described method was used to study: irregular shaped structures in plan; structures with stairs or with central concrete core; structures with elevation retractions. The overall torsion reducing was achieved with Matlab programs, and the verification of the results was carried out by using the software ETABS 2016.

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An Equivalent Non-uniform Beam-like Model for Dynamic Analysis of Multi-storey Irregular Buildings

Cited by 9 publications

References 21 publications

Seismic risk assessment of a large metropolitan area by means of simulated earthquakes

Seismic risk assessment of a large metropolitan area by means of simulated earthquakes

An inelastic beam-like model for nonlinear dynamic analyses of multi-storey buildings

A Method for Reducing of the Overall Torsion for Reinforced Concrete Multi-Storey Irregular Structures

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