Reliability of Systems Equipped With Viscous Dampers With Variable Properties

Dall’Asta, Andrea; Ragni, L.; Scozzese, Fabrizio; Tubaldi, Enrico

doi:10.7712/100016.2201.7987

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…In Dall'Asta et al (2009) [22], an alternative distribution criterion was aimed at regularizing the fundamental mode shape of the braced structure.…”

Section: Introductionmentioning

confidence: 99%

Seismic Retrofit of Warehouses with Masonry Infills and Glazed Curtain Walls through Hysteretic Braces: Refinement of the Italian Building Code Provisions

Gandelli,

Pertica,

Facconi

et al. 2023

Applied Sciences

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A refined design procedure for the seismic retrofit of warehouses or, more generally, single-storey RC frames bounded by “drift-sensitive” masonry infills and glazed curtain walls, is proposed in this paper by means of hysteretic braces. The calculation method is based on displacement-based design (DBD) procedures in which both the as-built frame and the dissipative braces are modelled through simple linear equivalent SDOF systems arranged in parallel. In this regard, with respect to the provisions of the Italian Building Code, two refinements are introduced: (1) the definition of two performance targets tailored to the protection of glazed curtain walls (among most expensive non-structural components) and to ensure an acceptable level of damage level for masonry infills; and (2) the adoption of a more accurate formulation for the estimation of the equivalent viscous damping developed both by the main frame and the dissipative braces. The refined design method is applied to a case-study building and the achievement of the performance targets is verified through NLTH analyses.

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“…In Dall'Asta et al (2009) [22], an alternative distribution criterion was aimed at regularizing the fundamental mode shape of the braced structure.…”

Section: Introductionmentioning

confidence: 99%

Seismic Retrofit of Warehouses with Masonry Infills and Glazed Curtain Walls through Hysteretic Braces: Refinement of the Italian Building Code Provisions

Gandelli,

Pertica,

Facconi

et al. 2023

Applied Sciences

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“…Au (2005) [25] proposed a method to obtain statistical information about the sensitivity of the reliability of structures with respect to different ranges of model parameters, based on the solution of an augmented reliability problem, in which the system parameters are modelled as random variables with fictitious probability distribution, and on the use of Subset Simulation [26]. Such strategy can be useful for a preliminary sensitivity investigation, as done for instance in the work of Dall'Asta et al (2016) [27] to explore the influence of viscous dampers with variable properties on the seismic response of simple structural systems represented by a single degree of freedom (SDOF) model. However, further insights are needed to establish this influence on more realistic structural systems.…”

Section: Introductionmentioning

confidence: 99%

Seismic risk sensitivity of structures equipped with anti-seismic devices with uncertain properties

2019

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Damping and isolation devices are often employed to control and enhance the seismic performance of structural systems. However, the effectiveness of these devices in mitigating the seismic risk may be significantly affected by manufacturing tolerances, and systems equipped with devices whose properties deviate from the nominal ones may exhibit a performance very different than expected. The paper analyzes this problem by proposing a general framework for investigating the sensitivity of the seismic risk of structural systems with respect to system properties varying in a prescribed range. The proposed framework is based on the solution of a reliability-based optimization (RBO) problem, aimed to search for the worst combination of the uncertain anti-seismic device parameters, within the allowed range of variation, that maximizes the seismic demand hazard. A hybrid probabilistic approach is employed to speed up the reliability analyses required for evaluating the objective function at each iteration of the RBO process. This approach combines a conditional method for estimating the seismic demand at a given intensity level, with a simulation approach for representing the seismic hazard. The proposed method is applied to evaluate the influence of the variability of the properties of linear and nonlinear fluid viscous dampers on the seismic risk of a low-rise steel building. The study results show that the various response parameters considered are differently affected by the damper property and unveil the capability of the proposed approach to evaluate the potentially worst conditions that jeopardize the system reliability.

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Reliability of Systems Equipped With Viscous Dampers With Variable Properties

Abstract: Abstract. Viscous dampers are energy dissipation devices widely

Cited by 2 publications

References 22 publications

Seismic Retrofit of Warehouses with Masonry Infills and Glazed Curtain Walls through Hysteretic Braces: Refinement of the Italian Building Code Provisions

Seismic Retrofit of Warehouses with Masonry Infills and Glazed Curtain Walls through Hysteretic Braces: Refinement of the Italian Building Code Provisions

Seismic risk sensitivity of structures equipped with anti-seismic devices with uncertain properties

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