Seismic vulnerability assessment of a high voltage disconnect switch

Paolacci, Fabrizio; Giannini, Renato; Alessandri, Silvia; Felice, Gianmarco de

doi:10.1016/j.soildyn.2014.09.014

Cited by 36 publications

(13 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other possible methods can be derived from the reliability theory, as for example the Effective Fragility Analysis, already proposed for the vulnerability assessment civil and industrial structures [26], [27], [28]. This method makes use of the Response Surface technique.…”

Section: Fragility Assessment Methodsmentioning

confidence: 99%

Seismic Fragility Analysis of Steel Storage Tanks

Paolacci¹,

Phan²,

Corritore³

et al. 2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

View full text Add to dashboard Cite

Earthquakes can cause significant damages to industrial liquid storage tanks resulting in losses of functionality, fires or environmental contamination due to the leakage of hazardous chemicals. Typical damages of ground supported tanks during past earthquakes were in the form of cracking at the corner of the bottom plate and compression buckling of tank wall due to uplift, sliding of the base, anchorage failure, sloshing damage around the roof, failure of piping systems and plastic deformation of base plate. Liquid tanks can be also located at some elevated positions due to operational purposes. This makes them susceptible to collapse due to increased base shears and overturning moments. The seismic response of elevated tanks has been widely investigated in the past considering different materials and configurations of support structures. This paper addresses the problem of elevated tanks with particular attention focused on the steel storage tanks resting on short RC columns. The vulnerability of a real example of elevated tanks is assessed though the probabilistic analysis performed using non-linear lumped mass models. Consequently different fragility curves are built for identifying the most important damage states and calculating the corresponding probability of occurrence. The results show how the support structure, especially when composed by RC columns, is the most influencing one, whereas the remaining damage states have a limited influence.

show abstract

Section: Fragility Assessment Methodsmentioning

confidence: 99%

Seismic Fragility Analysis of Steel Storage Tanks

Paolacci¹,

Phan²,

Corritore³

et al. 2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

View full text Add to dashboard Cite

show abstract

“…The quasi-static test displayed a progressive failure of the porcelain-steel flange joint at bottom section of S 2 , Figure 7a. This occurs mainly in elements where the porcelain-flange joint is made with a low-strength mortar (Go¨kc xe et al, 2018;Paolacci et al, 2014). On the contrary, Figure 7b shows the fragile failure occurring at the base section of S 3 due to a premature failure of the porcelain than the other components.…”

Section: Quasi-static Test Of the 550 Kv Post Insulatormentioning

confidence: 99%

Improvement of the polyurethane spring isolation device for HV post insulators and its evaluation by fragility curves

2021

View full text Add to dashboard Cite

A novel seismic base isolation system has been developed for high-voltage (HV) porcelain post insulators. The seismic isolation device consists of two steel plates, four polyurethane springs, and a steel rod, which are low-cost components compared to the post insulators. Two alternative designs of the device are experimentally and numerically assessed in this article. A simple and robust numerical model consisting of linear line elements and nonlinear springs was generated, and subsequently validated using the experimental results. Incremental dynamic analyses (IDAs) were then performed to obtain fragility curves. Ten historical earthquake profiles, scaled to intensities between 0.1 and 2.0 g, were then applied to the numerical models. The fragility curves, generated according to the latest version of IEEE-693, demonstrate that the seismic isolation devices are highly effective in diminishing the base moment of the porcelain insulator. It should be noted that relatively large displacements at the top of the pole must be accounted for by ensuring adequate slackness in the flexible conductors.

show abstract

“…It is common to adopt FE modeling method in seismic analysis for porcelain post electrical equipment, such as in [13][14][15], while simplified modeling methods are also adopted in research on electrical equipment in substations. In [16,17], generalized single degree of freedom system was used to model a post type of electrical equipment.…”

Section: Introductionmentioning

confidence: 99%

Multibody Modeling Method for UHV Porcelain Arresters Equipped with Lead Alloy Isolation Device

Hou

Zhu

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

This paper presents a multibody modeling method for seismic analysis of UHV porcelain surge arresters equipped with a kind of seismic isolation device. An UHV arrester is modeled as a planar multibody system whose number of DOF is equal to the number of the arrester units. Joint coordinate method is adopted to construct the governing equations of motion. The seismic isolation device utilizing a number of lead alloy dampers as its core energy dissipation components is also investigated. An analytical model of this device is given by modeling each lead alloy damper as a hysteretic spring and reducing the entire device to a planar system consisting of a range of hysteretic springs. Its mechanical characteristic is derived theoretically, and the obtained moment-angle relationship is expressed as a system of differential algebraic equations. The initial rotational stiffness of the device is formulated in terms of the structural and mechanical parameters of the device. This analytic expression is used in estimating the fundamental frequency of the isolated equipment. By this modeling method, it is easy to construct the governing equations of motion for the isolated system. An UHV arrester specimen is analyzed by this proposed method. The effectiveness of the isolation device in terms of reducing the internal base moment is significant and the influence of system parameters on the effectiveness is also discussed. The proposed method shows its potential usefulness in optimal design of the isolation device.

show abstract

Seismic vulnerability assessment of a high voltage disconnect switch

Cited by 36 publications

References 11 publications

Seismic Fragility Analysis of Steel Storage Tanks

Seismic Fragility Analysis of Steel Storage Tanks

Improvement of the polyurethane spring isolation device for HV post insulators and its evaluation by fragility curves

Multibody Modeling Method for UHV Porcelain Arresters Equipped with Lead Alloy Isolation Device

Contact Info

Product

Resources

About