Hybrid simulation of thunderstorm outflows and wind-excited response of structures

Solari, Giovanni; Rainisio, Davide; Gaetano, Patrizia De

doi:10.1007/s11012-017-0718-x

Cited by 35 publications

(37 citation statements)

References 64 publications

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“…The equivalent static force is the product of the peak wind loading by a non-dimensional quantity, the equivalent response spectrum, depending on the first frequency, on the damping ratio and on a size factor. To check and refine the thunderstorm response spectrum technique, time domain analyses were carried out based on a novel hybrid simulation strategy (Solari et al, 2017) that captures the inherent properties of the thunderstorm outflows through simple physical concepts and real velocity records. It consists in assembling the different component signals that make up the wind velocity model, taking into account their sources of randomness.…”

Section: Wind Loading and Response Of Structuresmentioning

confidence: 99%

Mixed Climatology, Non-synoptic Phenomena and Downburst Wind Loading of Structures

Solari

2019

Lecture Notes in Civil Engineering

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In 1961 Davenport published a paper, considered by most the constitutive deed of Wind Engineering, where meteorology, micrometeorology, climatology, aerodynamics and structural dynamics were embedded into a homogeneous framework of the wind loading of structures. This scheme, known as the "Davenport chain" and referred to a synoptic-scale extra-tropical cyclone is so limpid and elegant as to become a sort of axiom. Between 1976 and 1978 Gomes and Vickery separated thunderstorm from non-thunderstorm winds, determined their extreme distributions and derived a mixed statistical model later extended to other phenomena; this study, a milestone in the emerging issue of mixed climatology, proved the impossibility of labelling a heterogeneous range of phenomena characterized by different velocity fields, frequencies, durations and extensions by the generic term "wind". Many of these phenomena occur in limited and well-known areas. Extra-tropical cyclones and thunderstorms affect the entire planet. This paper provides a state-of-the-art of this subject, with particular regard to the studies conducted at the University of Genova on thunderstorms.

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Section: Wind Loading and Response Of Structuresmentioning

confidence: 99%

Mixed Climatology, Non-synoptic Phenomena and Downburst Wind Loading of Structures

Solari

2019

Lecture Notes in Civil Engineering

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“…The wind monitoring network realized for the European Projects "Wind and Ports" and "Wind, Ports and Sea" is an inexhaustible source of measurements that highlight the speed and frequency of transient events, likely of convective nature, often disregarded, especially in the past, from classical wind engineering. It is now recognized that they are crucial with respect to hazard assessments aimed at the safety of construction, infrastructure, and territory, but they are often still undistinguished from extra-tropical cyclones in most cataloguing procedures (Stucki et al, 2014).…”

Section: Weather Analysis Of the 10-hour Event On 21mentioning

confidence: 99%

“…According to this criterion, an extensive set of records labelled as thunderstorms has been gathered and subjected to probabilistic signal analyses aiming at evaluating their main properties relevant to the wind loading of structures (Solari et al, 2015a;Zhang et al, 2018). These properties have formed the base on which two novel methods have been proposed to determine the structural response to thunderstorm outflows (Solari et al, 2015b(Solari et al, , 2017Solari, 2016).…”

Section: Introductionmentioning

confidence: 99%

Monitoring, cataloguing, and weather scenarios of thunderstorm outflows in the northern Mediterranean

Burlando

Shi

Solari

2018

Nat. Hazards Earth Syst. Sci.

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Abstract. High sampling rate (10 Hz) anemometric measurements of the Wind, Ports, and Sea monitoring network in the northern Tyrrhenian Sea have been analysed to extract the thunderstorm-related signals and catalogue them into three families according to the different time-scale of each event, subdivided among 10 min, 1, and 10 h events. Their characteristics in terms of direction of motion and seasonality/daily occurrence have been analysed: the results showed that most of the selected events come from the sea and occur from 12:00 to 00:00 UTC during the winter season. In terms of peak wind speed, the strongest events all belonged to the 10 min family, but no systematic correlation was found between event duration and peaks.Three events, each one representative of the corresponding class of duration, have been analysed from the meteorological point of view, in order to investigate their physical nature. According to this analysis, which was mainly based on satellite images, meteorological fields obtained from GFS analyses related to convection in the atmosphere, and lightning activity, the thunderstorm-related nature of the 10 min and 1 h events was confirmed. The 10 h event turned out to be a synoptic event, related to extra-tropical cyclone activity.

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“…Researchers studying the effect of downbursts on transmission line systems have followed different paths in choosing the wind field used to examine the behavior of different transmission line components corresponding to downburst loading cases. Despite the availability of different numerical approaches to generate thunderstorm outflows (Ponte and Riera, 2007;Solari et al, 2017), many researchers used wind fields developed using computational fluid dynamics (CFD). Shehata et al (2005) scaled up the wind field resulting from the CFD simulation conducted by Kim and Hangan (2007) to study the behavior of both the conductors and the supporting towers due to the applied downburst wind field.…”

Section: Introduction Backgroundmentioning

confidence: 99%

The Dynamic Effect of Downburst Winds on the Longitudinal Forces Applied to Transmission Towers

Ibrahim

Damatty

Elawady

2019

Front. Built Environ.

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Electric power transmission line systems are a key component in the development of our modern societies. The uninterrupted availability of electric power mandates building transmission line structures that can withstand severe natural hazards. The current study focuses on the performance of conductor line systems subjected to downburst loading, which along with other types of wind events are responsible for 80% of weather related failures of transmission lines. Due to the special configuration of downburst wind fields, a unique failure mode of transmission line structures can be found to damage the cross-arms of the supporting towers as a result of the development of longitudinal forces in the conductor lines. The main concern of the current study is to explore the dynamic effect of downburst loading on these longitudinal forces, and to examine the validity of using quasi-static analysis. This is done through two levels of analysis, model-scale and full-scale. The model-scale analysis is first used to propose a simulation technique that can predict the dynamic response of conductor systems due to downburst loading overcoming the complexity induced by time varying aerodynamic damping coefficients. The proposed model is validated using a unique experiment conducted at WindEEE dome testing facility at The University of Western Ontario in Canada. The validated model is used to conduct analysis at the full-scale level using a wind field generated by a Computational Fluid Dynamics (CFD) model. Results show that the longitudinal forces within the conductor system are dynamically insensitive and can therefore be treated quasi-statically. Lastly, to judge the applicability of the wind field used, a comparison was made between the CFD wind field and full-scale records. The comparison was done through two parameters that would affect the quasi-static response; the first relating the peak velocity to the post peak velocity, and the second defining the ramping period. It was concluded from the comparison that varying the defined parameters would result in a maximum difference of 5% in the computed reactions.

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Hybrid simulation of thunderstorm outflows and wind-excited response of structures

Cited by 35 publications

References 64 publications

Mixed Climatology, Non-synoptic Phenomena and Downburst Wind Loading of Structures

Mixed Climatology, Non-synoptic Phenomena and Downburst Wind Loading of Structures

Monitoring, cataloguing, and weather scenarios of thunderstorm outflows in the northern Mediterranean

The Dynamic Effect of Downburst Winds on the Longitudinal Forces Applied to Transmission Towers

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