University of Tasmania
Browse

File(s) not publicly available

A deterministic-stochastic hybrid model of downbursts and its impact on a cantilevered structure

journal contribution
posted on 2023-05-16, 19:59 authored by Chen, L, Letchford, CW
Thunderstorm downbursts, which are sources of extreme wind loadings in nature, have caused numerous structural failures around the world. It is essential to build some applicable, though approximate, model for these loadings under which structures can be assessed. In this paper, a deterministic-stochastic hybrid model of downbursts is presented. In this model, downburst winds are the summation of a deterministic mean and a stochastic fluctuation. Wood's velocity profile for the vertical profile and Holmes' empirical model for the time function are utilized to model the mean wind. The fluctuation is modeled as a uniformly modulated evolutionary vector stochastic process. Time histories of downburst wind speeds over slender structures, such as tall buildings, can be simulated by the spectral representation method. Using the simulated downbursts as input, the dynamic responses of structures are obtained in the time domain. As a numerical example, the dynamic response of a cantilevered structure to simulated downbursts is computed and their sensitivity to the coherence function is discussed. © 2003 Elsevier Ltd. All rights reserved.

History

Publication title

Engineering Structures

Volume

26

Issue

5

Pagination

619-629

ISSN

0141-0296

Department/School

School of Engineering

Publisher

Pergamon

Place of publication

UK

Repository Status

  • Restricted

Socio-economic Objectives

Civil construction planning

Usage metrics

    University Of Tasmania

    Categories

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC