Reliability assessment of the South African wind load design formulation
Date
2018-09
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
South African Institution of Civil Engineering
Abstract
ENGLISH ABSTRACT: The representation of the strong wind climate and the reliability calibration of wind loading
are the main components of the provisions for local conditions in the South African wind
load standard. The reliability implications of new probability models for wind load and an
updated map of the characteristic wind speed are assessed in this paper. Wind load probability
distributions are based on a combination of new models for free-field wind pressure, pressure
coefficients and terrain factors with existing information. The results from both assessments
show that the wind load partial factor of 1.3 does not result in adequate reliability performance
for typical design situations. A partial factor of 1.6 is recommended. Where an increased partial
factor for wind loading will result in a corresponding increase in the design wind load, the
introduction of an updated map of the characteristic wind speed for South Africa is shown to
result in an overall reduction of wind load. Regional analysis, however, indicates that there are
regions in the Western and Eastern Cape that will have increased design wind loads. Combined
with an updated partial factor of 1.6, the aggregate increase in design wind loads across South
Africa is shown to be 11%.
Description
CITATION: Botha, J., Retief, J. V. & Viljoen, C. 2018. Reliability assessment of the South African wind load design formulation. Journal of the South African Institution of Civil Engineering, 60(3):30-40, doi:10.17159/2309-8775/2018/v60n3a3.
The original publication is available at http://www.scielo.org.za
The original publication is available at http://www.scielo.org.za
Keywords
Wind loading code, Wind-pressure, Reliability (Engineering)
Citation
Botha, J., Retief, J. V. & Viljoen, C. 2018. Reliability assessment of the South African wind load design formulation. Journal of the South African Institution of Civil Engineering, 60(3):30-40, doi:10.17159/2309-8775/2018/v60n3a3