<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The cubic translation model is a well know tool in wind engineering, which provides a mathematical description of a non-Gaussian pressure as a cubic transformation of a Gaussian process. This simple model is widely used in practice since it offers a direct evaluation of the peak factors as a function of the statistics of the wind pressure data. This transformation is rather versatile but limited to processes which are said to be in the monotonic region. For processes falling outside this domain, this paper describes an alternative which is based on the physics of the wind flow. First, it is shown, with a classical example of a flow involving corner vortices on a flat roof, that the pressure data which does not meet the monotonic criterion is in fact associated with a bimodal distribution. Then, the proposed approach is to decompose this data into the two governing modes (slow background turbulence and fast corner vortices) and apply the usual translation model to each of them.</p></abstract>

The cubic translation model is a well know tool in wind engineering, which provides a mathematical description of a non-Gaussian pressure as a cubic transformation of a Gaussian process. This simple model is widely used in practice since it offers a direct evaluation of the peak factors as a function of the statistics of the wind pressure data. This transformation is rather versatile but limited to processes which are said to be in the monotonic region. For processes falling outside this domain, this paper describes an alternative which is based on the physics of the wind flow. First, it is shown, with a classical example of a flow involving corner vortices on a flat roof, that the pressure data which does not meet the monotonic criterion is in fact associated with a bimodal distribution. Then, the proposed approach is to decompose this data into the two governing modes (slow background turbulence and fast corner vortices) and apply the usual translation model to each of them.

On the Use of the Cubic Translation to Model Bimodal Wind Pressures

F. R. S.-FNRS, National Fund for Scientific Research

Modelling in Civil Environmental Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"On the Use of the Cubic Translation to Model Bimodal Wind Pressures"}

The cubic translation model is a well know tool in wind engineering, which provides a mathematical description of a non-Gaussian pressure as a cubic...

On the Use of the Cubic Translation to Model Bimodal Wind Pressures

Publié en ligne: 02 août 2019

Pages: 20 - 32

DOI: https://doi.org/10.2478/mmce-2019-0006

Mots clés
peak factor, non Gaussianity, wind tunnel tests, low-rise building, monotone criterion

© 2019 François Rigo et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

On the Use of the Cubic Translation to Model Bimodal Wind Pressures

Publié en ligne: 02 août 2019

Pages: 20 - 32

DOI: https://doi.org/10.2478/mmce-2019-0006

Mots cléspeak factor, non Gaussianity, wind tunnel tests, low-rise building, monotone criterion

© 2019 François Rigo et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Mots clés
peak factor, non Gaussianity, wind tunnel tests, low-rise building, monotone criterion