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Title: Modelling and simulation aspects of performance-based wind engineering of tall buildings
Author: Clannachan, Gordon Henry
ISNI:       0000 0004 2740 4320
Awarding Body: University of Strathclyde
Current Institution: University of Strathclyde
Date of Award: 2012
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The study is concerned with developing an adequate Performance-Based Wind Engineering (PBWE) framework for tall building design. The focus is to introduce advanced modelling and simulation techniques to improve key analysis stages, namely by using Computational Fluid Dynamics (CFD) and Computational Structural Mechanics (CSM). The clearly defined five stage PBWE framework is realised and implemented using both existing and newly developed simulation components. The performance of the developed process is explored by comparative PBWE analyses to assess the wind-induced behaviour of two tall building designs with distinctly different cross sections; a regular rectangular cross section and an irregular „L‟-shaped cross section. The performance of CFD was primarily dependent on the turbulence model. On the basis of an extensive validation study, the Reynolds-Averaged Navier-Stokes (RANS) model was able to adequately compute the mean pressure coefficients acting on the benchmark CAARC tall building. However, its inability to sustain the atmospheric turbulence resulted in a significant under-estimation of the top floor accelerations. Hence, it was concluded that the RANS model is not suitable for competent PBWE studies. The results showed that the Large Eddy Simulation (LES) model offered the closest alternative to wind tunnel testing. However, full LES was too computationally expensive to be used for the PBWE framework, and hence a hybrid RANS-LES simulation strategy was formulated as a compromise. This was considered to offer an appropriate representation of the wind-induced pressure field without prohibitive complexities emanating from a full LES model. The response of the regular tall building was compared for both the RANS and the LES computed wind loads. This identified that the atmospheric turbulence had a much greater affect on the response of a regular prismatic tall building than the structure-induced turbulence. Despite an increase in structure-induced turbulence, the results suggested that the response of an irregular L‟-shaped tall building would also be governed by atmospheric turbulence in the incident wind field.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available