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Wind and Structures
  Volume 32, Number 4, April 2021 , pages 355-369
DOI: https://doi.org/10.12989/was.2021.32.4.355
 


Multi-objective shape optimization of tall buildings considering profitability and multidirectional wind-induced accelerations using CFD, surrogates, and the reduced basis approach
Miguel Cid Montoya, Felix Nieto and Santiago Hernandez

 
Abstract
    Shape optimization of tall buildings is an efficient approach to mitigate wind-induced effects. Several studies have demonstrated the potential of shape modifications to improve the building's aerodynamic properties. On the other hand, it is well-known that the cross-section geometry has a direct impact in the floor area availability and subsequently in the building's profitability. Hence, it is of interest for the designers to find the balance between these two design criteria that may require contradictory design strategies. This study proposes a surrogate-based multi-objective optimization framework to tackle this design problem. Closed-form equations provided by the Eurocode are used to obtain the wind-induced responses for several wind directions, seeking to develop an industry-oriented approach. CFD-based surrogates emulate the aerodynamic response of the building cross-section, using as input parameters the cross-section geometry and the wind angle of attack. The definition of the building's modified plan shapes is done adopting the reduced basis approach, advancing the current strategies currently adopted in aerodynamic optimization of civil engineering structures. The multi-objective optimization problem is solved with both the classical weighted Sum Method and the Weighted Min-Max approach, which enables obtaining the complete Pareto front in both convex and non-convex regions. Two application examples are presented in this study to demonstrate the feasibility of the proposed strategy, which permits the identification of Pareto optima from which the designer can choose the most adequate design balancing profitability and occupant comfort.
 
Key Words
    along-wind accelerations; codes; CFD; surrogate modeling; profitability; tall buildings; reduced basis design; aerodynamic optimization
 
Address
Miguel Cid Montoya:Structural Mechanics Group, School of Civil Engineering, University of La Coruna, 15071, La Coruna, Spain

Felix Nieto:Structural Mechanics Group, School of Civil Engineering, University of La Coruna, 15071, La Coruna, Spain

Santiago Hernandez:Structural Mechanics Group, School of Civil Engineering, University of La Coruna, 15071, La Coruna, Spain
 

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