A two‐stage structural optimization‐based design procedure of structural systems

Abstract

Summary In this work, a combined ground structure topology–sizing optimization‐based methodology is presented, for supporting the design phases of moment‐resisting braced frames (MRBFs) for tall buildings, from the conceptual design phase to the final one. The mathematical problem is formulated as a minimum material volume problem subject to compliance and design check constraints imposed by the serviceability and ultimate limit states of the Eurocode design provisions, while the optimized designs achieved are composed of standardized section properties of the Euronorm. Most of the studies that rely on ground structure topology optimization formulation are limited to truss structures, while compliance is used as the objective to be minimized. Considering structural systems composed of elements that develop both axial and flexural stress, together with topology optimization problem formulation where the material volume is to be minimized, describe the major challenges of this study. The minimum material volume problem initially is dealt with by a frame structural topology optimization (FSTO) approach representing the conceptual design phase followed by a sizing structural design optimization procedure referring to the final design phase. In order to test the efficiency of the methodology, it is implemented for designing the structural system of MRBFs for mid‐ and high‐rise building structures. For the case of the real‐world structural systems examined, a variant of the methodology is used where its second design phase is implemented by means of the optimization computing platform (OCP) integrated with the commercial software ETABS v18.

A multi‐objective structural optimization method for serviceability design of tall buildings

“…For example, they may result in unacceptable additional costs, such as optimizing the external shape 1–4 and installing vibration mitigation devices 5 . In contrast, structural optimization, which includes size and topology optimization, 6 is an effective method to improve a structure's performance in the serviceability design phase and economic benefits, especially for tall and complex buildings that are sensitive to seismic and wind excitation due to their high flexibility and complex structural system. Structural optimization based on element resizing, which allows for least‐cost structures for buildings subject to various constraints, is often the most recommended optimization method to ensure that the structure meets different serviceability design objectives according to the requirements of structural engineers.…”