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Optimal Seismic Design of Asymmetrical-plan Steel Buildings with Composite Castellated Floor Systems

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Abstract

A cost optimization methodology for the main constituents of multistory asymmetrical-plan steel buildings comprising of composite castellated floor systems and 3-D steel moment-resisting frames with considering their structural interaction is proposed in this paper. The seismic performance of asymmetrical-plan steel buildings is prone to stress concentration, torsion, and coupled lateral-torsional effects. It is possible that altering the mass distribution of the asymmetrical-plan buildings by increasing the cost of floor solutions results in fitter stiffness properties with a lower cost such that the total cost of the building is reduced. To examine, the validity of this proposition the optimization method performs in two phases. In the first phase, a fine-tuned vibrating particle system algorithm optimally designs individual composite castellated floor systems of asymmetrical-plan steel buildings and provides a required search space. In the second phase, the ant colony system (ACS) algorithm with ASrank strategy explores the resulting search space to determine the optimal distribution of the floor solutions in the floor bays of the building, which in conjunction with its equivalent framing design, leads to the optimal resultant solution. An ant memory mechanism is incorporated into the formulation of the ACS algorithm to reduce the computational cost. A new graph-based procedure for mapping arbitrary structural topology into the MTSP network is introduced. The unifying of the two-phase functions of the method facilitates the controlling of the principal beam-girder vibrational mode of the floor systems. The solutions of two examples demonstrate that the programmed optimization method could efficiently optimize the floor systems and 3-D frames of asymmetrical steel buildings by examining their interaction. The distribution of least-cost floor solutions proved to be the optimal floor distribution. In many intermediate solutions, increasing the cost of the floor solutions results in a reduction in the total cost of the asymmetrical-plan steel buildings.

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Authors and Affiliations

  1. School of Civil Engineering, Iran University of Science and Technology, P.O. Box, 16846-13114, Narmak, Tehran, Iran

    Ali Kaveh & Amir Fakoor

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  1. Ali Kaveh
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  2. Amir Fakoor
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Correspondence to Ali Kaveh.

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Kaveh, A., Fakoor, A. Optimal Seismic Design of Asymmetrical-plan Steel Buildings with Composite Castellated Floor Systems. Iran J Sci Technol Trans Civ Eng 46, 1969–1995 (2022). https://doi.org/10.1007/s40996-021-00806-5

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  • DOI: https://doi.org/10.1007/s40996-021-00806-5

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