Optimized Seismic Design of Passively Damped Outriggers Considering Perimeter Column Flexibility
Publication: Journal of Structural Engineering
Volume 146, Issue 12
Abstract
This paper presents a formal optimization methodology for the damped outrigger problem under stochastic seismic excitations. An efficient analytical model is developed utilizing a Maxwell model connection between the core and the columns reducing the computational effort. A novel damping distribution function (DDF), representing the damped outriggers, is introduced in order to decrease the number of design variables significantly, reducing computational cost as well. The root mean square responses are obtained according to Lyapunov’s equation. Accounting for several different responses as design criteria is done by formulating a single aggregated constraint in an efficient manner. The adjoint analytical method is adopted to execute the gradient-based optimization. Finally, demonstrating usage of the optimization methodology is shown for an example of a 50-story building with different perimeter column sizes. It is shown that the flexibility of the perimeter columns and outriggers have a large influence on the behavior of the structure and the optimized solutions, reaffirming the importance of an optimization methodology for the damped outrigger.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (matrices of the structural model of the presented example).
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Published In
Journal of Structural Engineering
Volume 146 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Aug 6, 2019
Accepted: Jun 11, 2020
Published online: Sep 16, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 16, 2021
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