Optimized seismic design of passively damped outriggers considering perimeter column flexibility

Itamar Netzer, Oren Lavan

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number04020254
JournalJournal of Structural Engineering (United States)
Issue number12
StatePublished - 1 Dec 2020


  • Damped outrigger
  • Damping distribution function
  • Maxwell model
  • Optimized design
  • Seismic design
  • Seismic retrofit
  • Tall buildings
  • Viscous dampers

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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