Simultaneous optimization of structural shape and control system of large-scale space frame based on sine wave inputs

Research output: Contribution to journalArticle

Abstract

This paper proposes a simultaneous optimal design method of asymmetric large-scale space frames with tuned mass dampers (TMDs). The objective function is defined by the maximum absolute acceleration response of the structure to input ground motions of sine waves. Sine waves of periods with the five natural periods having large modal participation factors of the structure are input, and the maximum responses are calculated by time-history response analysis to evaluate the objective function. The shape of the space frame, i.e. nodal coordinates of the space frame's joints, is described by a Bézier surface to reduce the number of design variables. The change from the initial values of the nodal coordinates is constrained to preserve the initial design shape, which is provided by an architect. The method employs a genetic algorithm in optimization. In addition, a case study is conducted for an asymmetric steel space frame of a vault-like shape. The results confirm the reduction of maximum absolute acceleration responses in the optimal shapes not only to the five sine waves but also to four scaled ground motion records. Moreover, the presence of TMDs enables the reduction of the peak response value and maintains similarity to the initial shape.

Original languageEnglish
Pages (from-to)164-178
Number of pages15
JournalInternational Journal of Safety and Security Engineering
Volume4
Issue number2
DOIs
Publication statusPublished - 2014

Fingerprint

control system
Control systems
ground motion
Genetic algorithms
response analysis
design method
Steel
genetic algorithm
steel
history
Optimal design

Keywords

  • Architectural design
  • Bézier surface
  • Eearthquake engineering
  • Genetic algorithm
  • Optimization
  • Seismic control
  • Space frame
  • Structural engineering
  • Structural shape
  • Tuned mass damper

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Environmental Science(all)

Cite this

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title = "Simultaneous optimization of structural shape and control system of large-scale space frame based on sine wave inputs",
abstract = "This paper proposes a simultaneous optimal design method of asymmetric large-scale space frames with tuned mass dampers (TMDs). The objective function is defined by the maximum absolute acceleration response of the structure to input ground motions of sine waves. Sine waves of periods with the five natural periods having large modal participation factors of the structure are input, and the maximum responses are calculated by time-history response analysis to evaluate the objective function. The shape of the space frame, i.e. nodal coordinates of the space frame's joints, is described by a B{\'e}zier surface to reduce the number of design variables. The change from the initial values of the nodal coordinates is constrained to preserve the initial design shape, which is provided by an architect. The method employs a genetic algorithm in optimization. In addition, a case study is conducted for an asymmetric steel space frame of a vault-like shape. The results confirm the reduction of maximum absolute acceleration responses in the optimal shapes not only to the five sine waves but also to four scaled ground motion records. Moreover, the presence of TMDs enables the reduction of the peak response value and maintains similarity to the initial shape.",
keywords = "Architectural design, B{\'e}zier surface, Eearthquake engineering, Genetic algorithm, Optimization, Seismic control, Space frame, Structural engineering, Structural shape, Tuned mass damper",
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AB - This paper proposes a simultaneous optimal design method of asymmetric large-scale space frames with tuned mass dampers (TMDs). The objective function is defined by the maximum absolute acceleration response of the structure to input ground motions of sine waves. Sine waves of periods with the five natural periods having large modal participation factors of the structure are input, and the maximum responses are calculated by time-history response analysis to evaluate the objective function. The shape of the space frame, i.e. nodal coordinates of the space frame's joints, is described by a Bézier surface to reduce the number of design variables. The change from the initial values of the nodal coordinates is constrained to preserve the initial design shape, which is provided by an architect. The method employs a genetic algorithm in optimization. In addition, a case study is conducted for an asymmetric steel space frame of a vault-like shape. The results confirm the reduction of maximum absolute acceleration responses in the optimal shapes not only to the five sine waves but also to four scaled ground motion records. Moreover, the presence of TMDs enables the reduction of the peak response value and maintains similarity to the initial shape.

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