Structural Engineering and Mechanics

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Seismic behavior enhancement of frame structure considering parameter sensitivity of self-centering braces

  • Xu, Longhe (School of Civil Engineering, Beijing Jiaotong University) ;
  • Xie, Xingsi (School of Civil Engineering, Beijing Jiaotong University) ;
  • Yan, Xintong (School of Civil Engineering, Beijing Jiaotong University) ;
  • Li, Zhongxian (Key Laboratory of Coast Civil Structure Safety of China Ministry of Education, Tianjin University)
  • Received : 2018.12.08
  • Accepted : 2019.03.20
  • Published : 2019.07.10
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Abstract

A modified mechanical model of pre-pressed spring self-centering energy dissipation (PS-SCED) brace is proposed, and the hysteresis band is distinguished by the indication of relevant state variables. The MDOF frame system equipped with the braces is formulated in an incremental form of linear acceleration method. A multi-objective genetic algorithm (GA) based brace parameter optimization method is developed to obtain an optimal solution from the primary design scheme. Parameter sensitivities derived by the direct differentiation method are used to modify the change rate of parameters in the GA operator. A case study is conducted on a steel braced frame to illustrate the effect of brace parameters on node displacements, and validate the feasibility of the modified mechanical model. The optimization results and computational process information are compared among three cases of different strategies of parameter change as well. The accuracy is also verified by the calculation results of finite element model. This work can help the applications of PS-SCED brace optimization related to parameter sensitivity, and fulfill the systematic design procedure of PS-SCED brace-structure system with completed and prospective consequences.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Beijing Natural Science Foundation of China

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