Smart Structures and Systems

  • 제21권4호
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  • Pages.479-491
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  • 2018
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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Seismic behavior of properly designed CBFs equipped with NiTi SMA braces

  • Qiu, Canxing (School of civil engineering, Shandong University) ;
  • Zhang, Yichen (School of civil engineering, Shandong University) ;
  • Qi, Jian (School of civil engineering, Shandong University) ;
  • Li, Han (School of civil engineering, Shandong University)
  • 투고 : 2017.12.30
  • 심사 : 2018.02.28
  • 발행 : 2018.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

Shape memory alloys (SMA) exhibit superelasticity which refers to the capability of entirely recovering large deformation upon removal of applied forces and dissipating input energy during the cyclic loading reversals when the environment is above the austenite finish temperature. This property is increasingly favored by the earthquake engineering community, which is currently developing resilient structures with prompt recovery and affordable repair cost after earthquakes. Compared with the other SMAs, NiTi SMAs are widely deemed as the most promising candidate in earthquake engineering. This paper contributes to evaluate the seismic performance of properly designed concentrically braced frames (CBFs) equipped with NiTi SMA braces under earthquake ground motions corresponding to frequently-occurred, design-basis and maximum-considered earthquakes. An ad hoc seismic design approach that was previously developed for structures with idealized SMAs was introduced to size the building members, by explicitly considering the strain hardening characteristics of NiTi SMA particularly. The design procedure was conducted to compliant with a suite of ground motions associated with the hazard level of design-basis earthquake. A total of four six-story CBFs were designed by setting different ductility demands for SMA braces while designating with a same interstory drift target for the structural systems. The analytical results show that all the designed frames successfully met the prescribed seismic performance objectives, including targeted maximum interstory drift, uniform deformation demand over building height, eliminated residual deformation, controlled floor acceleration, and slight damage in the main frame. In addition, this study indicates that the strain hardening behavior does not necessarily impose undesirable impact on the global seismic performance of CBFs with SMA braces.

키워드

과제정보

연구 과제 주관 기관 : China Postdoctoral Science Foundation, Natural Science Foundation of Shandong Province, Shandong University

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