Earthquakes and Structures

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A design procedure of dissipative braces for seismic upgrading structures

  • Bergami, A.V. (University of Roma Tre, Department of Structures) ;
  • Nuti, C. (University of Roma Tre, Department of Structures)
  • Received : 2011.02.22
  • Accepted : 2012.04.12
  • Published : 2013.01.25
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Abstract

The research presented in this paper deals with the seismic protection of existing frame structures by means of passive energy dissipation. A displacement-based procedure to design dissipative bracings for the seismic protection of frame structures is proposed and some applications are discussed. The procedure is based on the displacement based design using the capacity spectrum method, no dynamic non linear analyses are needed. Two performance objective have been considered developing the procedure: protect the structure against structural damage or collapse and avoid non-structural damage as well as excessive base shear. The compliance is obtained dimensioning dissipative braces to limit global displacements and interstorey drifts. Reference is made to BRB braces, but the procedure can easily be extended to any typology of dissipative brace. The procedure has been validated through a comparison with nonlinear dynamic response of two 2D r.c. frames, one bare and one infilled. Finally a real application, on an existing 3D building where dissipative braces available on market are used, is discussed.

Keywords

References

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