Structural Engineering and Mechanics

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Ductility-based seismic design of precast concrete large panel buildings

  • Astarlioglu, Serdar (Department of Civil and Environmental Engineering, The Pennsylvania State University) ;
  • Memari, Ali M. (Department of Architectural Engineering, The Pennsylvania State University) ;
  • Scanlon, Andrew (Department of Civil and Environmental Engineering, The Pennsylvania State University)
  • Published : 2000.10.25
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Abstract

Two approximate methods based on mechanism analysis suitable for seismic assessment/design of structural concrete are reviewed. The methods involve use of equal energy concept or equal displacement concept along with appropriate patterns of inelastic deformations to relate structure's maximum lateral displacement to member and plastic deformations. One of these methods (Clough's method), defined here as a ductility-based approach, is examined in detail and a modification for its improvement is suggested. The modification is based on estimation of maximum inelastic displacement using inelastic design response spectra (IDRS) as an alternative to using equal energy concept. The IDRS for demand displacement ductilities are developed for a single degree of freedom model subjected to several accelerograms as functions of response modification factor (R), damping ratios, and strain hardening. The suggested revised methodology involves estimation of R as the ratio of elastic strength demand to code level demand, and determination of design base shear using $R_{design}{\leq}R$ and maximum displacement, determination of plastic displacement using IDRS and subsequent local plastic deformations. The methodology is demonstrated for the case of a 10-story precast wall panel building.

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References

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