Structural Engineering and Mechanics

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Fundamental period of infilled RC frame structures with vertical irregularity

  • Asteris, Panagiotis G. (Computational Mechanics Laboratory, School of Pedagogical and Technological Education) ;
  • Repapis, Constantinos C. (Department of Civil Engineering, Piraeus University of Applied Sciences) ;
  • Foskolos, Filippos (Computational Mechanics Laboratory, School of Pedagogical and Technological Education) ;
  • Fotos, Alkis (Computational Mechanics Laboratory, School of Pedagogical and Technological Education) ;
  • Tsaris, Athanasios K. (Computational Mechanics Laboratory, School of Pedagogical and Technological Education)
  • Received : 2016.09.03
  • Accepted : 2016.12.27
  • Published : 2017.03.10
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Abstract

The determination of the fundamental period of vibration of a structure is essential to earthquake design. Current codes provide formulas for the approximate estimation of the fundamental period of earthquake-resistant building systems. These formulas are dependent only on the height of the structure or number of storeys without taking into account the presence of infill walls into the structure, despite the fact that infill walls increase the stiffness and mass of the structure leading to significant changes in the fundamental period. Furthermore, such a formulation is overly conservative and unable to account for structures with geometric irregularities. In this study, which comprises the companion paper of previous published research by the authors, the effect of the vertical geometric irregularities on the fundamental periods of masonry infilled structures has been investigated, through a large set of infilled frame structure cases. Based on these results, an attempt to quantify the reduction of the fundamental period due to the vertical geometric irregularities has been made through a proposal of properly reduction factor.

Keywords

References

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