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Parameters affecting the fundamental period of infilled RC frame structures

  • Asteris, Panagiotis G. (Computational Mechanics Laboratory, School of Pedagogical and Technological Education) ;
  • Repapis, Constantinos C. (Department of Civil Engineering, Piraeus University of Applied Sciences) ;
  • Tsaris, Athanasios K. (Computational Mechanics Laboratory, School of Pedagogical and Technological Education) ;
  • Di Trapani, Fabio (Department of Civil, Environmental, Aerospace and Materials Engineering (DICAM), University of Palermo) ;
  • Cavaleri, Liborio (Department of Civil, Environmental, Aerospace and Materials Engineering (DICAM), University of Palermo)
  • Received : 2015.06.08
  • Accepted : 2015.07.31
  • Published : 2015.11.25

Abstract

Despite the fact that the fundamental period appears to be one of the most critical parameters for the seismic design of structures according to the modal superposition method, the so far available in the literature proposals for its estimation are often conflicting with each other making their use uncertain. Furthermore, the majority of these proposals do not take into account the presence of infills walls into the structure despite the fact that infill walls increase the stiffness and mass of structure leading to significant changes in the fundamental period numerical value. Toward this end, this paper presents a detailed and indepth analytical investigation on the parameters that affect the fundamental period of reinforce concrete structure. The calculated values of the fundamental period are compared against those obtained from the seismic code and equations proposed by various researchers in the literature. From the analysis of the results it has been found that the number of storeys, the span length, the stiffness of the infill wall panels, the location of the soft storeys and the soil type are crucial parameters that influence the fundamental period of RC buildings.

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