Fundamental Vibration Period of SW Buildings

Abstract This paper focuses on the fundamental period vibration evaluation of civil engineering constructions achieved in reinforced concrete which use the shear walls bracing system. As known, in the vibration modes assessment phase of a given structure, much of the seismic energy is absorbed by the fundamental mode. For this reason, many authors have provided empirical formulas using many approaches. Based on an elastic behavior and the Dunkerley formula, a simplified expression is proposed, which takes into account the geometrical and the mechanical characteristics of the structure. Following this development, the period value is a function of the number of floors of the considered structure. It is in good agreement with that obtained by the FEM that uses numerical methods requiring a sophisticated and more complex process. It may constitute a practical tool for practicing engineers in the preliminary design phase of any SW building.