Torsional Response in Buildings Exposed to Ground Motions Induced by Vrancea Earthquakes

Abstract eng:
Natural torsion appears in systems with no coincidence between the mass and the stiffness centre. The dynamic response in this case couples torsion and translation on one or two orthogonal directions, depending on the existence of a symmetry axis. These systems are named torsional coupled systems. But torsion (known as accidental torsion) may occur even in symmetrical systems due to several reasons, as rotational components of the ground motion or uncertainties in stiffness or mass distribution. In this paper is analysed the seismic response of non-symmetrical systems (relative to both axes) acted simultaneously by the registered translational and the computed rotational components of the ground motion during several important Vrancea earthquakes (1977, 1986 and 1990). There are outlined the influence of the eccentricities and of the rotational component on the torsional response. Torsional response spectra are drawn for different site conditions.

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