TORSIONAL RESPONSE IN BUILDINGS EXPOSED TO GROUND MOTIONS INDUCED BY VRANCEA EARTHQUAKES
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.
natural torsion accidental torsion rotational components.
R. Enache S. Demetriu E. Albota
Dept. of Theoretical Mechanics, Statics and Dynamics of Structures, Technical University of Civil Engineering Bucharest, Romania
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）