The Earthquake Engineering Online Archive

Inelastic torsional response of structures subjected to earthquake ground motions

Yamazaki, Yutaka

UCB/EERC-80/07, Earthquake Engineering Research Center, University of California, Berkeley, 1980-04, 162 pages (530/Y28/1980)

The objectives of this paper are to (1) identify the basic parameters which control the earthquake response of torsionally coupled systems composed of resisting elements providing force interaction during yielding; (2) clarify differences in response between systems subjected to single-component ground motion and systems subjected to double-component ground motion; (3) clarify differences in response among an elastic system, an elastoplastic system without force interaction, and an elastoplastic system with force interaction; and (4) evaluate the effects of magnitude of eccentricity and magnitudes of yield shear forces on the response of elastoplastic systems with force interaction. A single-story structure with a rectangular deck and four resisting elements was used to examine these objectives. First, dimensionless equations of motion were formulated containing the basic parameters which control earthquake response; and, then, parametric studies were carried out to determine the effects of such parameters on elastoplastic coupled translational-torsional response.

Available online: http://nisee.berkeley.edu/documents/EERC/EERC-80-07.pdf (4 MB)