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Multi-component ground motion response spectra for coupled horizontal, vertical, angular accelerations, and tilt

ISET Journal of Earthquake Technology

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Abstract

Rotational and vertical components of ground motion are almost always ignored in design or in the assessment of structures despite the fact that vertical motion can be twice as much as the horizontal motion and may exceed 2g level, and rotational excitation may reach few degrees in the proximity of fault rupture. Coupling of different components of ground excitation may significantly amplify the seismic demand by introducing additional lateral forces and enhanced P-?? effects. In this paper, a governing equation of motion is postulated to compute the response of a SDOF oscillator under a multi-component excitation. The expanded equation includes secondary P-?? components associated with the combined impacts of tilt and vertical excitations in addition to the inertial forcing terms due to the angular and translational accelerations. The elastic and inelastic spectral ordinates traditionally generated considering the uniaxial input motion are compared at the end with the multi-component response spectra of coupled horizontal, vertical and tilting motions. The proposed multi-component response spectrum reflects kinematic characteristics of the ground motion that are not identifiable by the conventional spectrum itself, at least for the near-fault region where high intensity vertical shaking and rotational excitation are likely to occur.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Multi-component ground motion response spectra for coupled horizontal, vertical, angular accelerations, and tilt
Series title:
ISET Journal of Earthquake Technology
Volume
44
Issue:
1
Year Published:
2007
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
ISET Journal of Earthquake Technology
First page:
259
Last page:
284
Number of Pages:
26