Strong-motion duration and response scaling of yielding and degrading eccentric structures
File(s)
Published version
Author(s)
Malaga Chuquitaype, Christian
Type
Journal Article
Abstract
Plan irregular structures, whose complex response represents a generalization of the simpler de-coupled motion ascribed to symmetric buildings, make up a large proportion of the failures during major earthquakes. This paper examines the seismic response scaling of degrading and no-degrading eccentric structures subjected to bi-directional earthquake action and its relationship with the duration of the ground-motion by means of dimensional and orientational analyses. Structures with reflectionally symmetric stiffness distribution and mass eccentricity subjected to orthogonal pairs of ideal pulses are considered as the fundamental case. The application of Vaschy-Buckingham’s -theorem reduces the number of variables governing the peak orthogonal displacements leading to the emergence of remarkable order in the structural response. If orientationally consistent dimensionless parameters are selected, the response becomes self-similar. By contrast, when degradation is introduced, peak inelastic displacements are dramatically affected and the self-similarity in the response is lost immediately after the onset of inelastic deformations. Conversely, if the uniform duration, instead of the period, of the strong-motion is adopted as a time-scale, a practically self-similar response is observed. This offers unequivocal proof of the fundamental role played by the ground-motion duration in defining the peak displacement response of degrading structures even at small inelastic demands, although its importance increases with increasing deformation levels. Finally, the existence of complete similarities, or similarities of the first kind, are explored and the practical implications of these findings are briefly outlined in the context of real pulse-like ground-motions with varying degrees of coherency.
Date Issued
2021-02
Date Acceptance
2020-08-27
Citation
Earthquake Engineering and Structural Dynamics, 2021, 50 (2), pp.635-654
ISSN
0098-8847
Publisher
John Wiley and Sons
Start Page
635
End Page
654
Journal / Book Title
Earthquake Engineering and Structural Dynamics
Volume
50
Issue
2
Copyright Statement
© 2020 The Authors. Earthquake Engineering & Structural Dynamics published by John Wiley & Sons Ltd.
License URL
Identifier
https://onlinelibrary.wiley.com/doi/10.1002/eqe.3350
Subjects
Science & Technology
Technology
Engineering, Civil
Engineering, Geological
Engineering
bidirectional ground motion
cyclic degradation
dimensional analysis
earthquake displacement demands
ground-motion duration
self-similarity
GROUND MOTIONS
TORSIONAL PROVISIONS
DIMENSIONAL ANALYSIS
SEISMIC BEHAVIOR
BUILDINGS
STRENGTH
RECORDS
SYSTEMS
Strategic, Defence & Security Studies
0905 Civil Engineering
Publication Status
Published
Date Publish Online
2020-09-27