Wave-passage effects on strength-reduction factors for design of structures near earthquake faults

Wave-passage effects are described for strength-reduction factors near faults, for fault-normal and fault-parallel strong-motion displacements. It is shown that the common design rules for selection of the strength-reduction factors are usually conservative and approximately describe the reduction a...

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Bibliographic Details
Published in:Soil dynamics and earthquake engineering (1984) 2007-08, Vol.27 (8), p.703-711
Main Authors: Jalali, R.S., Trifunac, M.D., Ghodrati Amiri, G., Zahedi, M.
Format: Article
Language:English
Subjects:
Design of structures
Differential motions
Earth sciences
Earth, ocean, space
Earthquake motion
Earthquakes, seismology
Engineering and environment geology. Geothermics
Engineering geology
Exact sciences and technology
Internal geophysics
Natural hazards: prediction, damages, etc
Near field
Non-linear response
Strength-reduction factors
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Summary:Wave-passage effects are described for strength-reduction factors near faults, for fault-normal and fault-parallel strong-motion displacements. It is shown that the common design rules for selection of the strength-reduction factors are usually conservative and approximately describe the reduction amplitudes near faults of strong earthquakes for fault-normal pulses. However, for fault-parallel displacements, the same reduction factors are not conservative and must be changed. It is recommended that for design close to active faults, the strength-reduction factors for all components of motion should be constant for long periods and equal to (2 μ−1) 1/2, where μ is ductility. For periods shorter than about 1 s, these strength reduction factors should be further reduced by 30–40%.
ISSN:0267-7261
1879-341X
DOI:10.1016/j.soildyn.2007.01.006