Analysis of strong earthquake ground motion for prediction of response spectra

1973 ◽  
Vol 2 (1) ◽  
pp. 59-69 ◽  
Author(s):  
Mihailo D. Trifunac
Keyword(s):  
Ground Motion ◽  
Strong Earthquake ◽  
Response Spectra ◽  
Earthquake Ground Motion ◽  
Prediction Of Response

Evaluation of Earthquake Response Spectra Directionality Using Stochastic Simulations

2021 ◽  
Author(s):  
Alan Poulos ◽  
Eduardo Miranda ◽  
Jack W. Baker
Keyword(s):  
Stochastic Process ◽  
Ground Motion ◽  
Ground Motions ◽  
Gaussian White Noise ◽  
Response Spectra ◽  
Orientation Dependence ◽  
Stochastic Simulations ◽  
Earthquake Ground Motion ◽  
Significant Duration ◽  
Simulated Ground Motions

ABSTRACT For earthquake-resistant design purposes, ground-motion intensity is usually characterized using response spectra. The amplitude of response spectral ordinates of horizontal components varies significantly with changes in orientation. This change in intensity with orientation is commonly known as ground-motion directionality. Although this directionality has been attributed to several factors, such as topographic irregularities, near-fault effects, and local geologic heterogeneities, the mechanism behind this phenomenon is still not well understood. This work studies the directionality characteristics of earthquake ground-motion intensity using synthetic ground motions and compares their directionality to that of recorded ground motions. The two principal components of horizontal acceleration are sampled independently using a stochastic model based on finite-duration time-modulated filtered Gaussian white-noise processes. By using the same stochastic process to sample both horizontal components of motion, the variance of horizontal ground acceleration has negligible orientation dependence. However, these simulations’ response spectral ordinates present directionality levels comparable to those found in real ground motions. It is shown that the directionality of the simulated ground motions changes for each realization of the stochastic process and is a consequence of the duration being finite. Simulated ground motions also present similar directionality trends to recorded earthquake ground motions, such as the increase of average directionality with increasing period of vibration and decrease with increasing significant duration. These results suggest that most of the orientation dependence of horizontal response spectra is primarily explained by the finite significant duration of earthquake ground motion causing inherent randomness in response spectra, rather than by some physical mechanism causing polarization of shaking.

AN IMPROVED METHOD OF MATCHING RESPONSE SPECTRA OF RECORDED EARTHQUAKE GROUND MOTION USING WAVELETS

2006 ◽  
Vol 10 (sup001) ◽  
pp. 67-89 ◽  
Author(s):  
JONATHAN HANCOCK ◽  
JENNIE WATSON-LAMPREY ◽  
NORMAN A. ABRAHAMSON ◽  
JULIAN J. BOMMER∗ ◽  
ALEXANDROS MARKATIS ◽  
...  
Keyword(s):  
Ground Motion ◽  
Response Spectra ◽  
Earthquake Ground Motion ◽  
Improved Method ◽  
Matching Response

SEISMIC COLLAPSING ANALYSIS OF ONE-STORY WOODEN KINDERGARTEN STRUCTURE AGAINST STRONG EARTHQUAKE GROUND MOTION

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Tomiya Takatani ◽  
Hayato Nishikawa
Keyword(s):  
Ground Motion ◽  
Strong Earthquake ◽  
Process Analysis ◽  
Ground Motions ◽  
Seismic Intensity ◽  
Earthquake Ground Motion ◽  
Intensity Level ◽  
Wooden Structure ◽  
Old Japanese ◽  
Upper Level

3-D collapsing process analysis of an old Japanese-style one-story wooden structure under two strong earthquake ground motions with a seismic intensity level was car-ried out in order to investigate the seismic performance of this one-story wooden structure without/with seismic retrofit. As a result, this wooden structure collapsed against a strong earthquake ground motion with the JMA seismic intensity “6 upper” level.

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