scholarly journals EFFECTS OF COMPOSITION OF TWO HORIZONTAL COMPONENTS ON ATTENUATION OF MAXIMUM EARTHQUAKE GROUND MOTIONS AND RESPONSE SPECTRA

1983 ◽  
Vol 1983 (329) ◽  
pp. 49-56 ◽  
Author(s):  
Kazuhiko KAWASHIMA ◽  
Koh AIZAWA ◽  
Kazuyuki TAKAHASHI
Keyword(s):  
Ground Motions ◽  
Response Spectra ◽  
Earthquake Ground Motions ◽  
Maximum Earthquake

DAMAGE EVOLUTION SPECTRA FOR SEISMIC ANALYSIS OF HIGH-RISE BUILDINGS

2012 ◽  
Vol 06 (03) ◽  
pp. 1250021
Author(s):  
Y. B. HO ◽  
J. S. KUANG
Keyword(s):  
Damage Evolution ◽  
Seismic Analysis ◽  
Ground Motions ◽  
Time History ◽  
Tall Buildings ◽  
Response Spectra ◽  
Seismic Damage ◽  
Analysis And Design ◽  
High Rise ◽  
Earthquake Ground Motions

Seismic response spectra are amongst one of the most important tools for characterizing earthquake ground motions. In design practice, the response spectra are presented without including any load history, hence the nonlinear analysis of structures based solely on conventional earthquake response spectra is theoretically unsound, particularly for long-period or vertically irregular high-rise buildings. In this paper, a concept of seismic damage evolution is introduced and the method of analysis for characterizing the process of seismic damage to structures under earthquakes is presented. Seismic damage evolution spectra for analysis and design of high-rise buildings are then developed as an effective means of describing and simplifying earthquake ground motions. These spectra are shown to be very useful in selecting the ground motion-time history and, particularly, validating the equivalent static-load analysis and design of high-rise buildings under near-fault pulse-like ground motions. Case studies of the seismic inelastic performance of two vertically irregular, tall buildings are presented considering the seismic damage evolution spectra.

scholarly journals DESIGN EARTHQUAKE GROUND MOTIONS FROM PROBABILISTIC RESPONSE SPECTRA: CASE STUDY OF NEPAL

2008 ◽  
Vol 8 (4) ◽  
pp. 16-28 ◽  
Author(s):  
Hari PARAJULI ◽  
Junji KIYONO ◽  
Yusuke ONO ◽  
Takahiro TSUTSUMIUCHI
Keyword(s):  
Ground Motions ◽  
Response Spectra ◽  
Earthquake Ground Motions ◽  
Probabilistic Response ◽  
Design Earthquake

Effects of Frequency Content of Earthquake Ground Motions on Probabilistic Seismic Demand Assessment of Long-Span Bridge Structures

2011 ◽  
Vol 255-260 ◽  
pp. 982-987
Author(s):  
Liang Chen ◽  
Jin Song Zhang
Keyword(s):  
Ground Motions ◽  
Geometric Mean ◽  
Response Spectra ◽  
Seismic Demand ◽  
Frequency Content ◽  
Earthquake Ground Motions ◽  
Long Span ◽  
Long Span Bridge ◽  
Demand Assessment ◽  
Probabilistic Seismic Demand

Earthquake ground motions were reasonally selected for the nonlinear dynamic time-history analysis conducted for a two-tower long-span cable-stayed bridge. The correlation between frequency content of earthquake ground motions and probabilistic seismic demands reveals that the geometric mean and dispersion of response spectra from earthquake ground motions have significant effects on probabilistic seismic demand assessment of long-span bridge stuctures and these effects are related to the difference of the shape of geometric mean spectra in the important period ranges where cumulative modal mass participation is significant. Response spectra of selected earthquake ground motions should match well with target spectra in the important period ranges. If input ground motions are reasonally selected, analytic results can be obtained more precisely and effectively and more amplitude parameters can be selected as intensity measures.

Selection and Scaling of Ground Motion Time Histories for Structural Design Using Genetic Algorithms

2004 ◽  
Vol 20 (2) ◽  
pp. 413-426 ◽  
Author(s):  
Farzad Naeim ◽  
Arzhang Alimoradi ◽  
Shahram Pezeshk
Keyword(s):  
Ground Motions ◽  
Response Spectra ◽  
Single Individual ◽  
Least Mean Square ◽  
Scaling Factors ◽  
Design Spectrum ◽  
Earthquake Ground Motions ◽  
Earthquake Records ◽  
Target Spectrum ◽  
Scaling Methods

This paper presents a new approach to selection of a set of recorded earthquake ground motions that in combination match a given site-specific design spectrum with minimum alteration. The scaling factors applied to selected ground motions are scalar values within the range specified by the user. As a result, the phase and shape of the response spectra of earthquake ground motions are not tampered with. Contrary to the prevailing scaling methods where a preset number of earthquake records (usually between a single component to seven pairs) are selected first and scaled to match the design spectrum next, the proposed method is capable of searching a set consisting of thousands of earthquake records and recommending a desired subset of records that match the target design spectrum. This task is achieved by using a genetic algorithm (GA), which treats the union of 7 records and corresponding scaling factors as a single “individual.” The first generation of individuals may include a population of, for example, 200 records. Then, through processes that mimic mating, natural selection, and mutation, new generations of individuals are produced and the process continues until an optimum individual (seven pairs and scaling factors) is obtained. The procedure is fast and reliable and results in records that match the target spectrum with minimal tampering and the least mean square of deviation from the target spectrum.

A subset of CyberShake ground-motion time series for response-history analysis

2021 ◽  
pp. 875529302098197
Author(s):  
Jack W Baker ◽  
Sanaz Rezaeian ◽  
Christine A Goulet ◽  
Nicolas Luco ◽  
Ganyu Teng
Keyword(s):  
Time Series ◽  
Los Angeles ◽  
Seismic Hazard ◽  
Ground Motion ◽  
Ground Motions ◽  
Response Spectra ◽  
Motion Time ◽  
History Analysis ◽  
Response History Analysis ◽  
Simulated Ground Motions

This manuscript describes a subset of CyberShake numerically simulated ground motions that were selected and vetted for use in engineering response-history analyses. Ground motions were selected that have seismological properties and response spectra representative of conditions in the Los Angeles area, based on disaggregation of seismic hazard. Ground motions were selected from millions of available time series and were reviewed to confirm their suitability for response-history analysis. The processes used to select the time series, the characteristics of the resulting data, and the provided documentation are described in this article. The resulting data and documentation are available electronically.

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