Vector-Valued Uniform Hazard Spectra

2012 ◽  
Vol 28 (4) ◽  
pp. 1549-1568 ◽  
Author(s):  
Shun-Hao Ni ◽  
De-Yi Zhang ◽  
Wei-Chau Xie ◽  
Mahesh D. Pandey
Keyword(s):  
Seismic Hazard ◽  
Seismic Design ◽  
Hazard Analysis ◽  
Occurrence Rate ◽  
Simultaneous Occurrence ◽  
Uniform Hazard Spectra ◽  
Design Spectrum ◽  
Performance Based Seismic Design ◽  
Design Earthquake ◽  
Vector Valued

Uniform hazard spectra (UHS) have been used as design earthquakes in several design codes. However, as the results from scalar probabilistic seismic hazard analysis (PSHA), UHS do not provide knowledge about the simultaneous occurrence of spectral accelerations at multiple vibration periods. The concept of a single “design earthquake” is then lost on a UHS. In this study, a vector-valued PSHA combined with scalar PSHA is applied to establish an alternative design spectrum, named vector-valued UHS (VUHS). Vector-valued seismic hazard deaggregation (SHD) is also performed to determine the design earthquake in terms of magnitude, distance, and occurrence rate for the VUHS. The proposed VUHS preserves the essence of the UHS and can also be interpreted as a single design earthquake. To simplify the procedure for generating the VUHS, so that they can be easily incorporated into performance-based seismic design, an approximate method is also developed.

scholarly journals Seismic Hazard Assessment for the Tianshui Urban Area, Gansu Province, China

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Zhenming Wang ◽  
David T. Butler ◽  
Edward W. Woolery ◽  
Lanmin Wang
Keyword(s):  
Seismic Hazard ◽  
Ground Motion ◽  
Seismic Design ◽  
Hazard Analysis ◽  
Seismic Hazard Assessment ◽  
Gansu Province ◽  
Mitigation Measures ◽  
Peak Ground Velocity ◽  
Ground Acceleration ◽  
Acceleration Time Histories

A scenario seismic hazard analysis was performed for the city of Tianshui. The scenario hazard analysis utilized the best available geologic and seismological information as well as composite source model (i.e., ground motion simulation) to derive ground motion hazards in terms of acceleration time histories, peak values (e.g., peak ground acceleration and peak ground velocity), and response spectra. This study confirms that Tianshui is facing significant seismic hazard, and certain mitigation measures, such as better seismic design for buildings and other structures, should be developed and implemented. This study shows that PGA of 0.3 g (equivalent to Chinese intensity VIII) should be considered for seismic design of general building and PGA of 0.4 g (equivalent to Chinese intensity IX) for seismic design of critical facility in Tianshui.

Probabilistic seismic hazard analysis and design earthquakes: Closing the loop

1995 ◽  
Vol 85 (5) ◽  
pp. 1275-1284 ◽  
Author(s):  
Robin K. McGuire
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Large Earthquake ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Ground Shaking ◽  
Uniform Hazard Spectrum ◽  
Analysis And Design ◽  
Design Earthquake

Abstract Probabilistic seismic hazard analysis (PSHA) is conducted because there is a perceived earthquake threat: active seismic sources in the region may produce a moderate-to-large earthquake. The analysis considers a multitude of earthquake occurrences and ground motions, and produces an integrated description of seismic hazard representing all events. For design, analysis, retrofit, or other seismic risk decisions a single “design earthquake” is often desired wherein the earthquake threat is characterized by a single magnitude, distance, and perhaps other parameters. This allows additional characteristics of the ground shaking to be modeled, such as duration, nonstationarity of motion, and critical pulses. This study describes a method wherein a design earthquake can be obtained that accurately represents the uniform hazard spectrum from a PSHA. There are two key steps in the derivation. First, the contribution to hazard by magnitude M, distance R, and ɛ must be maintained separately for each attenuation equation used in the analysis. Here, ɛ is the number of standard deviations that the target ground motion is above or below the median predicted motion for that equation. Second, the hazard for two natural frequencies (herein taken to be 10 and 1 Hz) must be examined by seismic source to see if one source dominates the hazard at both frequencies. This allows us to determine whether it is reasonable to represent the hazard with a single design earthquake, and if so to select the most-likely combination of M, R, and ɛ (herein called the “beta earthquake”) to accurately replicate the uniform hazard spectrum. This closes the loop between the original perception of the earthquake threat, the consideration of all possible seismic events that might contribute to that threat, and the representation of the threat with a single (or few) set of parameters for design or analysis.

DETERMINISTIC SEISMIC HAZARD ANALYSIS OF ANDAMAN AND NICOBAR ISLANDS

2013 ◽  
Vol 07 (04) ◽  
pp. 1350035
Author(s):  
N. P. KATARIA ◽  
M. SHRIKHANDE ◽  
J. D. DAS
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Tectonic Setting ◽  
Seismic Hazard Assessment ◽  
Active Regions ◽  
Seismogenic Zone ◽  
Ground Acceleration ◽  
Design Spectrum ◽  
Seismogenic Source ◽  
Deterministic Seismic Hazard

An important component of hazard mitigation is to estimate the future hazard for design calculations. In the present study, a deterministic seismic hazard assessment of Andaman and Nicobar region is carried out, which is one of the most seismically active regions of India. The study area is divided into seven seismogenic source zones based on seismicity and tectonic setting. For ground motion estimation at Andaman and Nicobar, for each seismogenic zone different attenuation relationship is used as per tectonic setting of that seismogenic zone. In order to generate the site specific design spectrum, final results are calculated in the form of peak ground acceleration (PGA) and 5%-damped pseudo-spectral acceleration (PSA) for 0.2 s and 1 s. Calculated results are compared with some earlier works for the studied area and the probable reasons for variations are discussed.

The Design Spectrum Curve of Seismic Performance for Reinforced Concrete Structure

2008 ◽  
Vol 400-402 ◽  
pp. 731-736
Author(s):  
Xing Wen Liang ◽  
Yue Sheng Tong ◽  
Li Xin
Keyword(s):  
Seismic Design ◽  
Lateral Displacement ◽  
Reinforced Concrete Structure ◽  
Single Degree Of Freedom ◽  
Design Spectrum ◽  
Single Degree ◽  
Performance Based Seismic Design ◽  
Earthquake Action ◽  
Design Requirements ◽  
Spectrum Curve

The performance-based seismic design of structure is in a research and development situation. A method is proposed in this paper to adapt the present demand. This method is based on the current Chinese code for seismic design of buildings. In design process, the earthquake action and lateral displacement are considered, and thus the design spectrum curve for equivalent single degree of freedom system is established. Thus the performances of structure at different earthquake levels are obtained and checked to satisfy the design requirements. After accomplishment of design, an elasto-plastic static analysis of structure may be conducted to fully examine its performance.

Sign in / Sign up

Export Citation Format

Share Document