Abstract
This study proposed a simple and effective response spectrum-compatible ground motions simulation method to mitigate the scarcity of ground motions on seismic hazard analysis base on wavelet-based multi-resolution analysis. The feasibility of the proposed method is illustrated with two recorded ground motions in El Mayor-Cucapah earthquake. The results show that the proposed method enriches the ground motions exponentially. The simulated ground motions agree well with the attenuation characteristics of seismic ground motion without modulating process. Moreover, the pseudo-acceleration response spectrum error between the recorded ground motion and the average of the simulated ground motions is 5.2%, which fulfills the requirement prescribed in Eurocode 8 for artificially simulated ground motions. Besides, the cumulative power spectra between the simulated and recorded ground motions agree well on both high- and low-frequency regions. Therefore, the proposed method offers a feasible alternative in enriching response spectrum-compatible ground motions, especially on the regions with insufficient ground motions.
Highlights
The input of ground motion significantly affects the seismic hazards analysis[1] and risk assessment.[2,3] most anti-seismic design Standards, such as Eurocode 84 and ASCE7-16,5 have particular requirements for the artificial ground motions
According to Eurocode 8,4 the response spectrum error between the artificial ground motions and the target spectrum should be less than 10% in damping ratio equaling 5%
The simulated ground motions meet the requirements for artificial ground motion in Standards
Summary
The input of ground motion significantly affects the seismic hazards analysis[1] and risk assessment.[2,3] most anti-seismic design Standards, such as Eurocode 84 and ASCE7-16,5 have particular requirements for the artificial ground motions. The response spectrum-compatible ground motions are significant for seismic hazard analysis.[6]. Two methods are commonly applied to obtain the response-spectrum matching ground motions in engineering fields, that is, simulating artificial ground motions[7,8] and selecting ground motion from recorded databases.[9,10] For the former methods, the ground motion simulation methods could be briefly divided into two categories, named physical-based method and stochastic method.
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