Study on the Fitting of the Long-Period Ground Motion Acceleration Response Spectrum Based on Genetic Algorithm

ZHANG Liangquan1 YU Jianjie1

(1.School of Civil Engineering, Northeast Forestry University, Harbin, Heilongjiang Province, China 150000)

【Abstract】Due to the relatively low long-period amplitude values and those simplex forms of attenuation, the normative design response spectrum cannot effectively response to the long-period ground motion characteristics. Therefore, it is very significant to adopt a reasonable design response spectrum model to reflect the response spectrum of long-period ground motion. In order to solve this problem, this paper takes the long-period ground motion records of Taiwan Chi-chi Earthquake in 1999 as an example. Firstly, this paper divides the records into groups according to ground acceleration, site classification, and anti-seismic design sectionalization, and makes a contrastive analysis compared with the normative design response spectrum. Secondly, based on the characteristics of the response spectrum of long-period acceleration, a design response spectrum suitable for long-period ground motion is proposed. At the same time, its advantages and disadvantages are contrasted with those of the conventional design response spectrum. The research shows that the long-period design response spectrum proposed in this paper has better applicabilities. The genetic algorithm is used to fit the long-period ground motion response spectrum one by one and the corresponding spectral parameter suggested values are given. What’s more, the long-period ground motion records collected in the Weihe Basin of Wenchuan Earthquake in 2008 are used to verify the reasonability of the spectral parameter suggested values, which provide a reference for the revision of the normative design response spectrum.

【Keywords】 acceleration response spectrum; long-period ground motion; seismic design response spectrum; genetic algorithm;


【Funds】 Fundamental Research Funds for the Central Universities (2572014CB23)

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(Translated by LIU T)


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This Article


CN: 23-1324/X

Vol 28, No. 06, Pages 17-27

December 2019


Article Outline


  • 1 Calculation principle and method of response spectrum
  • 2 Long-period ground motion grouping of Chi-chi Earthquake and its comparison with normative design spectrum
  • 3 Fitting model of long-period design response spectrum
  • 4 Calculation and analysis of design response spectrum parameters of ground motion based on genetic algorithm
  • 5 Values of design response spectrum of long-period ground motion under different groups
  • 6 Analysis of response spectrum fitting of long-period ground motion in Weihe Basin of Wenchuan Earthquake
  • 7 Conclusions
  • References