Study on the Fitting of the Long-Period Ground Motion Acceleration Response Spectrum Based on Genetic Algorithm
【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;
(Translated by LIU T)
 HU Yuxian. Earthquake Engineering [M]. Beijing: Seismological Press, 2006: 491 (in Chinese).
 ZHOU Jing, FANG Xiaodan, JIANG Yi. Characteristic periods of response spectrum for far-field long-period seismic ground motions [J]. Journal of Building Structures, 2015, 36(6): 1–12 (in Chinese).
 LIChunfeng, ZHANG Yang, ZHAO Jinbao, et al. Long-period ground motion characteristic of the 1999 Jiji (Chi-Chi), Taiwan, mainshock and aftershaocks [J]. Acta Seismologica Sinica, 2006, 19(4), 448–460.
 QIU Lishan. Research on design spectrum of far-sourse long-period ground motion based on seismic records from 2008 Wenchuan earthquake, China [D]. Chongqing: Chongqing University, 2016 (in Chinese).
 GENG Shuwei, TAO Xiaxin, WANG Guoxin. Study on the provisions for the value of design response spectra in long period section [J]. World Earthquake Engineering, 2008, 24(2): 111–116 (in Chinese).
 TAN Qian, LI Yingmin, QIU Lishan, et al. Study on the acceleration seismic design response spectrum based on the Wenchuan ground motions and genetic algorithm [J]. China Civil Engineering Journal, 2018, 51(S1): 50–57 (in Chinese).
 W.H.K.Lee, T.C.Shin, K.W.Kuo, K.C.Chen, C.F.Wu. CWB free-field strong-motion data from the 21 September Chi-Chi, Taiwan, Earthquake [J]. Bulletion of the Seismologicail Society of America, 2001, 91(5): 1370–1376 (in Chinese).
 LI Xuehong, WANG Wenke, WU Di, et al. The bounded method and characteristics analysis for long-period ground motions [J]. Journal of Vibration Engineering, 2014, 27(5): 685–692 (in Chinese).
 LI Xuehong, ZHOU Heming, LI Yexuan, et al. Study on the dynamic response characteristics of isolated continuous girder-bridge under far field long-period ground motions [J]. Journal of Natural Disasters, 2016, 25(3): 137–142 (in Chinese).
 GB18306-2015. The China Seismic Ground Motion Parameter Zonation Map [S]. Beijing: China Standards Press, 2015 (in Chinese).
 LV Hongshan, ZHAO Fengxin. Site coefficients suit able to China site category [J]. Acta Seismologica Sinica, 2007, 29(1): 67–76, 114 (in Chinese).
 HAO Min, XIE Lili, WANG Jiaquan. Preliminary assessment of seismic intensity for main region of heavy disaster in Chi-Chi Earthquake [J]. World Earthquake Engineering, 2006, 22(4): 22–26 (in Chinese).
 ZHOU Xiyuan, WANG Guangjun, SU Jingyu. The influence of magnitude and epicentral distance on the characteristics of ground motion spectrum under the same intensity [J]. Earthquake Resistant Engineering and Retrofitting, 1983, Z(1): 49–55 (in Chinese).
 GENG Shuwei, ZHAO Wansong, GAO Yongxin. Research on characteristic periods of response spectrum based on classification of design earthquake [J]. Journal of Hefei University of Technology (Natural Science), 2018, 41(2): 211–215 (in Chinese).
 HUANG Xiaoyan, ZHAO Huasheng, HUANG Ying, et al. An genetic neural netwaork ensemble prediction model for tropical cyclones rainfall in Guangxi [J]. Journal of Natural Disasters, 2017, 26(6): 184–196 (in Chinese).
 ZHANG Liangquan, YU Jianjie. Define and classification of near and far field long period ground motions [J]. Journal of Natural Disasters, 2019, 28(2): 29–36 (in Chinese).
 FANG Xiaodan, WEI Lian, ZHOU Jing. Characteristics of earthquake response for long-period structures and response spectrum [J]. Journal of Building Structures, 2014, 35(3): 16–23 (in Chinese).