Statistical analysis of vertical ground motion characteristics in near-fault regions
Li Ning1,2,3 Liu Hongguo1,2 Liu Ping4 Li Zhongxian1,2,3 Xie Lili5
1. School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. Key Laboratory of Coast Civil Structure Safety of the Ministry of Education,
Tianjin University, Tianjin 300072, China; 3. Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China
Earthquake Administration, Tianjin University, Tianjin 300350, China; 4. Ren’ai College, Tianjin University, Tianjin 301636, China;
5. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150090, China
Abstract：To study the vertical ground motion characteristics of the near-fault regions, 890 sets of ground motions were selected from the ground motion database of the Pacific Earthquake Engineering Research Center (PEER). The statistical relationship of the vertical-to horizontal-peak acceleration ratio aV/aH with respect to the moment magnitude, the fault distance, the site conditions and the fault mechanism is analyzed, and a reasonable value of aV/aH in the near-fault regions is suggested. In addition, the energy-based identification method is used to classify whether the near-fault ground motion includes pulses or not. The relationships between vertical/horizontal pulse parameters and the seismic characteristic parameters are studied respectively, and the attenuation relationships of the peak velocity/period between the vertical pulse and the horizontal pulse are compared. The results show that the vertical peak acceleration and horizontal peak acceleration ratio aV/aH in the near-fault regions is affected by the seismic characteristic parameters. The specified value of 2/3 in the design code may underestimate the vertical ground motion in the near-fault regions. Compared with the horizontal pulse, the number of the vertical pulses is relatively small and the distribution of vertical pulses is narrow. In addition, differences in the peak velocity and periods of the horizontal and vertical pulses may also be observed.
李宁 刘洪国 刘平 李忠献 谢礼立. 近断层竖向地震动特征统计分析[J]. 土木工程学报, 2020, 53(10): 120-128.
Li Ning Liu Hongguo Liu Ping Li Zhongxian Xie Lili. Statistical analysis of vertical ground motion characteristics in near-fault regions. 土木工程学报, 2020, 53(10): 120-128.
