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Modeling of fully non-stationary ground motions based on random phase difference spectrum
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Qingxia LV1, Zhangjun LIU1, Yunmu JIANG1, 2, Zixin LIU3
Earthquake Engineering and Engineering Dynamics | 2024, 44(5) : 139 - 148
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Earthquake Engineering and Engineering Dynamics | 2024, 44(5): 139-148
Modeling of fully non-stationary ground motions based on random phase difference spectrum
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Qingxia LV1, Zhangjun LIU1, Yunmu JIANG1, 2, Zixin LIU3
Affiliations
  • 1.School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430074, China
  • 2.State Key Laboratory of Coastal and Offshore Engineering, Dalian 116024, China
  • 3.Key Laboratory of Building Collapse Mechanism and Disaster Prevention, Institute of Disaster Prevention, China Earthquake Administration, Sanhe 065201, China
doi: 10.13197/j.eeed.2024.0513
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In order to reasonably represent the fully non-stationarity and randomness of the land acquisition seismic process, a random seismic model based on a combination of phase difference spectrum and power spectrum has been developed. Firstly, the relationship between phase difference and non-stationarity of seismic ground motion was elucidated, and the identification and statistical analysis of phase difference spectrum model parameters were carried out using strong motion records. Secondly, power spectrum models with deterministic and stochastic parameters were used to obtain the values of deterministic parameters and the normalized optimal probability distribution of stochastic parameters, respectively. Finally, by selecting representative point sets of basic random parameters, the corresponding representative time history set of seismic acceleration was obtained. The calculation example shows that the method in this paper only requires 2 or 4 basic random variables to simulate the seismic acceleration process with natural variability and rich probability information, and the simulated acceleration response spectrum fits well with the strong motion records. The study lays the foundation for applying probability density evolution theory to the random seismic response and seismic reliability refinement analysis of complex engineering structures.

random phase difference spectrum  /  power spectrum  /  random parameters  /  parameter identification  /  measured strong earthquake records
Qingxia LV, Zhangjun LIU, Yunmu JIANG, Zixin LIU. Modeling of fully non-stationary ground motions based on random phase difference spectrum[J]. Earthquake Engineering and Engineering Dynamics, 2024 , 44 (5) : 139 -148 . DOI: 10.13197/j.eeed.2024.0513
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Year 2024 volume 44 Issue 5
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Article Info
doi: 10.13197/j.eeed.2024.0513
  • Receive Date：2023-07-12
  • Online Date：2026-03-30
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  • Received：2023-07-12
  • Revised：2023-09-15
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Affiliations
    1.School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430074, China
    2.State Key Laboratory of Coastal and Offshore Engineering, Dalian 116024, China
    3.Key Laboratory of Building Collapse Mechanism and Disaster Prevention, Institute of Disaster Prevention, China Earthquake Administration, Sanhe 065201, China
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表12种不同金属材料的力学参数
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Number of
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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