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Simulation of multi-support depth-varying earthquake ground motions within heterogeneous onshore and offshore sites

  • Special Section: Tenth Anniversary of the 2008 Wenchuan Earthquake
  • Published:
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Abstract

This paper presents a novel approach to model and simulate the multi-support depth-varying seismic motions (MDSMs) within heterogeneous offshore and onshore sites. Based on 1D wave propagation theory, the three-dimensional ground motion transfer functions on the surface or within an offshore or onshore site are derived by considering the effects of seawater and porous soils on the propagation of seismic P waves. Moreover, the depth-varying and spatial variation properties of seismic ground motions are considered in the ground motion simulation. Using the obtained transfer functions at any locations within a site, the offshore or onshore depth-varying seismic motions are stochastically simulated based on the spectral representation method (SRM). The traditional approaches for simulating spatially varying ground motions are improved and extended to generate MDSMs within multiple offshore and onshore sites. The simulation results show that the PSD functions and coherency losses of the generated MDSMs are compatible with respective target values, which fully validates the effectiveness of the proposed simulation method. The synthesized MDSMs can provide strong support for the precise seismic response prediction and performance-based design of both offshore and onshore large-span engineering structures.

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Authors and Affiliations

  1. State Key Laboratory of Coastal and Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, 116024, China

    Chao Li & Hongnan Li

  2. School of Civil Engineering, Shenyang Jianzhu University, Shenyang, 110168, China

    Hongnan Li

  3. Center for Infrastructure Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University, Kent Street, Bentley, WA, 6102, Australia

    Hong Hao & Kaiming Bi

  4. School of Civil Engineering, Guangzhou University, Guangzhou, 510006, China

    Hong Hao

  5. School of Civil Engineering, Shandong University, Jinan, 250061, China

    Li Tian

Authors
  1. Chao Li
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  2. Hongnan Li
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  3. Hong Hao
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  4. Kaiming Bi
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  5. Li Tian
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Corresponding author

Correspondence to Hongnan Li.

Additional information

Supported by: National Key R&D Program of China under Grant No. 2016YFC0701108 and the State Key Program of National Natural Science Foundation of China under Grant No. 51738007

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Li, C., Li, H., Hao, H. et al. Simulation of multi-support depth-varying earthquake ground motions within heterogeneous onshore and offshore sites. Earthq. Eng. Eng. Vib. 17, 475–490 (2018). https://doi.org/10.1007/s11803-018-0456-7

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  • DOI: https://doi.org/10.1007/s11803-018-0456-7

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