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

作     者：Li Chao Li Hongnan Hao Hong Bi Kaiming Tian Li 

作者机构：State Key Laboratory of Coastal and Offshore EngineeringFaculty of Infrastructure EngineeringDalian University of Technology School of Civil EngineeringShenyang Jianzhu University Center for Infrastructure Monitoring and ProtectionSchool of Civil and Mechanical EngineeringCurtin University School of Civil EngineeringGuangzhou University School of Civil EngineeringShandong University 

出 版 物：《Earthquake Engineering and Engineering Vibration》 (地震工程与工程振动（英文刊）)

年 卷 期：2018年第17卷第3期

页      面：475-490页

核心收录：

学科分类：08[工学] 0818[工学-地质资源与地质工程] 081304[工学-建筑技术科学] 0815[工学-水利工程] 0813[工学-建筑学] 0802[工学-机械工程] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 

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

主　　题：seismic motion simulation onshore and offshore sites ground motion spatial variation depth-varying motions transfer function 

摘      要：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 1 D 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.