铁道科学与工程学报2025，Vol.22Issue(11)：4784-4795,12.DOI:10.19713/j.cnki.43-1423/u.T20250197
区域高速铁路轨道-桥梁系统地震响应分布特征分析
Seismic response distribution characteristics of regional high-speed railway track-bridge system
摘要
Abstract
Regional seismic response assessment of railway engineering structures is critical for postearthquake traffic functionality and repair decision-making.However,owing to the limited number of seismic stations,current practices largely rely on interpolated data from existing records or empirical judgments,which may not adequately capture spatial variability.This study aimed to verify and comparatively analyze the effectiveness and limitations of existing methods.Using the 2013 Lushan earthquake as a case study,an integrated seismic wave propagation model was developed that combines the earthquake source,geological conditions,and topography of the site.The spectral element method(SEM)was used to simulate the entire process of seismic wave propagation from the earthquake source through the medium to the complex surface topography.The accuracy of the model was validated by comparing it with ground motion data recorded at seismic stations(the maximum peak ground acceleration(PGA)error was 11.3%).Kriging interpolation was then applied to generate PGA distribution maps for both the observed and simulated seismic motions.These maps were subsequently used to derive response distribution maps for the high-speed railway track-bridge system(HSRTBS)under seismic excitation.By comparing and analyzing the HSRTBS responses derived from kriging interpolation of observed and simulated seismic motions,the differences between the two approaches were investigated.Although the PGA values from recorded ground motions at seismic stations were similar to those of the simulated ground motions,the interpolated PGA values at other locations were significantly lower than the simulated values,especially in areas with complex topography.Specifically,in one such area,the observed and simulated PGA values were 0.28g and 0.81g,respectively,a nearly threefold difference.The PGA and HSRTBS response maps generated by kriging interpolation of the simulated ground motions had a relatively high resolution.The overall PGA range increased significantly from 0.12g(0.16g～0.28g)to 0.753g(0.057g～0.81g).Furthermore,this method can reflect the seismic risk characteristics of local bridges,especially in areas with significant topographic variation,where the changes are more pronounced.These findings align with conclusions from existing studies on local topographic amplification effects and provide important insights for assessing and assessing the seismic damage levels of high-speed railway bridges in specific regions.The proposed method,which integrates GIS-based geological and topographic reconstruction with the spectral element method for seismic simulation,can effectively capture regional ground motion characteristics and offer a valuable tool for postearthquake damage assessment and decision-making for high-speed railway bridges.Compared with traditional interpolation methods based on sparse observed data,the proposed approach significantly can enhance spatial resolution and better captures localized site effects and topographic influences.This approach can greatly reduce the underestimation of local structural responses caused by homogenized interpolation,making it an effective approach under the current limitation of seismic station density in China.关键词
区域高铁桥梁/Kriging插值/谱元法/地震动模拟/地震响应云图Key words
regional high-speed railway bridge/Kriging interpolation/spectral element method/seismic simulation/seismic response contour map分类
交通工程引用本文复制引用
蒋丽忠,李伟,江力强..区域高速铁路轨道-桥梁系统地震响应分布特征分析[J].铁道科学与工程学报,2025,22(11):4784-4795,12.基金项目
国家重点研发计划资助项目(2022YFC3004304) （2022YFC3004304）
国家自然科学基金资助项目(52378209) （52378209）
湖南省科技计划湖湘青年英才资助项目(2023RC3057) （2023RC3057）
