基于强震记录的土层地震反应计算结果分析——以SMASS为例  

Seismic response calculation results of soils based on strong motion records:a case study of SMASS

作　　者：李平 高志寅 周楷 徐建元 陈钰鑫 LI Ping;GAO Zhiyin;ZHOU Kai;XU Jianyuan;CHEN Yuxin(College of Geological Engineering,Institute of Disaster Prevention,Sanhe 065201,Hebei,China;Hebei Key Laboratory of Earthquake Disaster Prevention and Risk Assessment,Sanhe 065201,Hebei,China;Zhongnan Engineering Corporation Limited,PowerChina,Changsha 410014,Hunan,China;Jiangsu Provincial Planning and Design Group Co.,Ltd.,Nanjing 210019,Jiangsu,China)

机构地区：[1]防灾科技学院地质工程学院,河北三河065201 [2]河北省地震灾害防御与风险评价重点实验室,河北三河065201 [3]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014 [4]江苏省规划设计集团有限公司,江苏南京210019

出　　处：《地震工程学报》2025年第3期598-609,共12页China Earthquake Engineering Journal

基　　金：河北省高等学校科学技术研究计划项目(ZD2022166);防灾科技学院研究生创新基金项目(ZY20230306)。

摘　　要：为了探讨一维等效线性化土层地震反应分析方法计算结果与强震观测记录的差异,以河北省地震灾害防御与风险评价重点实验室的场地与结构观测台阵所观测到的古冶和滦州地震强震动记录为基础,选取地下101 m处作为假想基岩输入界面,将一维等效线性化方法(LSSRLI-1程序)计算得到的地下65 m、30 m和地表地震动结果与实际强震观测记录对比分析,得到以下结论:(1)计算得到的地震动峰值加速度变化规律与实际观测结果基本一致,但放大倍数的差值随着计算土层厚度的增加而增大。计算同一土层结构对不同频谱特性地震动的影响时,与实际观测结果具有一定差异。(2)随计算土层厚度的增加,所得反应谱与实际反应谱差值增大,且计算反应谱在地下30 m处出现了“三峰”形状的差异。(3)在浅层土体处,计算反应谱特征周期较实际反应谱有明显的增大。(4)程序计算的傅里叶谱与实际傅里叶谱的差异亦随计算土层厚度的增加而增大,且两者的形状趋势及卓越频率仅在低频区间相吻合。This study examines the discrepancies between calculated results from one-dimensional equivalent linearization soil seismic response analysis and actual strong motion records.The analysis uses data from the seismic monitoring array of site and structure(SMASS)operated by the Hebei Key Laboratory of Earthquake Disaster Prevention and Risk Assessment.Strong motion records from the Guye and Luanzhou earthquakes were analyzed,with a hypothetical bedrock input boundary set at a depth of 101 m.Ground motion results at depths of 65 and 30 m and the surface,calculated using the LSSRLI-1 program,were compared to observed data.Analysis results show the following:(1)Peak ground acceleration(PGA):While the calculated PGA trends generally match observed results,the amplification factor deviates more significantly as soil depth increases.Furthermore,the calculated soil response to ground motions with varying spectral characteristics differs from actual observations.(2)Response spectra:The difference between computed and actual response spectra increases with increasing soil depth.At 30 m depth,the computed spectra exhibit a distinct"triple-peak"anomaly not present in the observed data.(3)Characteristic periods:At shallow soil depths,the computed response spectrum shows a noticeably longer characteristic period compared to the observed spectrum.(4)Fourier spectra:Discrepancies between computed and actual Fourier spectra grow with increasing soil thickness.While both align in the low-frequency range,their trends and predominant frequencies diverge at higher frequencies.

关 键 词：场地与结构观测台阵 一维等效线性化方法 强震动记录 地震动 

分 类 号：P315[天文地球—地震学]