土层与基岩场地地震动长周期成分的一致性分析  

Consistency analysis of long-period ground motion components of soil and rock sites

作　　者：刘培玄 周正华[2] 赵纪生 刘红帅 

机构地区：[1]地壳运动监测工程研究中心,北京100036 [2]南京工业大学,江苏南京210009

出　　处：《世界地震工程》2017年第1期284-291,共8页World Earthquake Engineering

基　　金：中国地震局地震科技星火计划项目(XH13032Y);国家自然科学基金项目(51278474);国家重大科技专项项目(2013ZX06002001-9);地壳运动监测工程研究中心主任基金项目(NEIS201401)

摘　　要：以3条人造合成地震动和3条强震动记录为地震动输入,建立了四类场地的6个土层地震反应分析模型,采用一维等效线性化波动方法,研究确定了覆盖土层厚度对地震动频带影响范围;并以日本kik-net三维台站强震动记录为基础,通过井下记录与地表记录反应谱的对比分析,对数值模拟结果进行了可靠性分析。结果表明:场地覆盖土层对某一频率范围内的地震动有显著放大作用,土层与基岩场地的周期大于6s的长周期成分具有较好的一致性。这一结论可为扩充研究基岩长周期地震动衰减关系的基础数据提供参考。The six site seismic response analysis models were established from 3 artificial resultant and 3 strong seismic records. The effects of the soil layer thickness on frequency range of ground motions were determined using the one-dimension equivalent linear wave method. Based on the strong motion records of Japanese KiK-net, the response spectra of the downhole and surface records were compared to verify the reliability of the numerical simulation. The results show that soil layer has significant amplification effects on the ground motions in certain frequency range, and that the response spectra, whose periods are longer than 6s, have good consistency between the records from soil and bedrock. The obtained results may give a reference to extending the basic study data on bedrock long- period attenuation relationship of acceleration response spectra.

关 键 词：覆盖土层 长周期 反应谱 一维等效线性化 kik-net 

分 类 号：TU378[建筑科学—结构工程]