摘要
局部场地条件是决定场地地震动强度和频谱的重要因素,基于强震动和脉动记录的统计分析,获取表征场地条件影响的特征参数已成为确定工程场地设计地震动的较经济和实用方法,特别是对于大范围或难以开展现场勘测的工程场地。利用日本KiK-net台网强震动记录计算分析了台站场地地震动水平/竖向谱比(HVSR)与地表/基底谱比(SBSR)的差异,揭示SBSR/HVSR与HVSR呈对数线性分布的统计特征,并给出其定量关系,据此提出表征场地对地震动影响的修正水平/竖向谱比法。修正水平/竖向谱比法具有仅需地表观测记录的优势,并进一步考虑了场地竖向地震效应对水平/竖向谱比法精度的影响,更能合理地表征场地对地震动的影响。
During an earthquake,local site conditions are an important factor in determining the intensity and spectrum of ground motion.Statistical analysis to obtain characteristic parameters to characterize the influence of site conditions based on strong-motion and microtremor has become a more economical and practical method to determine the design ground motion of engineering sites,especially for a large survey area or an engineering site that are difficult to carry out site survey.The differences between the surface-to-bedrock spectral ratio(HVSR)and the horizontal-to-vertical spectral ratio(SBSR)of the strong-motion station sites were analyzed by using the strong-motion records from the Japanese KiK-net network,the statistical characteristics of log linear relation between SBSR/HVSR and HVSR was revealed,and a quantitative relationship between them was obtained,and then a modified horizontal-tovertical spectral ratio method was proposed to characterize the influence of site conditions on ground-motion.This modified method has the advantage that the HVSR method only needs surface records,and further considers the influence of the vertical seismic effect on the accuracy of the HVSR method.The modified HVSR method can more reasonably characterize the influence of site conditions on ground-motion.
作者
李小军
李娜
王巨科
朱俊
张斌
Li Xiaojun;Li Na;Wang Juke;Zhu Jun;Zhang Bin(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)
出处
《震灾防御技术》
CSCD
北大核心
2021年第1期81-90,共10页
Technology for Earthquake Disaster Prevention
基金
国家重点研发计划(2017YFC1500400)
国家自然科学基金(U1839202)。
关键词
场地条件
强震动记录
KiK-net台网
水平/竖向谱比
地表/基底谱比
Site condition
Strong-motion record
KiK-net strong-motion station
Horizontal-to-vertical spectral ratio(HVSR)
Surface-to-bedrock spectral ratio(SBSR)
