摘要
历次强震表明:局域起伏地形对由高频地震动起决定作用的震害存在显著影响。忽略场地浅表土层的影响,凸起地形场地震害高于凹陷地形。然而,由于地形效应影响因素的复杂多样以及公认地形效应表征模型的缺失,已有的宽频带地震动模拟与预测方法并未考虑高频地震动地形效应,这可能导致对地震动时程及参数的错误估计。为此,本文利用当前较具代表性的地形效应量化表征模型,初步分析了川滇区域高频地震动的地形效应。首先,给出了基于量化表征模型的区域高频地震动地形效应计算分析方案;其次,完整地阐述了该方案在川滇地区的应用,并结合漾濞地震震害考察结果初步验证了川滇高频地震动地形效应分析结果的可靠性;最后,讨论了分析结果的局限并给出其应用于宽频带地震动模拟与预测方法中的初步建议。
Many strong earthquakes indicate that locally undulating terrain has a significant effect on earthquake damage which is mainly determined by high⁃frequency ground motion.If the influence of the soil layer above the shallow surface layer of the site is not considered,the seismic damage of the raised terrain is higher than that of the sunken terrain.However,the factors affecting terrain effects are complex and diverse,and it is well known that there is no consensus on characterization models for terrain effects,and the terrain effects of high⁃frequency ground motion are not considered in the existing broad band seismic simulation and prediction methods,which may lead to errors in the predicted ground motions.Therefore,this paper uses a representative terrain effect quantitative charac⁃terization model at present to preliminarily analyze the terrain effect of high⁃frequency ground motion in the Chuan⁃Dian region.This paper first presents the analysis scheme of the terrain effect of regional high⁃frequency ground motion based on the quantitative characterization model,and then completely expounds the application of this scheme in Chuan⁃Dian region,and preliminarily verifies the reliability of the analysis results of high⁃frequency terrain effect of Sichuan⁃Yunnan in combination with the earthquake damage of Yangbi earthquake.Finally,the paper discusses the limitations of the analysis and the need to incorporate high⁃frequency terrain effects into wide band seismic simulation and prediction methods.
作者
周田宇
梁富源
马完君
谢志南
ZHOU Tianyu;LIANG Fuyuan;MA Wanjun;XIE Zhinan(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)
出处
《世界地震工程》
CSCD
北大核心
2022年第4期26-35,共10页
World Earthquake Engineering
基金
中国地震局工程力学研究所基本科研业务费专项资助项目(2021EEEVL0102)
国家自然科学基金(U2039209)
黑龙江省自然科学基金(YQ2020E005)。
关键词
地形效应
定量表征模型
川滇区域
topography effects
quantitative characterization model
Chuan⁃Dian region
