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输入界面对场地地表地震动参数的影响
曹均锋,冯伟栋,董双林,原贺军
安徽省地震局,安徽合肥市长江西路558 号230031
摘要:
本文以江淮地区典型场地资料为原型,选取不同深度的岩层位置作为地震动输入界面,构造多种场地土层模型,选择Taft、Kobe 和E1centro 3 条强震记录作为地震输入,采用一维频域等效线性化波动方法重点分析了地震动输入界面对场地地表地震动参数的影响。研究结果表明,随着输入界面深度的增加,场地地表的峰值加速度逐渐增加,且增加的幅度呈逐渐减小的趋势,但输入界面深度对地表加速度反应谱特征周期的影响较小;输入界面剪切波速值对反应谱特征周期影响有限,但对地表峰值加速度影响较为显著,地表峰值加速度随着输入界面剪切波速的增大而增大,且两者的增幅呈现近似的线性关系。
关键词:  输入界面  剪切波速  峰值加速度  特征周期
DOI:
分类号:
基金项目:安徽省地震科研青年基金项目20120707 和20140301 联合资助
Effect of seismic wave inputting interface on the ground motion parameters of site surface
Cao Junfeng, Feng Weidong, Dong Shuanglin, Yuan Hejun
Earthquake Administration of Anhui Province,Hefei 230031,China
Abstract:
Based on the data from typical sites in the Jianghuai region,many kinds of soil layer sites for the seismic response was modeled by choosing different depth strata as the seismic wave inputting interfaces. The seismic wave inputting interface effect on ground motion parameters was analyzed with the one dimension equivalent linear method in frequency domain by choosing the Taft,Kobe and Elcentro strong motion records as the earthquake input. The results show that when the inputting interface depth increases,the peak ground acceleration increases,and the increase rate decreased,but the depth changes of the inputting interface have less effect on the characteristic period of the acceleration response spectra. Meanwhile,the shear velocity variation of the inputting interface has little influence on the characteristic period of the acceleration response spectra,but it has significant influence on the peak ground acceleration. The peak ground acceleration increases with the shear velocity variation of the inputting interface,and both increase linearly approximate.
Key words:  Inputting interface  Shear velocity  Peak acceleration  Characteristic period