摘要
针对岩石硬土场地(Ⅰ类)、粘滞阻尼比为0.05、材料模型为双线性的单自由度系统,在考虑了实测地震记录的场地条件、记录的加速度反应谱、地震震级和震中距及结构的自振周期、结构的延性等因素的影响下,探讨了如何对地震时程记录按照某一恰当的放大系数(可以小于1)进行放大,使之与任意给定结构的周期特性相匹配,从而为给定结构提供或选择最匹配的地震时程记录用于结构时程分析。分析中,考虑了三种放大方法,即单点放大系数法、区间放大系数法和PGA放大系数法,并分析和比较了由这三种方法计算出的平均加速度和方差,由此推荐了最优的放大地震时程记录的方法。在此基础上,从世界范围内的大量强震记录中,选出了可适用于9度区岩石硬土场地上做结构时程分析用的三个实测强震记录,以供研究人员和工程师选用。
In this paper, methods for selecting records recorded on rock/stiff soil sites and used to time history analysis are developed in terms of 5 % damped single-degree-of-freedom systems. In the selection of records, site condition, the response spectra of acceleration, earthquake magnitude, epicentral distance, structural fundamental period, structural ductility factor, and bilinear force and deformation relation taken into account. Three methods are applied to match the design spectrum, which are at the fundamental period, at a period range, and at peak ground acceleration （PGA）. Comparison of mean accelerations and standard deviations from the three methods is carried out, and so the best method is selected and recommended. On the basis of the study, three strong motion records are selected appropriate for seismic fortification intensity of 9 and rock/stiff soil sites.
出处
《工程抗震与加固改造》
北大核心
2009年第2期118-122,共5页
Earthquake Resistant Engineering and Retrofitting
关键词
时程记录
放大
岩石硬土场地
时程分析法
抗震设计
earthquake record
amplification
rock/stiff soil sites
time history analysis
seismic design
