摘要
利用266条强震记录,在研究绝对输入能量谱和相对输入能量谱衰减规律的基础上, 对由衰减关系所确立的两种输入能量谱进行对比分析,讨论了延性系数对这两种输入能量谱 的影响．研究发现,在弹性情况下,两种输入能量谱在周期O．5～1．0 s范围内相差不大;在 非弹性情况下,两种输入能量谱存周期O．5 s处相差不大．周期较小时,绝对输入能量谱要大 于相对输入能量谱;周期较大时,绝对输入能量谱小于相对输入能量谱．延性系数对这两种 输入能量谱影响均比较大,对绝对输入能量谱而言,周期小于0．3 s时,随着延性系数的增 大,能量谱升高;周期大于O．3 s时,随着延性系数的增大能量谱降低．不同延性系数的绝对 输入能量谱存分界点0．3 s左右相等．相对输入能量谱受延性系数影响与绝对输入能量谱相 似,但分界点在0．5 s左右．与绝对输入能量谱相比,相对输入能量谱在短周期段受延性系数 的影响较大,特别是当场地较软时更为明显．
Based on 266 strong ground motion records, an attenuation relationship was developed for both absolute and relative input energy spectra. The comparison of the two kinds of input energy spectra constructed from the attenuation relationship was made in this paper. The results show that there is little difference between the absolute input energy spectra and relative ones at the periods of 0.5 - 1.0 s for elastic systems and at the period of 0.5 s for inelastic systems. The absolute input energy spectra are much larger than relative ones in very short period range but some less than relative ones in long period range. It is also found that the ductility factor has a significant effect on both absolute and relative input energy spectra. The absolute input energy spectra increase with the increasing of ductility factor for the periods less than 0. 3 s but decrease for the periods larger than 0. 3 s. The absolute input energy spectra for different ductility factor are almost equivalent at the period about 0.3 s, but for relative input energy spectra, the period is about 0.5 s. The effect of ductility on the relative input energy spectra in the short period range is much larger than that on the absolute input energy spectra, especially on the softer site class.
出处
《地震学报》
CSCD
北大核心
2005年第6期666-676,共11页
Acta Seismologica Sinica
基金
黑龙江省自然科学基金(E0221)和科技部社会公益研究专项基金(2001DIB20098)资助.
关键词
输入能量谱
地震动
衰减规律
延性系数
两步回归法
input energy spectra
ground motion
attenuation relationship
ductility factor
two-stage regressive method
