输入基岩地震波数量对土层地震反应影响研究
Research on the influence of the number of input ground motion on soil seismic response
赵晶 1李建亮 2王世元 3李福海4
作者信息
- 1. 四川交通职业技术学院,四川 成都 611130
- 2. 四川工商学院 建筑工程学院,四川 成都 611745
- 3. 四川省地震局,四川 成都 610041
- 4. 西南交通大学 土木工程学院,四川 成都 611756
- 折叠
摘要
以成都某地铁站点工程场地为例,采用一维等效线性化方法,将人工合成的不同超越概率下各 20 条相互独立的地震波作为基岩输入地震动时程,进行了土层地震反应计算,并对计算结果进行了分析研究,得出结论:1)通过对土层地震反应结果的计算分析,给出了PGA、Tg 和Sa(T)值计算结果参数的变异系数和随概率档的变化规律,并验证了上述各参数均值都服从正态分布.2)对于II级和地震小区划工作,目前业内较为普遍地采用 3 条基岩地震波作为土层地震反应计算基岩输入地震动时程的做法和现行地震安评国标的规定,至少采用 3 条基岩地震波作为输入地震动时程下限数量的规定已不能满足要求,需要增加,建议增加到最少采用 15 条基岩输入地震波,以保证地震安评工作所提供的场地设计地震动参数更加可靠.
Abstract
Taking an actual project in Chengdu as an example,using one-dimensional equivalent linearization method,the calculation of soil earthquake response under the different numbers of the input ground motion has been carried out.The following conclusions are obtained:1)By calculating and analyzing the seismic response results,the variation coefficient of each parameter and the variation rule with probability are obtained,and the mean value of each parameter is verified to obey normal distribution.2)For Category II and earthquake microzonation work,the general practice of three bedrock seismic waves for soil seismic response analysis can not meet the practical demands at present,and the lower limit of three seismic waves for soil seismic response analysis in the current seismic safety assessment standard is not adequate.It is recommended that at least 15 independent synthetic bedrock seismic waves should be used as the input ground motion in soil seismic response.
关键词
输入地震动时程/样本数量/地震动参数/离散性/国标下限Key words
input ground motion/sample number/ground motion parameter/discreteness/national standard lower limit引用本文复制引用
基金项目
四川省科技计划项目(2020JDKP0066)
四川交通职业技术学院科技教育发展基金项目(2023-YB-KJ-01)
出版年
2024
NETL
NSTL
万方数据