摘要
选取Ⅰ类、Ⅱ类和Ⅲ类场地的25个地震台站记录按转动分量和平动分量的关系生成扭转分量,再计算扭转反应谱的特征周期。对其进行统计分析,结果表明:场地对转动分量的特征周期的影响最为明显;场地越软,特征周期越大;震中距越大,特征周期越大,但是随震中距的增大,其变化幅度很小。
The seismic records of 25 stations at Class I,Ⅱand Ⅲ site in Wenchuan are selected in the paper. The torsional component is calculated according to the relationship between translation component and rotational components,and then the characteristical period of the torsional response spectrum is obtained by the relative theory. It is statistically analyzed and the results show that the most prominent influence on the characteristical period is site,the softer the site,the greater the characteristical period,the greater the epicentral distance,the bigger the characteristical period. Along with the increase of the epicentral distance,its amplitude varys very small.
出处
《低温建筑技术》
2015年第10期44-47,共4页
Low Temperature Architecture Technology
基金
上海师范在学科研基金项目(SK201341)
关键词
场地类型
扭转反应谱
特征周期
site classification
torsional response spectrum
characteristical period
