设计特征周期的影响因素

Influence Factors of Design Characteristic Period

本文以我国抗震规范设计特征周期的修正为前提,统计计算设计特征周期的取值。共收集美国中西部地区437条中强地震记录,采用地震波处理软件SeismoSignal进行处理分析,并对设计特征周期的影响因素进行了研究。对强震数据库的覆盖率及可用性进行研究,表明数据采集合理。将美国数百条地震动记录按震级、震中距、场地类别等条件分类,主要统计计算Ⅰ、Ⅱ、Ⅲ类场地特征周期的取值,研究三因素对特征周期的影响,并进行了线性回归分析。分析结果表明:不同的场地类别和震级对设计反应谱特征周期取值有显著的影响。特征周期值随场地变软而增大,与震级具有良好的线性相关,与震中距相关性不明显。

Based on the modified values of design feature period in seismic code for the premise,statistical calculated the design feature period value.437 strong earthquake records in Midwestern United States were collected.Seismic wave processing software,SeismoSignal,was used to statistics calculate design feature period value and research the affecting factors on design characteristics period.Coverage and usability research of strong earthquake record database showed that this database acquisition is reasonable.Hundreds of United States earthquake records were classified,according to magnitude,epicenter,site classification to statistically calculate mainly the feature period value forⅠ,Ⅱ,Ⅲ kind of site.The three factors including the site classification,the magnitude,the epicenter which influences the value of characteristics period,was analyzed in linear regression way.The results show that different categories,magnitudes and epicenters,have significant influence on the design response spectrum characteristic value.If the site condition is softer,the feature period value becomes larger.And feature period has good linear relation with the magnitude,but the relevance of the epicenter is not obvious.