考虑持时影响的位移谱阻尼调整系数  

Influence of Earthquake Duration on the Damping Scaling Factor

作　　者：王国弢[1] 胡克旭[1] 雷敏[1] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092

出　　处：《结构工程师》2014年第4期12-18,共7页Structural Engineers

基　　金：国家科技支撑计划重点项目(2009BAJ28B02)

摘　　要：根据对408条地震地面运动记录的统计分析,首先研究了相对能量持时(D5-95)对位移谱阻尼调整系数(DSF)的影响。结果表明:D5-95对DSF的影响与周期(T)和阻尼比(ξ)有关;在长周期范围内,当ξ<5%时,DSF随着D5-95的增长而增长;当ξ>5%时,DSF随着D5-95的增长而减小;随着T的增长,D5-95对DSF的影响越显著;ξ越远离5%,D5-95对DSF的影响越显著;在短周期范围内,D5-95对DSF无显著影响;DSF相对于ξ存在异方差性。最后根据对只与周期和阻尼比有关的DSF回归方程的残差分析,提出了能反映D5-95影响的DSF回归模型并给出了模型的回归系数。残差分析表明:该模型能体现长周期范围内D5-95对DSF的影响。模型的标准差能体现DSF相对于ξ的异方差性。The influence of the earthquake significant duration （D5 -95 ）on the damping scaling factor （DSF） was investigated by statistical analysis of 408 earthquake ground motion records.The study shows that the effect of the D5 -95 on the DSF depends on the vibration period （T）and the damping ratio （ξ）.The DSF increases as the D5 -95 increases for long period situations if ξ〈5%;but it decreases if ξ〉5%.The impact of the D5 -95 is more significant as the T increases or ξdeviates from 5%.Almost no impact was observed for short period scenarios.The heteroscedasticity in the DSF distribution with respect to ξexists.Based on the analysis of DSF regression features that depend on T and ξ,a regression model that can reflect the influence of the D5 -95 on the DSF was proposed and the regression coefficients were tabulated.Studies show that the proposed model can reflect the influence of the D5 -95 on the DSF.The standard deviation of the model can re-flect heteroscedasticity characteristics of the DSF with respect to ξ.

关 键 词：相对能量持时 阻尼调整系数 阻尼比 

分 类 号：TU352.11[建筑科学—结构工程]