结构工程师Issue(5)：117-123,7.
考虑矩震级影响的位移谱阻尼调整系数
Damping Scaling Factor with a Consideration of Influence of Moment Magnitude
摘要
Abstract
The influence of moment magnitude ( Mw ) on damping scaling factor ( DSF) was firstly investigated based on the statistical analysis of 408 earthquake ground motion records .It is showed that the effect of Mw on DSF depends on period of vibration ( T) and damping ratio (ξ) .The DSF increases as Mw increases for the periods greater than about 0.6 s ifξ<5%, but it decreases ifξ>5%.The pattern with Mw is much more sig-nificant as T increases orξdeviates from 5%.Almost no pattern with Mw is seen for the periods less than about 0.6 s.DSF is significantly affected by T when Mw =5~6.The influence of T on DSF becomes less significant with the increase of Mw for the periods greater than about 0.6 s.When Mw =7 ~8 DSF does not basically change with T within the range of periods greater than 0.6 s except DSF corresponding to 0.5% and 1%damping .The heteroscedasticity in the DSF with respect to ξexists.Then DSF regression equation was pro-posed that only depends on T andξand equation residuals was calculated at specified T andξ.Finally accord-ing to the residual plots showing an almost linear relationship with Mw at long periods , the regression model that includes a linear magnitude term was proposed and regression coefficients were tabulated .Residual analysis shows that the proposed model can reflect the influence of Mw on DSF and can indirectly reflect the influence of significant duration ( D5-95 ) on DSF .The standard deviation of the model can reflect heteroscedasticity in the DSF with respect toξ.关键词
矩震级/阻尼调整系数/周期/阻尼比/重要持时Key words
moment magnitude/damping scaling factor/period/damping ratio/significant duration引用本文复制引用
王国弢,胡克旭,雷敏..考虑矩震级影响的位移谱阻尼调整系数[J].结构工程师,2014,(5):117-123,7.基金项目
国家科技支撑计划重点项目 （）
