地震动有效幅值不对称性特征研究
|
摘要
利用国内外287次5级以上的实际地震记录,研究了地震动有效幅值的不对称性特征及其规律。分别用有效幅值不对称比和有效幅值作用次数不对称比来描述地震动的不对称性,统计结果具有规律性,并提出了其估计公式。结果表明:地震动有效幅值不对称性和有效幅值作用次数不对称性特征明显,幅值不对称比的平均值不受震级影响,但与截断比呈非线性递增关系,截断比小于1/3时不对称比在1.07～1.20之间,截断比大于1/3时不对称比在1.13～1.96之间;有效幅值作用次数不对称比的平均值不受震级影响,但与截断比呈非线性递增关系,截断比小于1/3时作用次数不对称比在1.04～1.31之间变化,截断比大于1/3时作用次数不对称比在1.22～1.80之间。
Using the records of 287 earthquakes,the magnitudes of which are greater than 5,the asymmetrical characteristics of effective amplitudes of ground motion are investigated.Using asymmetry ratios of effective amplitudes and effective cyclic numbers,the asymmetry of ground motions is described with regular results are regular,and its calculation formula is presented.The statistic results indicate that the asymmetrical characteristics of the effective amplitudes and effective cyclic number are obvious.The averages of asymmetry ratios of effective amplitudes are not influenced by magnitudes,but increase with the increase of cut-off ratios.The averages of asymmetry ratios are between 1.07~1.20 when the cut-off ratios are lower than 1/3,the cut-off ratios are higher than between 1.13~1.96 when the cut-off ratio are higher than 1/3.The averages of asymmetry ratios of effective cyclic number are not influenced by magnitudes,but increase with the increase of cut-off ratios.The averages of asymmetry ratios are between 1.04~1.31,when the cut-off ratios are lower than 1/3;the averages of asymmetry rations are between 1.22~1.80,when the cut-off ratios are higher than 1/3.
Using the records of 287 earthquakes,the magnitudes of which are greater than 5,the asymmetrical characteristics of effective amplitudes of ground motion are investigated.Using asymmetry ratios of effective amplitudes and effective cyclic numbers,the asymmetry of ground motions is described with regular results are regular,and its calculation formula is presented.The statistic results indicate that the asymmetrical characteristics of the effective amplitudes and effective cyclic number are obvious.The averages of asymmetry ratios of effective amplitudes are not influenced by magnitudes,but increase with the increase of cut-off ratios.The averages of asymmetry ratios are between 1.07~1.20 when the cut-off ratios are lower than 1/3,the cut-off ratios are higher than between 1.13~1.96 when the cut-off ratio are higher than 1/3.The averages of asymmetry ratios of effective cyclic number are not influenced by magnitudes,but increase with the increase of cut-off ratios.The averages of asymmetry ratios are between 1.04~1.31,when the cut-off ratios are lower than 1/3;the averages of asymmetry rations are between 1.22~1.80,when the cut-off ratios are higher than 1/3.
引文
[1]董娣,桑向国,杨建.地震动强度包络线对称性的研究[J].防灾减灾工程学报,2007,27(2):217-222.DONG Di,SANG Xiangguo,YANG Jian.Studies on the symmetry of amplitude envelope line of ground motion[J].Journal of Disaster Preventand Mitigation Engineering,2007,27(2):217-222.(in Chinese)
[2]谢定义,巫志刚.不规则动荷脉冲波对砂土液化特性的影响[J].岩土工程学报,1987,9(4):1-12.XIE Dingyi,WU Zhigang.Effect of irregular dynamic impulse history on liquefaction characteristics of saturated sand[J].Chinese Journal ofGeotechnical Engineering,1987,9(4):1-12.(in Chinese)
[3]张永华,谢定义.不规则动应力条件下孔压的发展规律及其预测方法研究[C]//第四届全国土动力学学术会议论文集,1994:7-12.
[4]袁晓铭,孙锐,孟上九.土体地震大变形分析中Seed有效循环次数方法的局限性[J].岩土工程学报,2004,26(2):207-211.YUAN Xiaoming,SUN Rui,MENG Shangjiu.Limitation of Seed’s method of significant cyclic number in analyzing large deformation of soils dur-ing earthquake[J].Chinese Journal of Geotechnical Engineering,2004,26(2):207-211.(in Chinese)
[5]汪闻昭.往返荷载下的饱和砂[J].岩土工程学报,1981,3(3):61-65.WANG Wenshao.Saturated sands under cyclic loading[J].Chinese Jounal of Geotechnical Engineering,1981,3(3):61-65.(in Chinese)
[6]沈智刚,Harder L F.随机荷载下砂土的动力反应[J].国外地震工程,1981(1):52-58.SHEN Zhigang,Harder L F.Dynamic response of a sand under random loadings[J].Overseas Earthquake Engineering,1980,3(1):52-58.(in Chinese)
[7]孟凡超,袁晓铭,孙锐,等.加速度峰值不对称性特征及其影响[J].自然灾害学报,2008,17(1):191-196.MENG Fanchao,YUAN Xiaoming,SUN Rui,et al.Study on characteristics and effect of asymmetry of peak ground acceleration[J].Journal of Natural Disasters,2008,17(1):191-196.(in Chinese)
[8]孟凡超,袁晓铭,孙锐,等.土体永久变形中地震动有效荷载研究[J].地震工程与工程振动,2009,29(5):170-178.MENG Fanchao,YUAN Xiaoming,SUN Rui,et al.Study on effective loads of ground motion for permanent deformation of soils[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(5):170-178.(in Chinese)
[9]孟凡超.土体永久变形与地震荷载特征关系研究[D].哈尔滨:中国地震局工程力学研究所,2009.
[2]谢定义,巫志刚.不规则动荷脉冲波对砂土液化特性的影响[J].岩土工程学报,1987,9(4):1-12.XIE Dingyi,WU Zhigang.Effect of irregular dynamic impulse history on liquefaction characteristics of saturated sand[J].Chinese Journal ofGeotechnical Engineering,1987,9(4):1-12.(in Chinese)
[3]张永华,谢定义.不规则动应力条件下孔压的发展规律及其预测方法研究[C]//第四届全国土动力学学术会议论文集,1994:7-12.
[4]袁晓铭,孙锐,孟上九.土体地震大变形分析中Seed有效循环次数方法的局限性[J].岩土工程学报,2004,26(2):207-211.YUAN Xiaoming,SUN Rui,MENG Shangjiu.Limitation of Seed’s method of significant cyclic number in analyzing large deformation of soils dur-ing earthquake[J].Chinese Journal of Geotechnical Engineering,2004,26(2):207-211.(in Chinese)
[5]汪闻昭.往返荷载下的饱和砂[J].岩土工程学报,1981,3(3):61-65.WANG Wenshao.Saturated sands under cyclic loading[J].Chinese Jounal of Geotechnical Engineering,1981,3(3):61-65.(in Chinese)
[6]沈智刚,Harder L F.随机荷载下砂土的动力反应[J].国外地震工程,1981(1):52-58.SHEN Zhigang,Harder L F.Dynamic response of a sand under random loadings[J].Overseas Earthquake Engineering,1980,3(1):52-58.(in Chinese)
[7]孟凡超,袁晓铭,孙锐,等.加速度峰值不对称性特征及其影响[J].自然灾害学报,2008,17(1):191-196.MENG Fanchao,YUAN Xiaoming,SUN Rui,et al.Study on characteristics and effect of asymmetry of peak ground acceleration[J].Journal of Natural Disasters,2008,17(1):191-196.(in Chinese)
[8]孟凡超,袁晓铭,孙锐,等.土体永久变形中地震动有效荷载研究[J].地震工程与工程振动,2009,29(5):170-178.MENG Fanchao,YUAN Xiaoming,SUN Rui,et al.Study on effective loads of ground motion for permanent deformation of soils[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(5):170-178.(in Chinese)
[9]孟凡超.土体永久变形与地震荷载特征关系研究[D].哈尔滨:中国地震局工程力学研究所,2009.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心