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This study investigates the influence of ground motion duration on the damping reduction factor through response spectrum analysis of single-degree-of-freedom systems with various damping ratio levels. The significant duration (DS5-95) is chosen as the measure for ground motion duration. By using 84 pairs of long-duration (LD) and short-duration (SD) spectrally equivalent records, the effect of ground motion duration is decoupled from the acceleration spectral shape. The average damping reduction factors for the LD and SD sets are calculated within the range of natural periods from 0 to 6 seconds at different damping ratio levels. The effects of damping ratio, natural period, and DS5-95 on the damping reduction factor are quantitatively analyzed. A nonlinear regression model is proposed to account for the influence of ground motion duration on the damping reduction factor, with the regression parameters provided. The results indicate that, for a linear single-degree-of-freedom system, the influence of ground motion duration on the damping reduction factor depends on the natural period and damping ratio. In the short-period range, DS5-95 has no significant effect on the damping reduction factor、However, in the long-period range, the damping reduction factor tends to decrease as DS5-95 increases.
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基于单自由度体系中不同阻尼比水平的反应谱分析,该文研究了地震动持续时间对阻尼折减系数的影响。选择显著持时(DS5-95)作为衡量地震动持时的指标。通过使用84对长持时组(long-duration, LD)和短持时组(short-duration, SD)频谱等效的地震动记录,可以将地震动持时与其加速度反应谱形状的影响解耦。通过在不同阻尼比水平下反应谱分析结果计算得出LD组与SD组在自振周期0~6 s范围内的平均阻尼折减系数,定量分析阻尼比、自振周期以及DS5-95对阻尼折减系数的影响。采用非线性回归分析,提出了一个考虑地震动持时影响的阻尼折减系数回归模型并给出了模型回归参数。结果表明,对于弹性单自由度系统,地震动持时对阻尼折减系数的影响与自振周期和阻尼比有关。在短周期范围内,DS5-95对阻尼折减系数没有显著影响;然而,在长周期范围内,阻尼折减系数会随着DS5-95的增长呈减小趋势。
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Bulletin of the Seismological Society of America,
2009,
99(6): 3217-3233., articleTitle=Empirical equations for the prediction of the significant, bracketed, and uniform duration of earthquake ground motion, refAbstract=null)], funds=[Fund(id=1241802956778045952, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, awardId=52408344; 52278512, language=CN, fundingSource=国家自然科学基金项目(52408344; 52278512), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1241802948523655964, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, xref=null, ext=[AuthorCompanyExt(id=1241802948557210404, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, companyId=1241802948523655964, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Department of Civil Engineering, Sichuan University, Chengdu 610065, China), AuthorCompanyExt(id=1241802948565599015, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, companyId=1241802948523655964, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=四川大学土木工程系,四川成都610065)])], figs=[ArticleFig(id=1241802953577791700, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Fig. 1, caption=
SSE distribution of each pair of ground motions, figureFileSmall=e0mokO5B/4RmshmdXOgzZA==, figureFileBig=NNPLpepWPz+8lL2QiMSXjw==, tableContent=null), ArticleFig(id=1241802953686843613, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=图1, caption=
每对地震动的SSE分布, figureFileSmall=e0mokO5B/4RmshmdXOgzZA==, figureFileBig=NNPLpepWPz+8lL2QiMSXjw==, tableContent=null), ArticleFig(id=1241802953829449964, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Fig. 2, caption=
A pair of spectrally equivalent LD and its corresponding LD ground motions, figureFileSmall=iBX8ALyJ1NPDaZzTw3Mw/A==, figureFileBig=fZUHTU0C4QRA7NyccmBcBg==, tableContent=null), ArticleFig(id=1241802953951084794, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=图2, caption=
一对频谱等效的SD与对应LD地震动, figureFileSmall=iBX8ALyJ1NPDaZzTw3Mw/A==, figureFileBig=fZUHTU0C4QRA7NyccmBcBg==, tableContent=null), ArticleFig(id=1241802954081108231, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Fig. 3, caption=
Distributions of ground motion characteristic parameters of the selected SD and LD sets, figureFileSmall=41RAgkTGevx4s/UzdoV8Vg==, figureFileBig=+6SIO7vJVx8cVY8ChR5SEQ==, tableContent=null), ArticleFig(id=1241802954194354454, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=图3, caption=
所选SD组与LD组地震动特征参数分布, figureFileSmall=41RAgkTGevx4s/UzdoV8Vg==, figureFileBig=+6SIO7vJVx8cVY8ChR5SEQ==, tableContent=null), ArticleFig(id=1241802954328572197, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Fig. 4, caption=
Pseudo-acceleration spectra of the selected SD and LD ground motion sets, figureFileSmall=aiiHcheHyk0Vlumn0DYR3Q==, figureFileBig=qHLquh9P/qXRccKlbwzH3A==, tableContent=null), ArticleFig(id=1241802954450207023, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=图4, caption=
所选SD组与LD组地震动拟加速度谱, figureFileSmall=aiiHcheHyk0Vlumn0DYR3Q==, figureFileBig=qHLquh9P/qXRccKlbwzH3A==, tableContent=null), ArticleFig(id=1241802954538287419, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Fig. 5, caption=
Average damping reduction factor under different damping ratios, figureFileSmall=ib0s80ym4hLoceXNHFLUdg==, figureFileBig=BZoN8ZxRe//7jVc3Yeo55A==, tableContent=null), ArticleFig(id=1241802954655727946, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=图5, caption=
不同阻尼比下平均阻尼折减系数, figureFileSmall=ib0s80ym4hLoceXNHFLUdg==, figureFileBig=BZoN8ZxRe//7jVc3Yeo55A==, tableContent=null), ArticleFig(id=1241802954748002645, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Fig. 6, caption=
Influence of significant duration DS5-95 on DRF, figureFileSmall=5dpuTGXSMVPlCXNgUVkfEA==, figureFileBig=IKnMBFTzS68NAx04gJ37NQ==, tableContent=null), ArticleFig(id=1241802954882220384, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=图6, caption=
显著持时DS5-95对DRF的影响, figureFileSmall=5dpuTGXSMVPlCXNgUVkfEA==, figureFileBig=IKnMBFTzS68NAx04gJ37NQ==, tableContent=null), ArticleFig(id=1241802955008049514, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Fig. 7, caption=
Distribution of ln(η), figureFileSmall=/sVL/hoLW3K9P57vct0saw==, figureFileBig=d5viCQDyFNTHIBi6/bvHhw==, tableContent=null), ArticleFig(id=1241802955188404609, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=图7, caption=
ln(η)的分布, figureFileSmall=/sVL/hoLW3K9P57vct0saw==, figureFileBig=d5viCQDyFNTHIBi6/bvHhw==, tableContent=null), ArticleFig(id=1241802955335205262, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Fig. 8, caption=
Fitted curves of 
, figureFileSmall=5bD6fCHW9GlpRvVTaC47Mw==, figureFileBig=VHyXbBHVEc0aMBGSFtoMVQ==, tableContent=null), ArticleFig(id=1241802955502977435, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=图8, caption=
拟合曲线, figureFileSmall=5bD6fCHW9GlpRvVTaC47Mw==, figureFileBig=VHyXbBHVEc0aMBGSFtoMVQ==, tableContent=null), ArticleFig(id=1241802955637195180, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Fig. 9, caption=
Regression model of DRF considering significant duration, figureFileSmall=BBxouxb6j7hXd6OkdjABWQ==, figureFileBig=agyNZBA5yDllVsZkbjiRIg==, tableContent=null), ArticleFig(id=1241802955767218611, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=图9, caption=
考虑持时的DRF回归模型, figureFileSmall=BBxouxb6j7hXd6OkdjABWQ==, figureFileBig=agyNZBA5yDllVsZkbjiRIg==, tableContent=null), ArticleFig(id=1241802955888853434, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Fig. 10, caption=
Variation of DRF with the period, figureFileSmall=tGa9tF6MdoC+d/4PqrWeow==, figureFileBig=ModpWXLNgJ+Ecda9ON7b6w==, tableContent=null), ArticleFig(id=1241802956010488261, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=图10, caption=
DRF随周期变化情况, figureFileSmall=tGa9tF6MdoC+d/4PqrWeow==, figureFileBig=ModpWXLNgJ+Ecda9ON7b6w==, tableContent=null), ArticleFig(id=1241802956140511697, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Table 1, caption=
Selecting criteria for ground motions in LD sets
, figureFileSmall=null, figureFileBig=null, tableContent=
| 地震记录特征 | 单位 | 筛选范围 | 地震记录特征 | 单位 | 筛选范围 |
|---|
| 断层距(Rrup) | km | 10~250 | 峰值地面加速度(PGA) | g | ≥0.1 |
| 显著持时(DS5-95) | s | 30~90 | 峰值地面速度(PGV) | cm/s | ≥10 |
| 震级(MW) | — | ≥5.0 | 最低可用频率(LUF) | Hz | ≥0.167 |
), ArticleFig(id=1241802956299895258, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=表1, caption=
LD组地震动筛选标准
, figureFileSmall=null, figureFileBig=null, tableContent=
| 地震记录特征 | 单位 | 筛选范围 | 地震记录特征 | 单位 | 筛选范围 |
|---|
| 断层距(Rrup) | km | 10~250 | 峰值地面加速度(PGA) | g | ≥0.1 |
| 显著持时(DS5-95) | s | 30~90 | 峰值地面速度(PGV) | cm/s | ≥10 |
| 震级(MW) | — | ≥5.0 | 最低可用频率(LUF) | Hz | ≥0.167 |
), ArticleFig(id=1241802956425724389, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=EN, label=Table 2, caption=
Regression coefficients for the DRF model
, figureFileSmall=null, figureFileBig=null, tableContent=
| 周期/s | 回归系数/(×10-2) |
|---|
 |  |  |  |  |  |  |  |  |
|---|
| 0.10 | 6.91 | -4.09 | -1.29 | 3.66 | -5.48 | 1.47 | -2.86 | 2.27 | -0.78 |
| 0.25 | 7.79 | -4.98 | -3.48 | 4.53 | -1.51 | 1.94 | -3.48 | 2.37 | -1.25 |
| 0.50 | 6.12 | -2.58 | -5.27 | 4.79 | -5.25 | -1.42 | -4.21 | 3.92 | 0.81 |
| 0.80 | 5.26 | -1.41 | -7.35 | 4.56 | -3.88 | -0.39 | 1.25 | 1.28 | 0.56 |
| 1.00 | 4.92 | -9.77 | 0.47 | -5.08 | -4.61 | -1.27 | 2.08 | 1.01 | 0.32 |
| 1.50 | 7.95 | -5.00 | 0.64 | -6.66 | -5.23 | -1.22 | -1.95 | 3.25 | 0.04 |
| 3.00 | 8.16 | -6.06 | 1.13 | -9.12 | 2.45 | -2.18 | 3.27 | -1.13 | 0.36 |
| 5.00 | 10.05 | -8.98 | 1.97 | -5.83 | -2.93 | 1.73 | 2.63 | -1.25 | -0.11 |
| 6.00 | 9.48 | -8.01 | 2.12 | -3.68 | -3.32 | 1.61 | 2.31 | -1.85 | -0.05 |
), ArticleFig(id=1241802956551553518, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1241794072801771861, language=CN, label=表2, caption=
DRF模型回归系数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 周期/s | 回归系数/(×10-2) |
|---|
 |  |  |  |  |  |  |  |  |
|---|
| 0.10 | 6.91 | -4.09 | -1.29 | 3.66 | -5.48 | 1.47 | -2.86 | 2.27 | -0.78 |
| 0.25 | 7.79 | -4.98 | -3.48 | 4.53 | -1.51 | 1.94 | -3.48 | 2.37 | -1.25 |
| 0.50 | 6.12 | -2.58 | -5.27 | 4.79 | -5.25 | -1.42 | -4.21 | 3.92 | 0.81 |
| 0.80 | 5.26 | -1.41 | -7.35 | 4.56 | -3.88 | -0.39 | 1.25 | 1.28 | 0.56 |
| 1.00 | 4.92 | -9.77 | 0.47 | -5.08 | -4.61 | -1.27 | 2.08 | 1.01 | 0.32 |
| 1.50 | 7.95 | -5.00 | 0.64 | -6.66 | -5.23 | -1.22 | -1.95 | 3.25 | 0.04 |
| 3.00 | 8.16 | -6.06 | 1.13 | -9.12 | 2.45 | -2.18 | 3.27 | -1.13 | 0.36 |
| 5.00 | 10.05 | -8.98 | 1.97 | -5.83 | -2.93 | 1.73 | 2.63 | -1.25 | -0.11 |
| 6.00 | 9.48 | -8.01 | 2.12 | -3.68 | -3.32 | 1.61 | 2.31 | -1.85 | -0.05 |
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