| 汶川地震黄土地区地震动特征分析 |
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| 引用本文： | 夏坤,王蕾,李方圆,董林.汶川地震黄土地区地震动特征分析[J].世界地震工程,2020,0(4):193-199. |
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| 作者姓名： | 夏坤 王蕾 李方圆 董林 |
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| 作者单位： | 河北工程大学 土木工程学院,河北 邯郸 056038 |
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| 摘 要： | 汶川地震黄土地区强地震动加速度峰值（PGA）较小，然而震害却较为严重，局部场地震害和地震动放大效应显著。选取四川、甘肃及宁夏境内的部分强震动记录，探讨传播距离和场地条件对地震动的影响规律，重点研究黄土地区地震动幅值、频谱、持时特征以及对建筑结构的潜在影响，从地震动特征角度分析该地区震害相对较重的原因。结果表明:汶川地震黄土地区地震动速度峰值较大，地震动中频分量和中长周期成分较为突出；黄土地区自振周期为0.3~1s以及3~4s（尤其是此周期内30~40层）的结构物地震反应将显著放大；设计地震分组为第三组的Ⅲ类黄土场地，加速度反应谱拟合曲线在周期1~3.5s谱值明显高于规范设计谱；黄土场地地表地震动拥有更长持时。
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| 关 键 词： | 黄土地区 幅值特征 反应谱特征 持时特征 建筑震害影响 |
Strong ground motion characteristics of loess area in Wenchuan earthquake |
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| XIA Kun,WANG Lei,LI Fangyuan,DONG Lin.Strong ground motion characteristics of loess area in Wenchuan earthquake[J].World Information On Earthquake Engineering,2020,0(4):193-199. |
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| Authors: | XIA Kun WANG Lei LI Fangyuan DONG Lin |
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| Affiliation: | School of Civil Engineering, Hebei University of Engineering, Handan 056038, China |
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| Abstract: | The field investigations of the Wenchuan earthquake indicated that amplification effects of site conditions and topography on ground motion were very obvious in loess regions. There is a common question why the small peak ground acceleration (PGA) did cause relatively serious damage of loess area in Wenchuan Earthquake. In this paper, a detailed analysis among station logs of Sichuan, Gansu and Ningxia in Wenchuan earthquake was carried out, the relations between ground motion and influencing factors in terms of propagation distance and site conditions were investigated, the characteristics of their amplitude, response spectrum and duration and the potential effect on the earthquake damage were analyzed. The results show that:the peak ground velocities (PGVs) of loess area in Wenchuan earthquake are big, medium frequency and medium-long-period component relatively rich; the building with natural period about 0.3-1 second (corresponding to the natural periods of 3-10 stories buildings mostly common in the moderate and small cities and towns of China) and 3-4 second (especially, 30-40 stories high-rise buildings) on the soil sites in loess regions will undergo obvious amplification effect, but the long-period building with the natural period greater than 5 second will do not have much effect; the pseudo-acceleration spectrum of design earthquake-3th group and site-class Ⅲ significantly larger than Chinese design response spectra in period 1-3.5s; along with the increase of propagation distance, the bracketed duration and energy duration of strong motion increases, so that duration of strong motion on the soil sites in loess regions was significantly prolonged. |
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| Keywords: | loess area amplitude characteristic response spectrum characteristic duration characteristic potential effect on earthquake damage |
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