| 北京地区中硬场地对地震动加速度反应谱的放大效应研究 |
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| 引用本文： | 李爽,吕悦军,方怡,谢卓娟.北京地区中硬场地对地震动加速度反应谱的放大效应研究[J].震灾防御技术,2017,12(1):133-144. |
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| 作者姓名： | 李爽 吕悦军 方怡 谢卓娟 |
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| 作者单位： | 中国地震局地壳应力研究所, 北京 100085 |
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| 基金项目： | 地震行业科研专项（2014419002）、中央级公益性科研院所基本科研业务（ZDJ2015-04）和北京市自然科学基金（8164065）共同资助 |
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| 摘 要： | 当前，合理确定地震动峰值加速度与反应谱特征周期是工程场地地震动参数确定工作的主要内容。本文以北京地区典型中硬场地为研究对象，分析场地条件对不同周期地震动反应谱值的影响。首先，计算不同震级、震中距条件下的基岩地震动加速度反应谱，合成基岩输入地震动时程；再利用110个工程场地的钻孔资料进行土层地震反应计算，分析中硬场地条件对不同输入环境下的地震动加速度反应谱值的放大效应。结果表明，中硬场地对高、中频震动放大效应明显，尤其是对0.2-0.5s周期段地震动加速度反应谱值的放大倍数大多在1.3以上；场地覆盖层厚度变化对不同频段地震动加速度反应谱值的放大倍数所产生的影响是不同的，与场地自振周期的相关性很强；在不同的地震动输入环境下，中硬场地对不同频段地震动加速度反应谱的影响是不同的，这一结论对实际的抗震设防工作具有一定参考价值。
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| 关 键 词： | 中硬场地 地震动加速度反应谱 场地影响 放大效应 |
| 收稿时间： | 2016/1/4 0:00:00 |
Seismic Amplification Effect on Seismic Acceleration Response Spectrum of Medium-Stiff Soil Site in the Beijing Region |
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| Li Shuang,Lv Yuejun,Fang Yi and Xie Zhuojuan.Seismic Amplification Effect on Seismic Acceleration Response Spectrum of Medium-Stiff Soil Site in the Beijing Region[J].Technology for Earthquake Disaster Prevention,2017,12(1):133-144. |
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| Authors: | Li Shuang Lv Yuejun Fang Yi and Xie Zhuojuan |
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| Institution: | Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China |
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| Abstract: | The determination of the reasonable ground peak accelerations and characteristic periods of response spectrum is the key work in determining seismic ground motion parameters. In this paper, we analyzed the seismic amplification effects of medium-stiff soil site on seismic acceleration response spectrum of different period values in the Beijing region. Firstly, based on the different magnitude and epicenter distance, we chose different bedrock ground motion acceleration response spectrums to determine ground motion inputs. Secondly, we used the bore data of 110 typical engineering sites to calculate the seismic response of the soil layers, and analyzed the amplification effects of medium-stiff soil site on seismic acceleration response spectrum of different period values. The results indicate that the amplification effects of high and medium frequency ground motion are remarkable, especially for the periods range from 0.2s to 0.5s, the magnifications are mostly above 1.3. The influence of the thickness of overlaying layers on the seismic amplification among ground motion acceleration of different frequencies is various, and the influence has strong correlations with the vibration periods of the site. Finally, we pointed out that the seismic amplification effects of medium-stiff soil site under different ground motion inputs are dissimilar, and such conclusion offers references for practical seismic design. |
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| Keywords: | Medium-stiff site Ground motion acceleration response spectrum Seismic effect of site Amplification effect |
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