文章摘要

文章信息/Info

Title:: Definition and Selection of Long-period Ground Motion Based on the Anti-seismic Analysis

作者:: 许立英¹; 刘宁²; 吴应雄^2; (1.西南科技大学土木工程与建筑学院,四川绵阳 621010; 2.福州大学土木工程学院,福建福州 350108)

Author(s):: XU Liying¹; Liu Ning²; WU Yingxiong²; (1.College of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)(2.College of Civil Engineering,Fuzhou University,Fujian 350108,Fuzhou, China)

Keywords:: long-period ground motion; long-period component; average period; energy proportion; definition criteria

摘要:: 收集273条地震动信息并进行滤波处理,综合考虑地震动断层距、PGA、PGV/PGA及平均周期等地震动基本参数指标,对比其反应谱、傅里叶谱以及能量谱,归纳了近场脉冲、远场类谐和这2类特殊长周期地震动与近、远场普通地震动的界定标准; 通过引入能量持时占比及地震动长周期分量能量占比等频谱参数,用于复核长周期地震动界定结果。结果表明:长周期地震动的反应谱衰减速率慢,在长周期段的谱值大于普通地震动; 长周期地震动具有能量大且集中于低频区域的特点。

Abstract:: In order to provide parameter bases for the selection of long-period ground motions for anti-seismic analysis,273 pieces of ground motions information is collected and filtered,which considered the basic parameters such as fault distance,PGA,PGV/PGA and average period of the ground motion.The response spectrum,Fourier spectrum and energy spectrum are compared to summarize the definition criteria of two kinds of special long-period ground motions and near-field and far-field ordinary ground motions; spectral parameters such as the energy duration ratio and the energy ratio of long-period components of ground motions are introduced to review the long-period ground motion definition results.The results show that the attenuation rate of response spectrum of long-period ground motion is slow,and the spectrum value of long-period ground is larger than that of the ordinary ground motion.Long-period ground motion has the characteristics that the seismic energy is large and concentrated in low frequency region.