强地震动峰值周期特性研究

发布时间：2018-02-11 15:31

本文关键词： 地震动峰值周期穿零法场地条件　出处：《中国地震局工程力学研究所》2015年硕士论文　论文类型：学位论文

【摘要】：我国一直以来都是一个地震频发的国家,近年来先后发生的唐山地震和汶川地震给我们敲响了警钟。强烈地震所带来的后果往往是很严重的,不止是物力的损失,更难以估计的是人力的损失。历年来学者们致力于地震作用机理的研究,随着对地震研究的深入,我们制定了相应的抗震规范来实行,从而可以抵抗地震的破坏作用。地震尤其是强烈地震具有很大的随机性和不确定性,研究地震动的特征,对于地震作用下岩土破坏机理有着很大的帮助。土体地震破坏中,地震动峰值有重要作用,有些情况下甚至起决定作用。土体的一些动力参数与动荷载频率特征有很大关系,随动荷载频率的不同变化很大,整个土体、场地、地基和土工结构的地震响应在某些情况下受动荷载频率影响较大。这样,了解并掌握地震动峰值的周期特征,对土动力学和岩土地震工程的研究有重要意义,但目前这方面的成果尚少。本文利用日本KIK-net台网的强震记录,按照我国的《建筑抗震设计规范》的规定来划分场地类别,然后以穿零法为基础得出不同场地条件下的加速度、速度的峰值周期以及峰值前后平均周期之间的关系,最后在比较峰值周期与场地条件的关系,得到不同场地条件下的地震动峰值的周期特性分布。
[Abstract]:China has always been a country with frequent earthquakes. The Tangshan earthquake and Wenchuan earthquake, which have occurred successively in recent years, have sounded the alarm for us. The consequences of strong earthquakes are often very serious, not just the loss of material resources. What is even more difficult to estimate is the loss of human resources. Over the years, scholars have devoted themselves to studying the mechanism of earthquake action, and with the deepening of seismic research, we have formulated corresponding seismic codes to implement them. The earthquake, especially the strong earthquake, has great randomness and uncertainty. Studying the characteristics of ground motion is of great help to the failure mechanism of rock and soil under earthquake. The peak value of ground motion plays an important role, in some cases it even plays a decisive role. Some dynamic parameters of soil have a great relationship with the characteristics of the frequency of dynamic load. In some cases, the seismic response of foundation and geotechnical structure is greatly affected by the frequency of dynamic load. Thus, it is of great significance to understand and master the periodic characteristics of the peak value of ground motion for the study of soil dynamics and geotechnical seismic engineering. However, there are few achievements in this field at present. In this paper, the strong earthquake records of KIK-net network in Japan are used to classify the sites according to the provisions of the Code for Seismic Design of buildings in China, and then the acceleration under different site conditions is obtained on the basis of the zero-piercing method. The relationship between the peak period of velocity and the average period before and after the peak value is compared. Finally, the periodic characteristic distribution of the peak value of ground motion under different site conditions is obtained by comparing the relationship between the peak period and the site condition.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P315.9

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