本文關鍵詞： 地震動 峰值周期 穿零法 場地條件　出處：《中國地震局工程力學研究所》2015年碩士論文　論文類型：學位論文

【摘要】：我國一直以來都是一個地震頻發(fā)的國家,近年來先后發(fā)生的唐山地震和汶川地震給我們敲響了警鐘。強烈地震所帶來的后果往往是很嚴重的,不止是物力的損失,更難以估計的是人力的損失。歷年來學者們致力于地震作用機理的研究,隨著對地震研究的深入,我們制定了相應的抗震規(guī)范來實行,從而可以抵抗地震的破壞作用。地震尤其是強烈地震具有很大的隨機性和不確定性,研究地震動的特征,對于地震作用下巖土破壞機理有著很大的幫助。土體地震破壞中,地震動峰值有重要作用,有些情況下甚至起決定作用。土體的一些動力參數(shù)與動荷載頻率特征有很大關系,隨動荷載頻率的不同變化很大,整個土體、場地、地基和土工結構的地震響應在某些情況下受動荷載頻率影響較大。這樣,了解并掌握地震動峰值的周期特征,對土動力學和巖土地震工程的研究有重要意義,但目前這方面的成果尚少。本文利用日本KIK-net臺網(wǎng)的強震記錄,按照我國的《建筑抗震設計規(guī)范》的規(guī)定來劃分場地類別,然后以穿零法為基礎得出不同場地條件下的加速度、速度的峰值周期以及峰值前后平均周期之間的關系,最后在比較峰值周期與場地條件的關系,得到不同場地條件下的地震動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.
【學位授予單位】：中國地震局工程力學研究所
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P315.9

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本文編號：1503389