A Study On Peak Period Characteristics Of Strong Earthquake Records

Our country has always been a country with frequent earthquake, in recent years,both Tangshan earthquake and Wenchuan earthquake are a wake-up call for us. A strong earthquake always causes serious loss of material and a large number of casualties,consequences are very severe.Over the years, scholars are committing to the research of earthquake mechanism more and more deep, we can resist the damage of the earthquake according to our country’s "Code for seismic design of buildings". But the earthquake, especially a strong earthquake has great randomness and uncertain, it is a great help for the rock failure under the action by studying the characteristics of ground motion.The peak of the ground motion plays an important on the soil damage, sometimes even decisive. Some dynamic parameters have a relationship of the vibration frequency characteristic, it always changes a lot, such as the soil, ground, foundation and seismic response of the soil structure in some cases. So, understanding and grasping the peak period characteristics has important significance for Soil Dynamics and Geotechnical Earthquake Engineering, but only a few achievements in this field.In order to achieve the peak non-stationary, first this article selects the seismic records from the Japanese KiK-net strong-motion seismograph network, second,classify the strong-motion records by China’s "Code for seismic design of buildings".Then, comparing the peak period with before and after of different sites respectively,based on the method of crossing-zero. Finally, in order to achieve the relationship between the peak period and the soil conditions we should be comparing the peak period with different site conditions.