基于KiK-net强震记录的相干性分析

发布时间：2018-04-21 01:39

本文选题：KiK-net强震记录 + 空间变化　；参考：《南昌航空大学》2017年硕士论文

【摘要】：地震动具有强烈的时间和空间变化特性。对于空间变化性,国内外不少学者探讨了地表测点间地震动相干性,建立了一批实用的相干函数模型,而关于地表与地下测点间的相干性则鲜有文献提及。随着地下工程的大规模开发,了解沿深度方向的地震动相干性对地下结构物的抗震设计与抗震安全非常重要。开展沿深度方向地震动的相干性分析,探讨震级、震中距、场地类别及测点高度差等因素对相干函数的影响规律,建立相应的相干函数模型非常必要。本文基于KiK-net强震台网多个台站记录数据,主要开展了以下研究工作:(1)对KiK-net强震台网进行简单介绍;根据各台站的土层资料,依据我国《建筑抗震设计规范》(GB50011-2010)的建筑场地类别划分标准,进行台站场地类别的划分,并对所选地震记录数据进行校正处理。(2)对比分析同一次地震不同地震动分量的相干函数随频率的变化规律;探讨地表与地下两测点间的高度差、场地类别、震中距及震级对深度方向上地震动相干函数的影响。结果表明:同一次地震两水平分量相干函数随频率变化的规律类似,竖向分量与水平分量的相干函数的差异较大。相干函数随频率和测点高差的增加而减小。三类场地上的水平分量相干函数较一、二类场地上的水平分量相干函数随频率的增加而衰减的速度快。震中距在300km以内的记录的相干函数普遍要大于震中距大于300km的记录的相干函数。震级对相干函数的影响规律不明显。(3)对六组相干函数模型进行了沿深度方向地震动相干性描述的适用性分析。分析表明:不同场地类别上的地震动相干性不同,应使用不同的相干函数模型。三类场地的地震动相干性可用王招招的函数模型来反映,一、二类场地的地震动相干性则用Harichandran的相干函数模型更为适合。基于日本3.11大地震记录数据,拟合得到按震中距分段的相干函数模型参数值。
[Abstract]:Ground motion has strong temporal and spatial characteristics. For spatial variability, many scholars at home and abroad have discussed the coherence of ground motion between ground surface survey points, and set up a number of practical coherence function models, but the coherence between surface and underground survey points is seldom mentioned in the literature. With the large-scale development of underground engineering, it is very important to understand the coherence of ground motion along the depth for the seismic design and seismic safety of underground structures. The coherence analysis of ground motion along the direction of depth is carried out, and the effects of magnitude, epicentral distance, site category and height difference of measuring points on the coherence function are discussed. It is very necessary to establish the corresponding coherence function model. Based on the data recorded by several stations in KiK-net strong earthquake network, this paper mainly introduces the KiK-net strong earthquake network by following research work: 1) according to the soil layer data of each station, According to the classification standard of the building site category of our country < Code for Seismic Design of buildings], the classification of the site category of the station is carried out. The coherence function of different ground motion components of the same earthquake is compared and analyzed with frequency, and the height difference between ground surface and underground is discussed, and the type of site is also discussed. Effects of epicentral distance and magnitude on coherence function of ground motion in depth direction. The results show that the coherence function of the two horizontal components of the same earthquake varies with the frequency similar to that of the vertical component and the horizontal component. The coherence function decreases with the increase of the frequency and the height difference of the measured point. The coherence function of horizontal component on three kinds of sites is faster than that of one, and the coherence function of horizontal component on two kinds of sites decays faster with the increase of frequency. The coherence function of records with epicentral distance within 300km is generally larger than that of records with epicentral distance larger than 300km. The effect of magnitude on coherence function is not obvious.) the applicability of the coherence description of six sets of coherent function models along the depth of ground motion is analyzed. The results show that different coherence function models should be used for different types of ground motions. The coherence of ground motion of three kinds of sites can be reflected by Wang Zhaozhao's function model. First, the coherence of ground motion of the second kind of site is more suitable to use the coherence function model of Harichandran. Based on the data of Japan's 3.11 earthquake record, the parameter values of coherence function model based on the segment of epicentral distance are obtained.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P315

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