坝址地震动峰值及频谱特性研究
发布时间：2018-11-20 12:22
【摘要】：随着我国经济建设的快速发展,一批大型工程的建设成了我国经济发展的重要支柱,同时其安全性也成了我国科技工作者的重点关注对象。比如我国在中西部地区建设大型水坝,由于其平面尺寸大,且建在地震多发的中西部地区,因此大型水坝工程的抗震安全性和稳定性成了我们必须研究的课题。获得地震动观测数据是对结构物的地震危险性评估和建筑物抗震设防等研究的基础工作。本文以水库大坝坝址地震监测台阵获得的地震动数据为基础,进行了坝址地震动的峰值及频谱特性的研究工作,并获得了以下的研究成果:(1)利用坝址台阵记录时程对地震动峰值加速度和有效峰值加速度的特性进行了分析,并对加速度峰值相关性做了分析。(2)利用坝址台阵记录计算得到了地震动反应谱,分析了反应谱峰值和反应谱特征周期随周期、震级和震中距的变化,并对地震动反应谱峰值比和反应谱特征周期比随震级和震中距的变化规律进行了研究。(3)利用坝址台阵记录对傅氏谱的谱峰值和傅氏谱卓越频率随震级和震中距的变化规律进行了分析。通过对坝址地震动峰值及频谱特性的分析,以更好地了解坝址地震动的特性和分布规律,为大坝及其附属建筑物的抗震分析提供理论依据和数据基础。
[Abstract]:With the rapid development of China's economic construction, the construction of a number of large-scale projects has become an important pillar of China's economic development, and its security has also become the focus of our country's scientific and technological workers. For example, large dams in the central and western regions of China, because of its large plane size and earthquake prone in the central and western regions, so the seismic safety and stability of large dam engineering has become a subject we must study. The acquisition of ground motion observation data is the basic work of seismic risk assessment of structures and seismic fortification of buildings. Based on the seismic data obtained from the seismic monitoring array at the dam site of a reservoir, the peak value and spectral characteristics of the ground motion at the dam site are studied in this paper. The following research results are obtained: (1) the characteristics of peak acceleration and effective peak acceleration of ground motion are analyzed by using the time history recorded by the dam site array. The correlation of acceleration peak value is analyzed. (2) the response spectrum of ground motion is calculated by using the dam array records, and the variation of the peak value and characteristic period of response spectrum with period, magnitude and epicentral distance is analyzed. The variation of peak ratio of response spectrum and characteristic period ratio of response spectrum with magnitude and epicentral distance is studied. (3) the peak value of Fourier spectrum and the excellent frequency of Fourier spectrum with magnitude and earthquake magnitude are recorded by dam site array. The variation law of middle distance is analyzed. In order to better understand the characteristics and distribution of seismic ground motion at dam site, the peak and spectrum characteristics of ground motion at dam site are analyzed in order to provide theoretical basis and data basis for seismic analysis of dam and its affiliated buildings.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV312
本文编号：2344901
[Abstract]:With the rapid development of China's economic construction, the construction of a number of large-scale projects has become an important pillar of China's economic development, and its security has also become the focus of our country's scientific and technological workers. For example, large dams in the central and western regions of China, because of its large plane size and earthquake prone in the central and western regions, so the seismic safety and stability of large dam engineering has become a subject we must study. The acquisition of ground motion observation data is the basic work of seismic risk assessment of structures and seismic fortification of buildings. Based on the seismic data obtained from the seismic monitoring array at the dam site of a reservoir, the peak value and spectral characteristics of the ground motion at the dam site are studied in this paper. The following research results are obtained: (1) the characteristics of peak acceleration and effective peak acceleration of ground motion are analyzed by using the time history recorded by the dam site array. The correlation of acceleration peak value is analyzed. (2) the response spectrum of ground motion is calculated by using the dam array records, and the variation of the peak value and characteristic period of response spectrum with period, magnitude and epicentral distance is analyzed. The variation of peak ratio of response spectrum and characteristic period ratio of response spectrum with magnitude and epicentral distance is studied. (3) the peak value of Fourier spectrum and the excellent frequency of Fourier spectrum with magnitude and earthquake magnitude are recorded by dam site array. The variation law of middle distance is analyzed. In order to better understand the characteristics and distribution of seismic ground motion at dam site, the peak and spectrum characteristics of ground motion at dam site are analyzed in order to provide theoretical basis and data basis for seismic analysis of dam and its affiliated buildings.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV312
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