近场强震记录基线校正实验系统研究

发布时间：2018-01-06 09:01

本文关键词：近场强震记录基线校正实验系统研究　出处：《防灾科技学院》2016年硕士论文　论文类型：学位论文

【摘要】：近场强地震动观测记录因多种原因影响,一般会存在基线漂移问题,校正方法不当往往会产生与实际物理过程相悖的结论或有效地震动信息消失等问题,现有研究成果虽然提出一系列的校正方法,但因方法存在较大的主观性和不确定性,导致该问题一直还未很好的解决。本文针对这一问题在现有的研究基础上开展了进一步的研究。本文对近场强震动记录基线校正方法研究的发展历程和现状进行了总结,分析了基线漂移产生的原因,归纳了目前针对基线漂移提出的基线校正方法,并指出了现有的基线校正方法中存在的问题。为了对振动位移进行直接量测,本文基于动态视频图像处理技术,在MATLAB GUI平台下开发了基于标识点自动识别的非接触式动态位移测量系统;并通过验证试验探讨了该测量系统的测量精度,并进行了不同标识方案和摄像帧率对测试精度的影响分析,最终确定现有条件下用于振动位移直接测量的优化参数测试方案。最后,根据近场强震动观测实际情况,提出一种新的振动台实验方案用于开展强震动观测加速度计旋转、倾斜和发生永久位移情况下的数据可靠性的正演式实验分析。实验分析表明:在一维平动加载情况下,旋转一定水平转角测得强地震动与正确安装加速度测得的加载方向记录差别可通过数学理论较好的校正过来,倾斜一定角度测得强地震动与正确安装加速度测得的加载方向记录差别也可通过数学理论较好的校正过来;在一维平动加载情况下,强震动加速度记录通过积分校正后得到的永久位移值和位移过程与真实的永久位移值和位移过程可以做到基本符合。最后本文指出后续相关研究的方向和思路。
[Abstract]:The near field strong ground motion observation records usually have the problem of baseline drift due to many reasons. Improper correction methods often produce conclusions contrary to the actual physical process or the disappearance of effective ground motion information and so on. Although a series of correction methods have been proposed in the present research results, there is a great deal of subjectivity and uncertainty in the methods. As a result, the problem has not been solved well. This paper has carried out further research on this problem on the basis of existing research. This paper has carried out the development and present situation of baseline correction methods for near-field intensity seismic records. Summarized. The causes of baseline drift are analyzed, the current baseline correction methods for baseline drift are summarized, and the problems existing in the existing baseline correction methods are pointed out in order to measure vibration displacement directly. Based on dynamic video image processing technology, a non-contact dynamic displacement measurement system based on automatic identification of identification points is developed in MATLAB GUI platform. The accuracy of the measurement system is discussed through the verification test, and the influence of different marking schemes and frame rate on the measurement accuracy is analyzed. Finally, the optimal parameter measurement scheme for direct vibration displacement measurement under existing conditions is determined. Finally, according to the actual situation of near-field intensity vibration observation. A new shaking table experimental scheme is proposed for the rotation of accelerometers with strong vibration observation. The forward experimental analysis of the reliability of the data in the case of tilt and permanent displacement. The experimental results show that: in the case of one-dimensional translational loading. The difference between the strong ground motion measured by rotating a certain horizontal rotation angle and the loading direction record measured by correct installation acceleration can be well corrected by mathematical theory. The difference between the strong ground motion measured at a certain angle of tilt and the loading direction record measured by the correct installation acceleration can also be corrected by mathematical theory. In the case of one-dimensional translational loading. The permanent displacement value and displacement process obtained by the integral correction of the strong vibration acceleration record can be basically consistent with the real permanent displacement value and displacement process. Finally, this paper points out the direction and ideas of the subsequent research.
【学位授予单位】：防灾科技学院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P315.7

【相似文献】