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摘要
Researchers and designers will more prefer to learn the time-domain characterizations of ground motions when selecting special ground motions such as pulse-like ground motions or harmonic like ground motions. In consideration of that there is no mature method to investigate ground motion characterization in time-domain, visual identification is always used. But there is no quantitative index used for describing ground motion characterization in the process of visual identification, so subjectivity errors caused by human are often involved. Ground motion time-domain characterization mainly indicates the variation of vibration period and the intensity of ground motions with time history. If there is a quantitative method to describe the variation, then the subjectivity errors can be eliminated. To solve the problem, this article proposed a simple and effective method which is named as Zero Velocity Point Method (ZVPM) to analyze the time-domain characterizations of ground motions. This method could quantitatively analyze the variation of vibration period and the intensity of ground motions with time history. And the equivalent velocity time-history can be obtained by the predefined amplitude parameter, period parameter and phase parameter. Considering the special destructive effects of pulse-like ground motions to structures, this article analyzed 24 typical pulse-like ground motions and proposed a simple method to calculate the pulse period based on Zero Velocity Point Method. In order to quickly obtain the equivalent velocity pulse of the ground motions utilized in this paper for engineering designers, the arithmetic expression of equivalent velocity pulse for each ground motion is given out.
- 出版日期2016-6
- 单位哈尔滨工业大学
