摘要
在获得了重力式弧立墩柱短期稳定性统计特征的基础上,才能解决其在一定使用期限内的抗滑、抗倾可靠性问题。由于描述短峰波作用下墩柱稳定性的状态函数是非线性的,故很难从理论上导出其统计特性的解析形式。本文用数值随机模拟的方法,对状态函数进行统计分析。采用该模拟方法可对重力式墩柱的短期可靠性直接做出估计,也可由此进行使用寿命期内的可靠性分析。此外,对圆形墩柱给出了模拟分析的实例。
This paper presents a method for probabilistic estimation of the short term stability of offshore gravity cylinders. Random numerical simulation is used to obtain the time series of state function of stability against sliding and overturning, because the functions are nonlinear and their statistical properties can not be inferred directly from theory. Then statistical properties of the functions are calculated based on the time series. Horizontal and vertical wave forces and their moments are included in the terms of state functions. By using this method we can directly estimate the short term reliability properties of the structures and further approach the long term problems. For circular cylinder under short-crested waves, examples of simulation and analysis are given in this paper.
