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采用理想化的压力—时间曲线模拟爆炸冲击荷载,压力—时间曲线为简化的三角形荷载形式。考虑应变率效应对钢材的影响,应用LS-DYNA有限元分析软件,对导管架海洋平台在爆炸冲击荷载作用下的动力响应进行数值模拟和分析,得到了不同峰值爆炸荷载作用下,海洋平台结构上层甲板、中层甲板和立面结构重要节点的动力响应时程曲线。结果表明:上层甲板和中层甲板节点竖向位移的绝对值随着爆炸荷载峰值压力的增大而增大,当爆炸荷载峰值压力为20～70kPa时,节点区域内均处于弹性状态,当爆炸荷载峰值压力为80kPa时,节点区域内进入了塑性状态。立面平台节点的水平位移随着爆炸荷载峰值压力的增大而增大,当爆炸荷载峰值压力为20～80kPa时,节点区域内进入塑性状态。
The idealized pressure-time curve is used to simulate the impact load of the explosion, and the pressure-time curve is in the form of a simplified triangular load. Considering the influence of strain rate effect on steel, the dynamic response of jacket offshore platform under explosive impact load was numerically simulated and analyzed by using LS-DYNA software. The results of different peak explosion loadings showed that the structure of offshore platform Dynamic Response Time History Curve of Important Nodes of Upper Deck, Middle Deck and Facade Structure. The results show that the absolute value of the vertical displacement of the upper and middle deck nodes increases with the increase of the peak pressure of explosion load. When the peak load of explosion load is 20 ~ 70kPa, When the peak pressure is 80kPa, the plastic state is entered in the node area. The horizontal displacement of the elevation platform node increases with the increase of peak pressure of explosion load. When the peak pressure of explosion load is 20 ~ 80kPa, the horizontal displacement of the platform platform enters the plastic state.