Dynamic Demand of Bridge Structure Subjected to Vessel Impact Using Simplified Interaction Model
Dynamic Demand of Bridge Structure Subjected to Vessel Impact Using Simplified Interaction Model
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DOI：
10.1061/(asce)be.1943-5592.0000139
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发表时间：
2011
影响因子：
3.6
通讯作者：
W. Fan;W. Yuan;Zhi Yang;Q. Fan
中科院分区：
文献类型：
--
作者：
W. Fan;W. Yuan;Zhi Yang;Q. Fan
使用通用有限元代码评估动态需求不仅效率低下，而且由于船桥碰撞复杂的非线性动力学行为，在实际应用中不被接受。本文提出了一种替代的简化相互作用模型来有效评估船舶撞击下桥梁结构的动态需求。在该方法中，船舶运动被视为单自由度运动，船首由连接到桥梁结构的非线性弹簧单元（仅压缩）建模。采用准静态方法获得了冲击力与船艏压溃深度之间的非线性静力关系，并讨论了承台高度的影响。基于两种不同的方法，考虑了应变率效应对冲击力的影响，以获得相应的动态挤压曲线，该曲线是为所提出的相互作用模型开发的。结果表明，使用简化的相互作用模型得到的桥梁结构动力响应与通用碰撞分析吻合良好，且计算效率明显提高。
Assessing the dynamic demand using general-purpose finite-element codes is not only low in efficiency, but also unaccepted in practical application due to the complicated nonlinear dynamical behaviors of vessel-bridge collision. In this paper, an alternative simplified interaction model is presented to evaluate the dynamic demand of bridge structure under vessel impact efficiently. In this method, ship motion is regarded as the motion of single degree of freedom, and ship-bow is modeled by a nonlinear spring element (only compression) connected to bridge structure. A quasi-static method is employed to obtain the nonlinear static relationships between impact forces and crush depths of ship-bow, and the effect of the height of pile cap is discussed. Based on two different approaches, the influence of strain-rate effect on impact force is taken into account to obtain the corresponding dynamic crush curves, which are developed for the proposed interaction model. Results show that the dynamic responses of bridge structures using the simplified interaction models are in good agreement with the general-purpose collision analyses, while the former computation efficiency is improved obviously.