船撞作用下群桩基础动力响应研究

发布时间：2018-03-11 22:12

  本文选题：船桥碰撞　切入点：动力响应　出处：《南京航空航天大学》2014年硕士论文　论文类型：学位论文

【摘要】：船桥碰撞问题涉及的主要对象有船舶、桥梁、土体。船撞作用下,群桩基础会产生复杂的动力响应。本文采用模型试验和数值模拟相结合的方法研究船桥相撞时,与碰撞相关联物体的特性对群桩动力响应的影响规律。模型试验中,制作模型相似比为1:50的船、群桩基础及承台模型,在试验土槽中放置群桩基础,模拟船与承台的碰撞,并采集了位移、加速度等相关动态响应数据。采用有限元方法,建立船舶、群桩和土体模型,其中船舶采用分层壳体单元建模,群桩基础和土体采用实体单元建模,模拟船与承台的碰撞过程。分析了船吨位、船速、桩间距、露出地面桩长、桩径、上部荷载、群桩数量、撞击角度、撞击位置、土的动弹性模量等因素变化对群桩基础动力响应的影响。并将试验结果和数值模拟结果进行对比分析。研究结果表明船吨位、船速对最大船撞力、最大承台加速度和最大承台位移影响较大;桩间距对动力响应影响较小;露出地面桩长、桩径、上部荷载、群桩数量对最大承台加速度和最大承台位移影响较大,但对最大船撞力影响较小;撞击角度对碰撞持续的时间、最大承台平均位移和最大承台偏转角度有影响;撞击位置对船撞力、承台加速度、承台平均位移影响较小,对最大承台偏转角度影响较大;土的动弹性模量对最大承台加速度和最大承台位移影响较大,但对最大船撞力影响较小。
[Abstract]:The main objects involved in ship-bridge collision are ship, bridge and soil. Under the action of ship collision, pile group foundation will produce complex dynamic response. In this paper, the method of model test and numerical simulation is used to study the collision of ship bridge. The effect of the characteristics of objects associated with collision on the dynamic response of pile groups. In the model test, the ship, pile group foundation and cap model with a similar model ratio of 1:50 are made, and the pile group foundation is placed in the test soil slot to simulate the collision between the ship and the cap. The dynamic response data such as displacement, acceleration and so on are collected. The ship, pile group and soil are modeled by finite element method, in which the ship is modeled by stratified shell element, the foundation of pile group and soil are modeled by solid element. The collision process between ship and cap is simulated. The ship tonnage, ship speed, pile spacing, exposed ground pile length, pile diameter, upper load, pile group number, impact angle, impact position are analyzed. The influence of dynamic elastic modulus of soil on the dynamic response of pile group foundation is analyzed. The experimental results are compared with the numerical simulation results. The results show that the ship's tonnage, ship speed and maximum ship collision force, The effects of maximum cap acceleration and maximum cap displacement are great, the influence of pile spacing on dynamic response is small, and the maximum pile length, pile diameter, upper load and pile group number have great influence on the maximum cap acceleration and maximum cap displacement. However, the impact angle has little effect on the collision duration, the maximum cap average displacement and the maximum cap deflection angle, and the impact position has little effect on the ship collision force, cap acceleration, and cap average displacement. The dynamic elastic modulus of soil has great influence on the maximum cap acceleration and the maximum cap displacement, but has little effect on the maximum ship collision force.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U447;U443.15
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本文编号：1600137