桥梁船撞动力响应数值模拟研究

发布时间：2018-04-20 19:46

本文选题：船桥碰撞 + 数值模拟　；参考：《重庆交通大学》2015年硕士论文

【摘要】：随着国内交通建设的不断发展,跨越江河的桥梁越来越多。这类桥梁,存在受船舶撞击而垮塌的危险。所以,对于跨航道的桥梁的设计,要考虑桥梁受到撞击时的承载能力。对于桥梁设计船撞力,普遍是套用规范给出的半经验公式。但规范公式得到的设计船撞力与实际情况相差较大。近年来,仿真分析的方法在船撞桥问题中得到了较多的应用。本文研究的目的主要是通过船桥碰撞仿真模拟,可以重现船舶与桥梁的接触、碰撞力、损伤变形和能量吸收的时间历程,以此为参考能较为准确的评估桥梁在遭受船舶撞击时的安全性。本文所做的研究工作及相应成果如下:1、通过查阅文献,总结前人在桥梁防撞理念、桥梁船撞风险概率、船桥碰撞机理以及船撞桥仿真计算方面的研究现状,指出目前船撞力计算方面存在的不足。2、分别通过国内外最常用的5个规范公式计算湛江海湾大桥设计防撞力,并对五个规范公式进行比较。3、通过ABAQUS软件建立了精确的有限元桥墩模型及船舶模型,并通过设计的物理模型试验,验证了ABAQUS软件对此船桥碰撞模拟的得到的结果较为准确。4、采用ABAQUS/EXPLICIT模块,分别进行了七种不同工况下的船桥碰撞模拟,得到相应的时程曲线,分析撞击速度、船舶吨位、碰撞角度对船桥碰撞中动力响应的影响。①碰撞力峰值的大小与碰撞速度呈线性关系,平均碰撞力的大小与船舶质量的平方根呈线性关系。碰撞角度对船撞力的影响归根到底是船舶在法向及切向方向上的速度分量的影响。②碰撞过程中船舶动能大部分转化为船舶变形能,少部分为桥墩塑性变形损耗。速度越大,质量越大,船舶变形能占总能量越大,动能转化为内能的比例越小。
[Abstract]:With the development of domestic traffic construction, there are more and more bridges across rivers. Such bridges are in danger of collapsing as a result of a ship's impact. Therefore, the bearing capacity of the bridge under impact should be considered in the design of the bridge across the channel. For the collision force of bridge design ship, it is generally the semi-empirical formula given in the applicable code. However, the collision force of the design ship obtained by the standard formula is quite different from the actual situation. In recent years, the method of simulation analysis has been widely used in the problem of ship collision bridge. The purpose of this paper is to reproduce the time course of ship and bridge contact, collision force, damage deformation and energy absorption through the simulation of ship-bridge collision. It can be used as a reference to evaluate the safety of a bridge when it is hit by a ship. The research work and corresponding results in this paper are as follows: 1. Through consulting the literature, the paper summarizes the current research situation of bridge collision prevention concept, bridge ship collision risk probability, ship bridge collision mechanism and ship collision simulation calculation. This paper points out the deficiency of ship collision force calculation at present, and calculates the design collision resistance of Zhanjiang Bay Bridge through the five most commonly used formulas at home and abroad. By comparing the five standard formulas. 3, the accurate finite element pier model and ship model are established by ABAQUS software, and the physical model test is carried out. The results obtained by ABAQUS software are verified to be more accurate. 4. By using ABAQUS/EXPLICIT module, the ship bridge collision simulation under seven different working conditions is carried out, and the corresponding time history curve is obtained, and the impact velocity and ship tonnage are analyzed. Influence of collision angle on dynamic response of ship and bridge collision. 1 the peak value of collision force is linearly related to collision velocity, and the average collision force is linearly related to the square root of ship mass. The impact of collision angle on ship collision force is, in the final analysis, the influence of velocity component in normal and tangential direction of ship. 2. During collision, the kinetic energy of ship is mostly converted into ship deformation energy, and a few part is plastic deformation loss of bridge pier. The larger the velocity, the bigger the mass, the larger the ship deformation energy is, and the smaller the proportion of kinetic energy to internal energy is.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U447

【参考文献】