本文選題：船橋碰撞 + 數(shù)值模擬��； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：隨著國內(nèi)交通建設(shè)的不斷發(fā)展,跨越江河的橋梁越來越多。這類橋梁,存在受船舶撞擊而垮塌的危險(xiǎn)。所以,對于跨航道的橋梁的設(shè)計(jì),要考慮橋梁受到撞擊時(shí)的承載能力。對于橋梁設(shè)計(jì)船撞力,普遍是套用規(guī)范給出的半經(jīng)驗(yàn)公式。但規(guī)范公式得到的設(shè)計(jì)船撞力與實(shí)際情況相差較大。近年來,仿真分析的方法在船撞橋問題中得到了較多的應(yīng)用。本文研究的目的主要是通過船橋碰撞仿真模擬,可以重現(xiàn)船舶與橋梁的接觸、碰撞力、損傷變形和能量吸收的時(shí)間歷程,以此為參考能較為準(zhǔn)確的評估橋梁在遭受船舶撞擊時(shí)的安全性。本文所做的研究工作及相應(yīng)成果如下:1、通過查閱文獻(xiàn),總結(jié)前人在橋梁防撞理念、橋梁船撞風(fēng)險(xiǎn)概率、船橋碰撞機(jī)理以及船撞橋仿真計(jì)算方面的研究現(xiàn)狀,指出目前船撞力計(jì)算方面存在的不足。2、分別通過國內(nèi)外最常用的5個(gè)規(guī)范公式計(jì)算湛江海灣大橋設(shè)計(jì)防撞力,并對五個(gè)規(guī)范公式進(jìn)行比較。3、通過ABAQUS軟件建立了精確的有限元橋墩模型及船舶模型,并通過設(shè)計(jì)的物理模型試驗(yàn),驗(yàn)證了ABAQUS軟件對此船橋碰撞模擬的得到的結(jié)果較為準(zhǔn)確。4、采用ABAQUS/EXPLICIT模塊,分別進(jìn)行了七種不同工況下的船橋碰撞模擬,得到相應(yīng)的時(shí)程曲線,分析撞擊速度、船舶噸位、碰撞角度對船橋碰撞中動(dòng)力響應(yīng)的影響。①碰撞力峰值的大小與碰撞速度呈線性關(guān)系,平均碰撞力的大小與船舶質(zhì)量的平方根呈線性關(guān)系。碰撞角度對船撞力的影響歸根到底是船舶在法向及切向方向上的速度分量的影響。②碰撞過程中船舶動(dòng)能大部分轉(zhuǎn)化為船舶變形能,少部分為橋墩塑性變形損耗。速度越大,質(zhì)量越大,船舶變形能占總能量越大,動(dòng)能轉(zhuǎn)化為內(nèi)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.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441.3;U447

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本文編號：1779172