【摘要】：對(duì)各種橋梁坍塌事故統(tǒng)計(jì)分析表明,船舶撞毀橋梁是導(dǎo)致橋梁坍塌的主要原因之一,分析橋梁船撞事故原由,研究船撞事故的發(fā)生規(guī)律對(duì)橋梁防撞設(shè)計(jì)有重要啟示作用。同時(shí),分析指出,橋墩是千米級(jí)斜拉橋防撞設(shè)計(jì)時(shí)的重點(diǎn)考慮對(duì)象。近些年來,得益于計(jì)算機(jī)技術(shù)的飛躍發(fā)展,有限元法為船橋碰撞問題提供了有效并可靠的分析途徑,從而從眾多的船橋碰撞研究方法中脫穎而出。為了尋找更為合理高效的有限元數(shù)值模擬方法,探究船橋碰撞過程的影響因素,本文以安徽省望東長(zhǎng)江大橋?yàn)楣こ瘫尘?精確建立船舶與橋梁實(shí)體模型后,運(yùn)用LS-DYNA進(jìn)行數(shù)值模擬分析。本文主要研究?jī)?nèi)容如下:(1)為了研究不同的樁土相互作用模型對(duì)船橋碰撞結(jié)果的影響,本文采用了“固定端”模型、p-y彈簧模型和有限域土體模型來模擬樁土間相互作用。并且,在這三種模型的基礎(chǔ)上,借助LS-DYNA軟件對(duì)船橋碰撞過程進(jìn)行了數(shù)值模擬。通過對(duì)比不同樁土相互作用模型的數(shù)值模擬結(jié)果可以看出,動(dòng)態(tài)有限元方法能夠有效模擬船橋碰撞問題。(2)本文綜合考慮了船舶與主塔的彈塑性反應(yīng),精確建立10000t帶球鼻艏船舶與望東長(zhǎng)江大橋望江側(cè)主塔有限元模型,對(duì)船橋碰撞過程的影響因素進(jìn)行數(shù)值模擬,包括水位線變化、不同船舶速度以及船舶撞擊方向的改變,研究碰撞過程中能量的轉(zhuǎn)化等計(jì)算結(jié)果。(3)綜合考慮拉索力、橋梁結(jié)構(gòu)及樁土相互作用后,本文建立了望東長(zhǎng)江大橋整橋有限元模型,數(shù)值模擬非線性船橋碰撞過程,獲得了船橋碰撞力、船艏與群樁基礎(chǔ)變形等計(jì)算結(jié)果。探討在船橋碰撞過程中,只建立橋梁主塔模型,對(duì)其余部位進(jìn)行相應(yīng)的簡(jiǎn)化與忽略,與建立整橋模型有限元數(shù)值模擬結(jié)果的差異,證實(shí)以單座主塔模型替代整橋建模的合理性。
[Abstract]:Statistical analysis of various bridge collapse accidents shows that ship collision is one of the main causes of bridge collapse. It is important for bridge collision design to analyze the causes of bridge collision accidents and to study the occurrence law of ship collision accidents. At the same time, it is pointed out that pier is the important object of collision prevention design of kilometer-scale cable-stayed bridge. In recent years, thanks to the rapid development of computer technology, finite element method (FEM) provides an effective and reliable way to analyze the collision problem of ship and bridge, and thus stands out from many research methods of ship-bridge collision. In order to find a more reasonable and efficient finite element numerical simulation method and explore the factors influencing the collision process of ship and bridge, this paper takes Wangdong Yangtze River Bridge in Anhui Province as the engineering background, and establishes the entity model of ship and bridge accurately. LS-DYNA is used to carry out numerical simulation and analysis. The main contents of this paper are as follows: (1) in order to study the influence of different pile-soil interaction models on the collision results of ship and bridge, the "fixed end" model is adopted in this paper. The p-y spring model and the finite field soil model are used to simulate the pile-soil interaction. On the basis of these three models, the collision process of ship and bridge is simulated with LS-DYNA software. By comparing the numerical simulation results of different pile-soil interaction models, it can be seen that the dynamic finite element method can effectively simulate the ship-bridge collision problem. (2) the elastoplastic response of the ship to the main tower is considered comprehensively in this paper. The finite element model of 10000t spherical nose bow ship and Wangjiang main tower of Wangdong Yangtze River Bridge is established accurately. The factors influencing the collision process of the ship and bridge are numerically simulated, including the variation of water level, the change of ship velocity and the direction of ship impact. The calculation results of energy conversion during collision are studied. (3) after considering the interaction of cable force, bridge structure and pile-soil, the finite element model of the whole bridge of Wangdong Yangtze River Bridge is established, and the nonlinear ship bridge collision process is numerically simulated. The calculation results of collision force of ship and bridge, deformation of ship bow and pile group foundation are obtained. In the course of ship-bridge collision, only the main tower model of the bridge is established, and the other parts are simplified and ignored accordingly. The difference between the finite element numerical simulation results of the whole bridge model and that of the whole bridge model is discussed, and the rationality of replacing the whole bridge model with the single-seat main tower model is proved.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U443.15;U447

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 田力;黃飛;;考慮流體效應(yīng)的船-橋碰撞數(shù)值模擬法研究[J];工程力學(xué);2015年08期

2 潘晉;姜偉;許明財(cái);;散貨船與橋墩碰撞力的經(jīng)驗(yàn)公式與數(shù)值模擬對(duì)比研究[J];振動(dòng)與沖擊;2012年19期

3 ;A nonlinear dynamic macro-element for demand assessment of bridge substructures subjected to ship collision[J];Journal of Zhejiang University-Science A(Applied Physics & Engineering);2011年11期

4 樊偉;袁萬城;楊智;樊啟武;;高樁承臺(tái)橋梁船撞動(dòng)力需求的時(shí)程分析法[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年12期

5 黃寶寶;劉偉慶;方海;莊勇;張廣;;銅陵長(zhǎng)江公鐵兩用大橋主橋塔船舶撞擊力研究[J];中外公路;2010年05期

6 樊偉;袁萬城;李麗平;楊智;;千米級(jí)斜拉橋船撞動(dòng)力響應(yīng)分析實(shí)用方法研究[J];武漢理工大學(xué)學(xué)報(bào)(交通科學(xué)與工程版);2010年04期

7 李耀;李和平;巫緒濤;;混凝土HJC動(dòng)態(tài)本構(gòu)模型的研究[J];合肥工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年08期

8 ;Calculation method of ship collision force on bridge using artificial neural network[J];Journal of Zhejiang University(Science A:An International Applied Physics & Engineering Journal);2008年05期

9 胡志強(qiáng),顧永寧,高震,李雅寧;基于非線性數(shù)值模擬的船橋碰撞力快速估算[J];工程力學(xué);2005年03期

10 劉建成,顧永寧;基于整船整橋模型的船橋碰撞數(shù)值仿真[J];工程力學(xué);2003年05期

相關(guān)碩士學(xué)位論文 前5條

1 陳濤;船舶與大跨度斜拉橋碰撞數(shù)值仿真及防撞設(shè)施分析[D];合肥工業(yè)大學(xué);2016年

2 左玉強(qiáng);船舶撞擊橋墩有限元數(shù)值模擬及防撞裝置設(shè)計(jì)研究[D];合肥工業(yè)大學(xué);2016年

3 徐春林;船舶撞擊橋梁的理論分析與試驗(yàn)研究[D];南京航空航天大學(xué);2011年

4 徐中山;船橋碰撞動(dòng)力響應(yīng)研究[D];華南理工大學(xué);2010年

5 陳誠(chéng);橋梁設(shè)計(jì)船撞力及損傷狀態(tài)仿真研究[D];同濟(jì)大學(xué);2006年

，

本文編號(hào)：2375937