發(fā)布時間：2019-04-15 22:38

【摘要】：水陸交叉運輸系統(tǒng)的不斷發(fā)展推動著跨航道橋梁的建設，大量跨江橋梁的修建引起船橋碰撞風險大大提高，碰撞事故屢屢發(fā)生。因此，船橋碰撞問題對于航道中橋墩以及整橋的設計成為人們關注的焦點。近幾年，有限元技術的快速發(fā)展，數(shù)值仿真在船橋碰撞研究中被大量采用，同時配合試驗以驗證研究的正確性。本文正是在這種背景下進行了橋墩不同截面及高度和配筋率對船撞力的影響并配以 試驗方案，主要工作如下： ①調(diào)研統(tǒng)計長江流域上跨江橋梁與船舶特征，分別從橋梁類型、橋墩截面形狀、水位變化、船舶類型等因素對碰撞的影響，選取了矩形、圓形、圓端形、尖端形四種截面；175m水位；2000DWT和5000DWT的散裝貨船，為仿真分析提供依據(jù)。 ②通過不同截面形狀及高度的船橋碰撞數(shù)值仿真分析，得到圓端形雙柱墩為最耐撞的橋墩截面形狀。從船橋碰撞角度判斷橋墩高度小于40m為最優(yōu)高度。 ③截面配筋率對橋墩抗船撞力的分析研究。通過調(diào)研長江上部分橋墩截面配筋率，得到常用配筋率1.0%，在此基礎上分別增加和減少0.2%，對比分析配筋率對船撞力的影響，可知撞擊力僅提高或降低0.46%，為實際防撞工程的提供配筋參考。初步研究船橋碰撞中的綜合剛度，即同時考慮橋墩和船舶的剛度對船撞力的影響。 ④基于截面形狀的橋墩剛度船撞試驗方案。根據(jù)汽車碰撞原理模擬船橋碰撞，通過試驗結果驗證第三章的數(shù)值仿真結果。 最后，在總結本文研究內(nèi)容的基礎上，得出部分結論對橋梁設計和船橋碰撞驗算具有參考意義。
[Abstract]:The continuous development of land-water cross-transportation system promotes the construction of cross-channel bridges. The construction of a large number of cross-river bridges leads to a great increase in the collision risk of ships and bridges, and collision accidents occur frequently. Therefore, the collision between ships and bridges has become the focus of attention for the design of piers and whole bridges in the channel. In recent years, with the rapid development of finite element technology, numerical simulation has been widely used in the study of ship-bridge collision, and experiments are carried out to verify the correctness of the study. In this paper, the effects of different section, height and reinforcement ratio of piers on ship impact force are carried out. The main work is as follows: (1) the characteristics of bridges and ships across the Yangtze River basin are investigated and analyzed, and the results are as follows: (1) the characteristics of the bridge and ship in the Yangtze River basin are analyzed. According to the influence of bridge type, pier cross-section shape, water level change, ship type and other factors on collision, four kinds of cross-sections are selected: rectangle, round end shape and tip shape. 175m water level; 2000DWT and 5000DWT bulk carrier, provide the basis for simulation analysis. 2 through the numerical simulation analysis of ship bridge collision with different cross-section shape and height, it is found that the double-column pier with round end is the most anti-collision pier cross-section shape. From the angle of collision, the optimum height of pier is less than 40 m. Analysis and research on ship impact force of bridge piers by cross-section reinforcement ratio. By investigating the reinforcement ratio of some piers on the Yangtze River, it is found that the reinforcement ratio in common use is 1.0%. On this basis, the reinforcement ratio increases and decreases 0.2% respectively. By comparing and analyzing the influence of reinforcement ratio on the ship impact force, it can be seen that the impact force only increases or decreases by 0.46%. For the actual anti-collision project to provide reinforcement reference. In this paper, the comprehensive stiffness of ship bridge in collision is studied, that is to say, the influence of pier and ship stiffness on ship impact force is taken into account at the same time. (4) the bridge pier stiffness ship collision test scheme based on cross-section shape. According to the collision principle of automobile, the ship bridge collision is simulated, and the numerical simulation results of chapter 3 are verified by the test results. Finally, on the basis of summarizing the research contents of this paper, some conclusions have reference significance for bridge design and ship-bridge collision checking.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U443.22

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本文編號：2458548