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  本文選題：船橋碰撞　切入點：動力響應(yīng)　出處：《南京航空航天大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：船橋碰撞問題涉及的主要對象有船舶、橋梁、土體。船撞作用下,群樁基礎(chǔ)會產(chǎn)生復(fù)雜的動力響應(yīng)。本文采用模型試驗和數(shù)值模擬相結(jié)合的方法研究船橋相撞時,與碰撞相關(guān)聯(lián)物體的特性對群樁動力響應(yīng)的影響規(guī)律。模型試驗中,制作模型相似比為1:50的船、群樁基礎(chǔ)及承臺模型,在試驗土槽中放置群樁基礎(chǔ),模擬船與承臺的碰撞,并采集了位移、加速度等相關(guān)動態(tài)響應(yīng)數(shù)據(jù)。采用有限元方法,建立船舶、群樁和土體模型,其中船舶采用分層殼體單元建模,群樁基礎(chǔ)和土體采用實體單元建模,模擬船與承臺的碰撞過程。分析了船噸位、船速、樁間距、露出地面樁長、樁徑、上部荷載、群樁數(shù)量、撞擊角度、撞擊位置、土的動彈性模量等因素變化對群樁基礎(chǔ)動力響應(yīng)的影響。并將試驗結(jié)果和數(shù)值模擬結(jié)果進行對比分析。研究結(jié)果表明船噸位、船速對最大船撞力、最大承臺加速度和最大承臺位移影響較大;樁間距對動力響應(yīng)影響較小;露出地面樁長、樁徑、上部荷載、群樁數(shù)量對最大承臺加速度和最大承臺位移影響較大,但對最大船撞力影響較小;撞擊角度對碰撞持續(xù)的時間、最大承臺平均位移和最大承臺偏轉(zhuǎn)角度有影響;撞擊位置對船撞力、承臺加速度、承臺平均位移影響較小,對最大承臺偏轉(zhuǎn)角度影響較大;土的動彈性模量對最大承臺加速度和最大承臺位移影響較大,但對最大船撞力影響較小。
[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.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U447;U443.15
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本文編號：1600137