本文關鍵詞： 橋梁工程 海洋環(huán)境 船橋碰撞 超長樁基礎 數(shù)值仿真 防撞設施　出處：《長安大學》2014年碩士論文　論文類型：學位論文

【摘要】：由于跨海大橋常處于通航繁忙的航道上，橋梁遭受船舶撞擊而導致?lián)p壞或倒塌的問題越來越突出。船橋碰撞的研究中常將橋墩及橋梁上部結構的響應作為重點，而對橋梁基礎的破壞情況關注較少。對于海洋環(huán)境高承臺樁基礎來說，當通航水位較低時，樁基礎更有可能受到船舶的直接撞擊而破壞。為確保橋梁基礎的運營安全，，開展海洋環(huán)境特大型橋梁超長樁基礎的船撞研究十分必要。 本文結合瑯岐閩江大橋實體工程，采用數(shù)值計算方法，建立船舶、防撞設施的實體簡化模型和樁土相互作用模型，對不同通航水位和撞擊位置時船舶撞擊橋梁樁基礎的過程進行仿真模擬，分析了船橋撞擊作用、船橋碰撞損傷狀況及船橋碰撞過程中能量轉換規(guī)律。研究得出通航水位的變化和撞擊點距承臺橫橋向中心線距離的變化對撞擊結果影響較大，橋梁防撞設計時應充分考慮二者的影響。船舶撞擊無防撞設施的樁基礎時會使樁基產(chǎn)生拉裂破壞，分析評價了有防撞設施的樁基礎的安全狀況，表明防撞設施的適用性較好。結合研究成果，提出橋梁防撞設施在設計時應將樁基的最大拉應力作為設計指標之一。 論文研究成果對確�，樶}江大橋基礎的運營安全起到了積極的指導作用，具有一定的理論和工程實用價值。
[Abstract]:Because the bridge is often located on the busy navigation channel, the damage or collapse of the bridge caused by ship impact is becoming more and more prominent. The response of pier and superstructure is often emphasized in the research of ship bridge collision. But less attention is paid to the damage of bridge foundation. For the high cap pile foundation in marine environment, when the navigable water level is low, the pile foundation is more likely to be damaged by the direct impact of the ship. It is necessary to study the ship collision of super long pile foundation of super large bridge in marine environment. In this paper, the simplified solid model and pile-soil interaction model of ship and collision prevention facilities are established by using numerical calculation method combined with the solid engineering of Langqi Minjiang River Bridge. The process of ship impact on bridge pile foundation under different navigable water level and impact position is simulated, and the impact action of ship and bridge is analyzed. The damage condition of ship and bridge and the law of energy conversion in the course of collision are studied. It is found that the change of navigable water level and the distance from the impact point to the centerline of the bridge at the cap have great influence on the impact result. In the design of bridge collision prevention, the influence of both factors should be taken into full consideration. When the ship impacts the pile foundation without anti-collision facilities, it will cause the pile foundation to crack and destroy. The safety condition of the pile foundation with the anti-collision device is analyzed and evaluated. It is suggested that the maximum tensile stress of pile foundation should be taken as one of the design indexes in the design of bridge anti-collision facilities. The research results of this paper play a positive guiding role in ensuring the operation safety of Luangqi Minjiang Bridge foundation, and have certain theoretical and engineering practical value.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U443.26

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