海洋环境特大型桥梁超长桩基础船撞数值仿真试验研究

发布时间：2018-02-12 11:02

本文关键词： 桥梁工程海洋环境船桥碰撞超长桩基础数值仿真防撞设施　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：由于跨海大桥常处于通航繁忙的航道上，桥梁遭受船舶撞击而导致损坏或倒塌的问题越来越突出。船桥碰撞的研究中常将桥墩及桥梁上部结构的响应作为重点，而对桥梁基础的破坏情况关注较少。对于海洋环境高承台桩基础来说，当通航水位较低时，桩基础更有可能受到船舶的直接撞击而破坏。为确保桥梁基础的运营安全，，开展海洋环境特大型桥梁超长桩基础的船撞研究十分必要。本文结合琅岐闽江大桥实体工程，采用数值计算方法，建立船舶、防撞设施的实体简化模型和桩土相互作用模型，对不同通航水位和撞击位置时船舶撞击桥梁桩基础的过程进行仿真模拟，分析了船桥撞击作用、船桥碰撞损伤状况及船桥碰撞过程中能量转换规律。研究得出通航水位的变化和撞击点距承台横桥向中心线距离的变化对撞击结果影响较大，桥梁防撞设计时应充分考虑二者的影响。船舶撞击无防撞设施的桩基础时会使桩基产生拉裂破坏，分析评价了有防撞设施的桩基础的安全状况，表明防撞设施的适用性较好。结合研究成果，提出桥梁防撞设施在设计时应将桩基的最大拉应力作为设计指标之一。论文研究成果对确保琅岐闽江大桥基础的运营安全起到了积极的指导作用，具有一定的理论和工程实用价值。
[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.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.26

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