摘要
平潭海峡公铁两用大桥元洪航道桥为(132+196+532+196+132)m双塔钢桁混合梁斜拉桥。针对该桥防撞等级高、船撞力大、风流及波浪力大、防撞结构尺度大的特点,经比选,该桥最终采用钢套箱+V形防撞梁的组合式防撞体系。V形防撞梁的基本防撞机理为构造斜面削能、削力,为对其梁体刚度及张开角进行合理取值,采用有限元软件进行仿真分析,结果表明:梁体刚度对船舶和梁体的变形产生较大的影响;V形梁张开角取90°左右较为合适。根据分析结果,元洪航道桥V形防撞梁梁体采用了较船头略大的刚度,张开角取为90°。经计算,设置V形防撞梁后,该桥船舶撞击力峰值削减幅度达22.7%。
The Yuanhong ship channel bridge of the Pingtan Straits Rail-cum-Road Bridge is a double-pylon steel truss hybrid girder cable-stayed bridge with span arrangement（132＋196＋532＋196＋132）m.The bridge has the characteristics of the high anti-impact level,great ship collision force,strong wind and wave forces and large size anti-impact structure.Therefore,the bridge finally adopts the anti-impact system combining the steel box and V-shaped anti-impact beam after comparison of the different schemes.The basic mechanism of the V-shaped anti-impact beam is to build the inclined plane to weaken the energy and forces.The finite element software is used to analyze the impact between ship and beam to attain the reasonable values of the beam stiffness and opening angle.The results show that the beam stiffness has a great effect on the deformation of the ship and beam and the proper opening angle of the V-shaped beam is about 90°degree.According to the results of the analysis,for the Yuanhong ship channel bridge,the V-shaped anti-impact beam body that has the stiffness greater than that of the ship bows and that has the opening angle of 90°is selected and through the calculation,the weakening range of the peak value of the ship impact force reaches 22.7%.
作者
贾恩实
JIA En-shi(China Railway Major Bridge Reconnaissance ＆ Design Institute Co.,Ltd.,Wuhan 430056,Chin)
出处
《桥梁建设》
EI
CSCD
北大核心
2018年第3期90-94,共5页
Bridge Construction
关键词
桥梁防撞
V形防撞梁
防撞机理
梁体刚度
张开角
方案比选
构造设计
antHmpact of bridge
V-shaped ant--mpact beam
antHmpact mechanism
beam stiffness
opening angle
scheme comparison and selection
structural design
