导流墙对大跨度桥梁防撞设计的影响研究

Study on the Influence of the Diversion Wall on the Anti-collision Design of Long Span

为研究导流墙结构对大跨度桥梁防船撞设计的影响,以广州省某跨越Ⅲ级航道的大跨度桥梁为研究对象,采用非线性分析软件LS-DYNA对船舶撞击裸墩及撞击导流墙的撞击力进行分析,并采用MIDAS/CIVIL对桥墩及导流墙结构的自身抗撞能力进行计算,提出由桥墩抗力与船撞力快速评价桥墩抗撞设计安全性的方法,分析了导流墙对船舶撞击力和桥墩自身抗撞能力的影响.结果表明,对于该桥梁结构,导流墙结构隔离船舶撞击墩柱,可减小9.5%的船舶撞击力,导流墙发生弯曲变形后撞击力传递到墩柱,与船舶直接撞击桥墩时相比墩身受力减少了73.2%,设置导流墙结构可分别提高桥墩横桥向和纵桥向抗撞设计安全系数1.6和2.7倍.

In order to study the influence of the diversion wall on the anti-collision design of long span bridges,a long-span bridge crossing Class III channel in Guangzhou Province has been taken as the research object in this paper.The collision forces of ship-pier collision and ship-diversion wall collision were analyzed individually by using nonlinear analysis software LS-DYNA.The impact resistances of piers and diversion wall were calculated by using MIDAS/CIVIL software.The rapid security evaluation method of the design by bridge resistance and ship collision force was put forward.The results show that,the diversion wall has the effect of the isolation protection pier from the collision.The impact force of ship and diversion wall could be reduced by 9.5%.The impact force was passed to the pier after the diversion wall bending deformation occurred,and the force of pier reduced by 73.2%compared with the result of ship directly impacting the pier.Meanwhile,diversion wall structure could improve the vertical and horizontal safety coefficient of the anti-collision design 1.6 and 2.7 times respectively.