润扬长江公路大桥船撞数值模拟与复合材料防撞系统设计  

NUMERICAL SIMULATION AND STRUCTURAL DESIGN ON COMPOSITE ANTI-COLLISION SYSTEM ON RUNYANG CHANGJIANG RIVER HIGHWAY BRIDGE

作　　者：刘伟庆[1] 方海[1] 祝露[1] 庄勇[2] 周叮[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京210009 [2]中铁大桥勘测设计院集团有限公司,湖北武汉430034

出　　处：《玻璃钢／复合材料》2014年第12期5-12,共8页Fiber Reinforced Plastics/Composites

基　　金：江苏省高校自然科学研究重大项目(12KJA580002);江苏省六大人才高峰项目(2003JZ-006);江苏省"333高层次人才培养工程"科研项目

摘　　要：准确预测船撞作用下的桥墩受力值,对评估船桥碰撞后桥梁的安全性及进行合理防撞结构设计具有重要意义。由于船舶与桥梁均具有复杂的结构形式和受力行为,因此船撞力的准确计算目前主要借助于有限元数值模拟。本文围绕润扬长江大桥北叉斜拉桥展开防撞设计,首先应用经验公式预估船撞力,然后通过ANSYS/LS-DYNA非线性有限元软件模拟了3000t级船舶满载正撞、满载正桥向20°和满载侧桥向20°撞击北汊桥的下塔柱,归纳在各种工况下的碰撞能量和碰撞力时程曲线,进而与经验公式值进行对比;在此基础上,进行了桥梁防船撞系统的结构设计,并利用有限元软件分析对比桥墩是否设置防撞系统两种工况下所受的撞击力值。研究结果表明,各国经验公式计算结果相差较大,必须结合有限元仿真模拟计算船撞力;同时本文设计的自浮式D350型圆形截面复合材料防船撞系统具有大变形能力与良好的缓冲吸能效果,可以同时减轻桥墩与船舶的受损程度;有限元分析表明桥墩设置防撞系统后,所受的撞击力可下降34%。Precise prediction for mechanical behavior of the bridge pier under collision force is important to assess the safety of the bridge and conduct the reasonable anti-collision structural design. Due to the complicated structure and complex external force during the collision,an accurate simulation of the behaviors under the collision currently mainly depends on numerical method. This paper focuses on the Runyang cable-stayed bridge to expand anti-collision design,which is based on the nonlinear finite element of ANSYS / LS-DYNA to simulate the ship＇s bow section of 3000 t class hitting North Bridge tower column at front,axle to 20° of front and axle to 20° of side. Curves of collision force-period and absorbed-period on different working conditions are summarized. The data was compared with the empirical formula. On the basis of these curves and data,a structural design of anti-collision facility is conducted. Comparing the collision at the anti-collision facilities and the non-anticollision facilities by the finite element,the results show that the empirical formula has different results quitely in different countries,so it must be combined with the finite element to calculate collision force. At the same time,the anti-collision system of D350 has a large anti-collision deformation capacity and good energy absorption cushioning effect. It can weaken the impact force on bow itself and suffered pier. Compared with non-collision facilities,the impact force of pier can fall by 34%at setting anti-collision devices by numerical simulation.

关 键 词：船-桥碰撞 撞击力 复合材料 防撞设计 数值模拟 

分 类 号：TB332[一般工业技术—材料科学与工程] TB301