角钢支承钢管架防撞设施的性能分析

Analysis of anti-collision equipment of steel pipe truss supported by steel angles

为猎德大桥9#墩设计了角钢支承钢管架防撞设施.根据显式瞬态非线性有限元分析技术,考虑了碰撞中的材料非线性、几何非线性、接触非线性、运动非线性以及它们之间相互耦合的特性,用ANSYS/LS-DYNA软件建立了包含9#墩防撞设施和碰撞船的有限元数值仿真模型.仿真结果反映了角钢支承钢管架防撞结构的基本性能,碰撞的整个时间历程得以全面的模拟实现.获得了角钢和钢管不同参数变化的情况下防撞设施撞深、撞击力及吸能等参数的变化情况.从总体上说,撞深随着撞击力的增加而增加,防撞装置在抵抗撞击时,钢管起到主要吸能的作用,角钢的吸能值约为钢管的1/5.在设计时,钢管的直径不必设计得过大,角钢的尺寸设计应以撞深的要求为基础.

Anti-collision equipment of steel pipe trussrsupported by steel angles is designed for 9^# pier of Liede Bridge. Based on the ANSYS/LS-DYNA nonlinear FEM program, nonlinear FEM with momentary display function is applied to establishing the collision model of ship-collision protection of the bridge. Many characters are taken into account, such as material nonlinearity, geometric nonlinearity, contact nonlinearity and coupling characters among them, etc. The result can reflect the basic capability of anti-collision equipment of steel pipe truss supported by steel angles, the course of collision is simulated perfectly. The course of absorbing energy, collision depth and collision force of ship are eonsidbred with different steel pipe diameters and different steel angles sizes. At the same time, design idea is brought forward according to the principle of the eost and the availability. The depth of collision will increase if the force of collision increases generally. Kinetic energy of ship is basically absorbed by steel pipe truss in the form of internal energy, internal energy absorbed by steel angles is about 20 percent of the steel pipe truss. The diameter of steel pipe truss is not too large in design, the size design of steel angles should be based on the requirements of collision depth.