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结合国内外桥梁防撞的既有技术,对大跨径斜拉桥的防撞设计思路和方法进行了研究,并对常用防撞设计方法进行了对比分析。以江津粉房湾公轨两用斜拉桥为例,通过对大桥防撞特点的分析和防撞设计方法的比对,优化出了大桥的最佳防撞方法;基于动态非线性有限元理论,研究了大桥防撞主墩的总体结构抗力和代表船型作用下的碰撞力,分析了桥梁船舶撞击点位的受力特征。研究结果表明:在不同水位下,代表船型以各水位对应的撞击速度撞击(正、斜撞)大桥主墩,船撞力均小于结构的设计抗力,其中以P3主墩在187.83m水位遭受船舶正撞条件下的横桥向船撞力最大,约38.68MN,小于其对应的设计抗力66MN;虽然撞击位置局部角点出现拉应力超过C50混凝土自身抗拉强度的问题,但可通过增设构造钢筋来解决。
Combining with the existing technologies of bridge anti-collision at home and abroad, the research ideas and methods of anti-collision design for long-span cable-stayed bridges are studied and the commonly used methods of anti-collision design are compared and analyzed. Taking Jiangjin Fengyangwan dual-purpose cable-stayed cable-stayed bridge as an example, the optimal method of collision avoidance of the bridge is optimized by analyzing the characteristics of the bridge’s anti-collision and the design of anti-collision. Based on the dynamic nonlinear finite element theory , Studied the overall structural resistance of the main bridge pier against collision and the impact force on behalf of the ship type, and analyzed the force characteristics of the bridge ship impact point. The results show that: at different water levels, the ship collision impacted (positive and oblique collision) of the main pier of the ship at all levels corresponding to the water level, the ship collision force is less than the design resistance of the structure, of which the main pier of P3 suffered from the ship at 187.83m water level The maximum collision force of transverse bridge under normal impact conditions is about 38.68 MN, which is less than its corresponding design resistance of 66 MN. Although the tensile stress exceeds the actual tensile strength of C50 concrete at the local corner of the impact location, To solve.