某在建斜拉桥在悬浇主跨最后一个主梁节段时,发生了斜拉索脆断的偶然事故,形成的冲击荷载引起斜拉桥的剧烈振动。用有限元方法对这一过程进行了非线性数值分析,计算了结构内力和位移的时程响应,动力分析结果表明,斜拉索脆断引起的结构振动对结构安全没有构成威胁。 When a cable-stayed bridge under construction is suspended at the last main girder section of the main span of the suspended girder, an accidental accident of cable stayed brittle fracture occurs and the impact load formed causes the violent vibration of the cable-stayed bridge. The finite element method is used to conduct nonlinear numerical analysis of this process. The time-history response of the internal forces and displacements of the structure is calculated. The dynamic analysis shows that the structural vibration caused by the diagonal cable stay is not a threat to the structural safety.