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分析目前贮木场装卸桥出现的技术事故，对传统的设计荷载的依据提出了质疑．经过对工作过程的分析，应用了力学Ｌａｇｒａｎｇｅ原理，建立了货物提升和下降运动的二自由度振动方程，并求解方程的特征值，得出了最大动荷载（即设计荷载）的计算与下降速度有关，它产生于货物下降时制动的瞬间而不是货物提升离地的初瞬间
Analysis of the technical problems occurring in the loading and unloading bridge of the existing timber yard puts forward doubts on the basis of the traditional design load. After analyzing the work process, the Lagrange principle of mechanics is applied to establish the two-degree-of-freedom vibration equation of cargo lifting and descending movement. The eigenvalue of the equation is solved and the calculation and descending speed of the maximum dynamic load (ie design load) Relevant, it arises from the moment of braking when the goods descend instead of the first moment of lifting of the goods