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设计打桩船上的桩架,过去常用类似于起重机臂架的设计方法,即将外载荷分解成作用于臂架摆动平面上和垂直于摆动平面上的力,来计算出此两平面上臂架是否会总体失稳。但是由于桩架力学模型的支承条件与起重机臂架不同,故桩架显得笨重。本文用连续变截面悬臂梁力学模型,并根据能量法原理推导出较符合实际的计算桩架总体失稳的临界载荷公式。
The design of piling on piling vessels used to be similar to the design of crane boom, that is to say, the external load was decomposed into the force acting on the swinging plane of the boom and the swinging plane perpendicular to the swinging plane to calculate whether the boom on the two planes would overall Instability. However, the pile frame appears cumbersome because the supporting conditions of the pile frame mechanical model are different from that of the crane boom. In this paper, a continuous variable cross-section cantilever beam mechanical model is derived, and a more realistic practical formula for calculating the critical load of pile-frame instability is derived based on the energy law.