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一、概述起重机车架结构是一个复杂的空间结构体系。它承受着垂直于结构自身平面的载荷,并通过四个支腿搁置于地面。在某些载荷工况下起重机的一个支腿的支承反力为零,这时车架处于三点支承状态。是否允许起重机在吊重时一个支腿抬起,至今仍是有争议的问题,本文不拟就此问题进行讨论。但在设计中如何计算并控制抬腿量却是一个需要解决的问题。现在已有一些单位应用有限元分析法在电子计算机上分析车架的内力与变形,但对于支
First, an overview Crane frame structure is a complex space structure system. It is loaded perpendicular to the plane of the structure itself and rests on the ground with four legs. Under certain load conditions, the supporting force of one leg of the crane is zero and the frame is in three-point support. It is still a controversial issue whether to allow a crane to lift during hoisting. This article does not intend to discuss this issue. However, how to calculate and control the amount of leg lift in the design is a problem to be solved. Now some units have applied finite element analysis to analyze the internal force and deformation of the frame on the electronic computer, but for the branch