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格构式吊杆是移动式起重机的主要构件之一。作用在其上的外力大部分为压缩荷载。吊杆的计算结果控制着起重机的起吊性能,同时,由于吊杆的破坏直接关系着人命,所以正确的压屈强度计算是很重要的。格构式吊杆按中心受压杆的压屈来研究。以前,在材料的弹性范围内压屈时用欧拉公式,在非弹性范围内压屈时用实验公式,如20世纪的恩格塞尔理论等。现在,在以此为基础的各国设计标准中,计算公式和压屈曲线的假定等各不相同。此外,近年来由于计算机的发
Lattice lattice is one of the main components of mobile cranes. Most of the external forces acting on it are compressive loads. The calculation result of the boom controls the lifting performance of the crane. Meanwhile, the correct calculation of the buckling strength is very important because the destruction of the boom is directly related to human life. Lattice lattice rod pressed by the center to study compression. In the past, the Euler formula was used for buckling in the elastic range of materials and the experimental formula for buckling in the inelastic range, such as the ENGELER theory in the 20th century. Nowadays, the calculation formulas and the assumptions of the buckling curve are different among the design standards based on this. In addition, in recent years due to the development of computers