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起重机大梁,按其结合形式可分为整体式(如箱形—包括一侧挖孔)和组合式(如四桁架—包括主、副桁架都是工字形的组合式)两种。一般的四桁架梁,小车轮压作用在主桁架竖轴上,没有通过组合梁的合扭心,所以除弯曲外,还承受扭转。扭转使副桁架边缘点的应力成倍地增加。因此设计一种受主要载荷—小车轮压—后不发生扭转的组合梁是合理的。这
Crane girder, according to the combination of its form can be divided into the overall (such as box - including one side hole) and modular (such as four truss - including the main and auxiliary truss are I-shaped combination of two). Generally four truss beams, car wheel pressure acting on the main truss vertical axis, not through the combination of twisted torsion hearth, so in addition to bending, but also to reverse. Reversing causes the stress at the edge of the secondary truss to increase exponentially. Therefore, it is reasonable to design a composite beam that is not subject to torsion after being loaded with the main load-wheel pressure. This