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起重机箱形梁在小车轮压作用下,上盖板除产生整体弯曲应力外,局部又产生弯曲变形,引起局部弯曲应力.本文介初这种局部弯曲应力的计算方法.假定上盖板为简支矩形板,用双重级数表示板的变形,导出局部弯曲应力计算式.对各种边长比、不同载荷作用位置的矩形板,利用电子计算机,计算出用于计算局部弯曲应力的数据,并列出表格表示.为设计提供了方便,大大简化了设计计算.局部弯曲应力计算值,略大于实侧值,保证了设计安全.可供设计者参考.
In addition to the overall bending stress generated by the upper deck, the box girder of the crane under the wheel pressure of the trolley also produces bending deformation locally, causing the local bending stress.This paper first introduces the method of calculating the local bending stress.It is assumed that the upper deck is simply Branch rectangular plate, the deformation of the plate is expressed by double series, and the formula of local bending stress is deduced.For the rectangular plate with different side length ratio and different load acting position, the data for calculating the local bending stress is calculated by the electronic computer, And lists the table shows. For the convenience of design, greatly simplifying the design calculation. Local bending stress calculated value, slightly larger than the real side value, to ensure the design safety. For the designer’s reference.