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为了节约钢材和减轻起重机的重量，大连起重机厂工人创议，在箱形起重机的腹板梁上 进行挖孔，可以达到上述目的。但挖孔后腹板梁的应力情况将发生什么变化呢？为了寻求这 个答案，本文根据该厂目前已采用的孔的形式之一──椭圆孔用光测应力方法进行了研究。 研究指出，不论载荷作用于跨度中央或支座附近，边孔孔周的应力集中现象均较为严 重，而且危险点几乎在同一位置上；其他各点应力集中现象不甚显著，在未削弱的截面上，实验结果所得的应力分布与理论计算一致。
In order to save steel and reduce the weight of cranes, Dalian crane factory workers proposed to dig holes in the box girder of a box crane to achieve the above objectives. However, after the hole digging the beam stress conditions what will happen? In order to find this answer, this paper is based on the method of photometric stress measurement of elliptical hole, which is one of the holes that the plant has adopted so far. The research indicates that the stress concentration around the perforations is serious regardless of the load acting on the center of the span or near the support, and the dangerous points are almost in the same position. The stress concentration in other points is not significant, and in the unweakened section The stress distribution obtained from the experimental results is consistent with the theoretical calculation.