螺丝钉连结的组合樑

COMPOSITE BEAMS JOINTED BY BOLTS

一.引言 我们已经熟悉了用相当刚度计算组合樑的方法,但是这种方法只能用于组成组合樑的二樑完全贴合在一起,也即只能适用于二樑变形完全相同的情况,对于用只有若干个螺丝钉连结的组合樑,显然是不能适用的。本文将提供一解决螺丝钉连结的组合樑问题中计算螺丝钉处集中力及每一樑中弯矩的简便方法。

In this paper, it is proved that the problem of composite beams jointed by bolts can be solved in terms of certain equivalent continuous beams. The equivalent beam is specified as follows:1) It consists of supports of the original beam and equivalent supports situated at the points where bolts are used.2) It is loaded by the given load on the original beam.Then the reactions at the bolts in the original composite beam are equal to a constant C times the reactions at various supports of the equivalent continuous beam. The constant is equal towhere E] and E']' are flexaral rigidities of the first and second parts of the composite beam respectively, and k is the distributing ratio of load on the second part.The solution of the problem is then greatly simplified.This method can be generalized for composite beams consisting of more than two parts, on which the given load is not proportionately distributed.