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本文探讨金属交叉梁的蠕变内力的求法。讨论范围仅限于主梁是单跨静定的情况。文中所述求法的主要步骤是:先列出以次梁支座的蠕变弯矩为未知函数的方程组,找出金属主梁蠕变挠度与其变载荷的积分关系。然后把上述方程组化成为以次梁蠕变反力为未知函数的积分方程组。解此积分方程组,得到次梁蠕变反力与时间的关系式。根据这个关系式,就可求出交叉梁内力与时间的关系。有了此种关系,便能判断所选的交叉梁在规定的期限内能否顺利工作。
This article discusses the method of calculating the creep internal force of metal cross-beams. The discussion is limited to situations where the main girder is a single span static. The main steps in this paper are as follows: Firstly, the equations of creep bending moment of secondary beam as unknown function are listed first, and the integral relationship between the creep deflection of metal main beam and its changing load is found out. Then, the above equations are formulated into integral equations with the secondary beam creep reaction force as an unknown function. Solution of this integral equations, the secondary beam creep reaction force and time relationship. According to this relationship, we can find the relationship between cross-beam internal forces and time. With this relationship, it is possible to determine whether the cross beam of choice will work smoothly within the prescribed time frame.