混合结构是工程上广泛采用的结构形式,如钢筋混凝土,予应力混凝土和钢木混合结构等。由于建筑材料如混凝土、石膏、塑料、木材等大多具有蠕变特性,因而结构内部应力将随着时间而重新分布。另外,有许多结构本身是均质的,但支承在弹性支座上,即边界条件是混合的,这种结构的内部应力也会随着时间而重新分布。因此蠕变引起的应力重分布是工程上广泛存在的一个问题。目前已有的一些计算方法都十分复杂,不切实用。本文研究了由蠕变引起应力重新分布的普遍情况,采用长期弹性模量的概念,论证了因蠕变而重新分布后的长期应力状态决定于长期弹性模量,正如瞬时应力状态决定于瞬时弹性模量一样。这一结论具有重要实际意义,因为设计人员依靠普通建筑力学就可以解决应力重分布问题,而不必去 The mixed structure is widely used in engineering, such as reinforced concrete, prestressed concrete and steel-wood mixed structures. Because the building materials such as concrete, gypsum, plastics, wood, etc. mostly have creep characteristics, the internal stress of the structure will be redistributed over time. In addition, there are many structures that are homogeneous in nature, but are supported on elastic supports, ie, the boundary conditions are mixed and the internal stresses of such structures are redistributed over time. Therefore, the stress redistribution caused by creep is a widespread problem in engineering. Some existing calculation methods are very complicated and not practical. In this paper, the general situation of stress redistribution caused by creep is studied. Using the concept of long-term elastic modulus, it is demonstrated that the long-term stress state redistributed due to creep depends on the long-term elastic modulus, just as the instantaneous stress state depends on the instantaneous elasticity. The same modulus. This conclusion has important practical significance, because designers can rely on ordinary building mechanics to solve the problem of stress redistribution without having to go