论文部分内容阅读
混凝土的徐变变形约为其弹性变形的1—3倍。在钢筋混凝土中,徐变会引起应力重新分布。在预应力混凝土中,徐变会使预应力有所损失。因此一直是人们所关心的课题,从文献[1]可知,直接用弹性徐变理论对钢筋混凝土和预应力混凝土进行徐变分析,对于单层配筋构件将归结于一个积分方程,对于多层配筋构件,将归结于一个联立的积分方程组,求解都比较费事。本文另辟蹊径,先在弹性徐变理论的基础上,给出了混凝土和钢筋的应力-应变的增量关系和递推公式,然后提出了钢筋混凝土和预应力混凝土徐变分析的通用公式避免了积分方程的建立和求解。由于利用了递推关系,公式结
The creep deformation of concrete is about 1-3 times of its elastic deformation. In reinforced concrete, creep can cause stress redistribution. In prestressed concrete, creep will result in loss of prestress. Therefore, it has always been a concern of people. From the literature [1], we can directly use the creep and creep theory to perform creep analysis of reinforced concrete and prestressed concrete. For a single layer of reinforced components, it will be attributed to an integral equation and to multiple layers. Reinforced members will be attributed to a simultaneous set of integral equations and the solution will be more complicated. In this paper, a new approach is adopted. First, based on the theory of elastic creep, the incremental stress-strain relationship and recursive formulae for concrete and steel are given. Then, a general formula for the creep analysis of reinforced concrete and prestressed concrete is proposed to avoid integration. The establishment and solution of equations. Due to the use of recursive relations, the formula knot