论文部分内容阅读
在预应力混凝土构件中,将产生各种预应力损失。其中,以混凝土收缩、徐变产生的预应力损失最大,情况也较复杂。特别是混凝土的徐变,还将使构件的变形不断增加,在某些情况下还会引起内力重分布。因此,弄清这些问题,也是一件有意义的事。一、铁路规范有关规定影响混凝土收缩、徐变的因素较多,主要有混凝土配合比(尤其是水泥用量和水灰比)、构件尺寸、周围环境的温湿
In prestressed concrete components, various prestress losses will occur. Among them, the loss of prestress caused by shrinkage and creep of concrete is the largest, and the situation is also more complicated. In particular, the creep of concrete will also increase the deformation of the components, and in some cases it will cause the redistribution of internal forces. Therefore, it is also a meaningful matter to clarify these issues. 1. There are many factors that affect the shrinkage and creep of concrete in the relevant provisions of the railway specification, mainly including the concrete mix ratio (especially the cement content and the water-cement ratio), the size of the components, and the temperature and humidity of the surrounding environment.