二次预应力技术应用于桥梁结构的探索研究

在中小跨径的预应力梁式桥中经常出现张拉过程中直梁反拱过大、弯梁横移、刚架立住开裂等问题，这些都是由于预应力附加内力过大引起的。为了解决此类问题，提出了二次预应力装配一整体新型桥梁结构的概念。通过对这种结构与常规预应力结构的分析比较，可以看到二次预应力装配一整体结构具有良好的受力性能和广阔的推广应用前景。

Explorative Research on Double Prestress Technique Applied to Bridge Structure

In prestressed girder bridges with medium and short-spans, there often appear some problems in the course of tension such as too much reversed deflection on straight girder, transverse movement of curved girder and cracks in the column of rigid frame bridge, which are all resulted from excessive accessional internal force caused by prestressing. In order to solve the problems mentioned above, the ideas of new bridge structure with double prestress assembly-integral is put forward. Compared with normal prestressed structure, the double prestress assembly-integral structure shows good mechanic behavior and is worth popularizing.