预应力混凝土箱梁桥锚固区裂缝分析

预应力混凝土连续梁桥是一种被广泛使用的桥型,但近些年在一些跨径较大的已建桥梁中也出现了较多的病害。预应力混凝土箱梁桥锚固区裂缝是预应力混凝土箱梁桥的常见病害,严重的甚至威胁到桥梁整体的使用性能。本文通过受力分析及有限元计算对箱梁桥锚固区的常见裂缝进行研究,分别对锚固齿板的不同位置进行有限元分析。并根据有限元分析结果提出了锚固区的简化计算方法及构造配筋方式,最后得出针对这些裂缝现象的可行的控制方法。

Analysis of the Crack in the Anchoring Zone of Pre-stressed Concrete Box Gider Bridge

Pre-stressed concrete continuous beam bridges have been widely used for its adaptability for long-span bridges. However, many diseases have been found in some long-span bridges of this kind in recent years. One of the common diseases found in pre-stressed concrete continuous beam bridges is the cracks in the anchorage zone, among which some serious cracks even can be a threat to the overall performance of bridges. In this article, various cracks of anchorage zone have been analyzed by stress analysis and finite element analysis, and finite element analysis has been done in different place of anchor tooth plate. Then the simplified calculation method and structural reinforcement method have been presented according to the FEM results. Also some feasible ways to control these cracks have been presented.