体外预应力加固桥梁正截面强度的计算

针对体外预应力加固梁时的受力机理和破坏形式，推导出了采用体外预应力加固设计的计算公式和应满足的条件，并应用于川藏公路某大桥的加固实践。该大桥根据本文所论述的原理进行加固后，一直维持了正常的通车和承载力，取得了良好的使用效果。该加固方法施工简单易行，加固效果明显。本文中所建立的体外预应力加固设计计算公式可供同类加固设计参考使用。

Calculation of Normal Cross Section Strength of a Bridge Strengthened with External Prestressing

According to the flexural behavior and failure modes of bridges strengthened with external prestressing, the calculation formula and relevant conditions that should be met in bridge strengthening design with external prestressing are developed, and applied to an actual bridge in Chuan-Zang highway. The bridge strengthened as per the theory and method of external prestress in this paper is now in normal operation and is of good carrying capacity under traffic load and have achieved good effect. This method of bridge strengthening with external prestressing is easy to use in construction, with remarkable strengthening effect, and cost effective.The formula developed herewith may serve as reference to other bridges to be strengthened in the similar conditions.