大跨度预应力混凝土连续梁预应力损失研究

Study on Prestress Loss of Long Span Prestressed Concrete Continuous Beam

针对连续梁桥常见的预应力损失问题,从3个方面进行了详细的介绍,首先与简支梁受力做对比,分析了开兰特大连续梁桥结构受力和从"强梁弱墩"角度讲述了连续梁桥的受力特征,接着介绍了预应力损失估算方法和预应力损失对于连续梁桥的影响,如引起腹板斜裂缝甚至跨中下挠严重,最后针对预应力损失,针对性的提出施加体外预应力和粘贴钢板的措施,可以起到较好的加固补强效果。希望为今后类似工程提供可资借鉴的经验。

Aiming at the common loss of prestress of continuous girder bridge, from the following three aspects, the author conducted a detailed introduction, first, the force was compared with a simply supported beam, and a large continuous girder bridge structure was analyzed. From the perspective of ＂strong beam weak pier＂ the paper told the story of force characteristics of continuous girder bridge, and then introduced the method for estimating the loss of prestress and loss of prestress to the influence on the continuous girder bridge, such as web inclined crack and even across middle scratching, finally in view of the loss of prestress, the measures of external prestressing and pasting steel plate were put forward, which had good reinforcement reinforcement effect. The study provided experience for similar projects in future.