体外预应力加固桥梁挠度分析

本文桥梁在建成后，经过多年运营及在温度应力作用下，主跨跨中出现了严重下挠病害。采用体外预应力技术对其进行加固。在结构加固中，确定体外预应力的设计并推导出加固后挠度计算公式。挠度监测点监测结果与挠度计算公式计算结果相比误差均小于5％，实践表明体外预应力加固后挠度计算公式是正确的，且表明此加固技术是减小挠度的有效方法。

The deflection analysis of the bridge strengthened by external prestressed

The main span cross of the bridge in this paper appeared the serious down - warping plant disease causing by long - time operation and temperature stress. The bridge was reformed by using external prestressed strengthening technology. During the reinforcement, we confirmed the design of externally prestressed and proposed the calculation formula of the deflection after reinforcement process. The error between monito - ring results of deflection monitoring stations and calculation results of deflection formula was less than 5 %. The results showed that the deflection calculation formula after externally prestressed reinforcement was correct and the externally prestressed reinforcement technique is the effective method to reduce the deflection.