关键词: 桥梁工程, 体外预应力, PC箱梁, 非线性分析, 桥梁加固

Abstract: The bridges in service have some diseases with different degrees, which will cause some damages on the bridge structure, so they are strengthened in order to guarantee the safety. It is very effective to apply the externally prestressing reinforcement technology in improving the engineering performance of reinforced concrete bridges. Firstly, the bending analysis and nonlinear simulation of PC box girder with externally prestressing reinforcement were carried out; secondly, the lane load factor β was introduced and its value was checked, which proved that the externally prestressing reinforcement met the load design requirements. Then, a PC box girder with externally prestressing reinforcement was designed and calculated. The working state of bridge under nonlinear condition was obtained through the contrast of bridge reinforcement effect. The calculation results show that the bearing capacity, deflection and crack reinforcement of the bridge are obviously improved by the measure of external prestressing reinforcement.

Key words: bridge engineering, externally prestressing, PC box girder, nonlinearity analysis, bridge reinforcement