既有箱梁桥随着公路交通等级的不断提升,其承载能力能否满足规范要求,成为当前急需解决的问题。通过对1座预应力钢筋混凝土箱梁桥进行载荷试验,分析了在公路交通等级提升下,桥梁的承载能力和行车时桥梁振幅变动的安全性、舒适度。又通过对其承载能力的评估,分析了桥梁现况,为交通管理部门对桥梁维修、加固提供参考。 As the existing box girder bridge with the continuous improvement of traffic level, its carrying capacity can meet the regulatory requirements, has become the current urgent need to solve the problem. Through the load test of a prestressed concrete box girder bridge, the safety and comfort of the bridge carrying capacity and the amplitude of the bridge during driving are analyzed under the upgrade of the highway traffic grade. Through the assessment of its carrying capacity, the status quo of the bridge is analyzed, providing reference for the traffic management department on the bridge maintenance and reinforcement.