Abstract
Long-span continuous rigid frame bridges are widely used due to their good overall performance, small deformations and good seismic properties. However, quality is difficult to guarantee during construction, which affects the bearing capacity of the bridge and the safety and durability of the structure. In order to improve the mechanical performance of continuous rigid frame bridges, the extended cross section method and the external prestressing method are discussed based on an engineering example. By comparing before and after reinforcement, the results show that the internal stresses of the reinforced structures by the two methods meet the bearing requirements. After the comparative analysis, it was concluded that the extended section method can be applied to the reinforcement of continuous rigid frame bridges under certain conditions, which can serve as a reference for other bridge reinforcement projects.
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