Fine Analysis of the Main Bridge of the No. 2 Bridge of the Shouyang Huaihe River Mega Bridge

With the development of science and technology as well as transportation, large-span prestressed box girder bridges (continuous girder bridges and rigid frame bridges) have experienced rapid growth in recent years. However, due to their relatively late appearance, their theory and experience are not yet fully mature, and there are also some technical issues in the construction process. In large-span prestressed concrete girder bridges, there are obvious structural damages. On one hand, cracks in different directions appear at different positions of the box girder's different sections. On the other hand, the long-term development of structural deflection greatly exceeds the design expectations. However, traditional stress indicators cannot accurately determine the specific location and cause of cracks. It is necessary to combine the inspection of actual bridges, which is inconvenient for bridge design. According to the 2018 new specifications (Design Specifications for Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts, JTG 3362–2108), this paper will use the large-scale general finite element software WISEPLUS and adopt a spatial grid model. It will also combine a comprehensive stress indicator system to explore the possible cracks and causes in Bridge No. 2 of Shouyang Huaihe Bridge.