## 6 Conclusions  
This paper centers on the first continuous beam and V-shaped pier rigid frame bridge with a steel-concrete composite girder in China. Based on the elasticity theory, a finite element analysis model of the whole bridge considering the construction stages was established by combining the structural characteristics and the construction process. Then, the initial stress state of the girders in each main construction stage is analyzed and the following conclusions are obtained.  
1. The stress of the upper flange of the steel beam in a cast-in-place section of the pier top is basically stable after the completion of cast-in-place concrete construction. Thereafter, the secondary load has no obvious effect on the stress of the upper flange of the steel beam. The substructure of the V-shaped pier results in additional tensile stress on the lower flange of the steel girder at the top of the V-shaped pier;
2. When the tensile stresses in the upper flange of the steel main girders at the top of the vertical and V-shaped pier are equal in magnitude, in the upper and lower edges of bridge slabs, the compressive stress reserve of the vertical pier is higher than that of the top cast-in-place section of V-shaped pier;
3. The bridge formation model without considering the construction process was compared with the finite element calculation results considering the construction process. The difference in stresses in the concrete slab between the two cases is found to be up to 2.7 MPa, indicating that the stress state in the bridge formation of the continuous beam and V-shaped pier rigid frame bridge with a steel-concrete composite girder is strongly influenced by the construction process;
4. There is a certain tensile stress on the upper edge of the concrete bridge floor in the negative bending moment area at the top of the V-shaped pier under the condition of bridge formation, up to 0.5 MPa, and the tensile stress may increase under the action of load, temperature difference, shrinkage, creep, etc., which is unfavorable to the stress of the concrete structure. During construction, prestressed steel bundles can be considered to make the fulcrum attachment bridge panel have a certain compressive stress when the bridge is formed.  
Conceptualization, Y.Z.; Resources, Y.X.; Data curation, T.Y. and W.L.; Writing--original draft, T.Y.; Writing--review & editing, Y.Z. All authors have read and agreed to the published version of the manuscript.  
The support of the Natural Science Foundation of China (Grant No. 51908093), Chongqing Returned Overseas Scholars' Entrepreneurship and Innovation Support Funds (Grant No. cx2018113, cx2020117), the Science and Technology Research Program of Chongqing Municipal Education  
Figure 21: Lower edges of concrete slabs under different calculation methods (MPa).  
Commission (Grant No. KJZD-K202300702), and National Key R&D Program Fund (Grant No. 2022 YFB2302501\(-\)3) are greatly appreciated.  
Not applicable.  
**Data Availability Statement:** All data generated or analyzed during this study are included in this article. All data included in this study are available upon request by contact with the corresponding author.  
The authors declare no conflicts of interest.