## 4 Calculation Results of the Phased Construction Process
### Comparative Analysis of Each Stage  
The performance of the steel beam upper flange, steel beam lower flange, upper edge of concrete slab, lower edge of concrete slab, and deflection of the whole bridge in different construction stages are compared and analyzed in the following. (1) Flange stress on the steel beam  
The calculation results of the construction process of the upper flange of the steel beam are shown in Figure 12.  
Figure 11: Stress of bridge floor and V-shaped pier in the completion stage: (a) bridge floor stress; (b) stress on the upper flange of the v leg; (c) lower flange stress of the v leg. (Instructions: in the picture, e + 000 means 10,000, e + 001 means 10,001, and so on). Figure 12: Stress of the upper flange of the steel beam in each construction stage (MPa). Before the construction of the negative bending moment zone is completed, the tension stress curve of the upper flange of the steel beam is continuous and has no sudden change in the longitudinal direction of the bridge. The stress increases evenly with increasing mid-span constant load. After the construction of the negative bending moment zone, the stress curve of the upper flange of the steel beam has an obvious catastrophe. After the unloading under medium pressure and heavy load, the elastic deformation of the flange plate on the steel beam is difficult to recover due to the restraint of studs by concrete. The tension stress level of the steel beam is maintained to a certain extent. The effect of secondary loads on the upper flange of the steel beam is not obvious and the stress curves of the upper flange of the steel beam are almost identical before and after the addition of the secondary loads. 1. Stress of lower flange of steel beam  
As shown in Figure 13.The asymmetric structure of the bridge also causes the force to be asymmetrical. Under the condition of the bridge, the control section of the lower flange of the steel beam is at the top of P4 pier near the main span and the maximum compressive stress is 94.8 MPa; the control section of tensile stress is at the position of side span k7 near the middle span and the maximum tensile stress is 57.4 MPa. It can be found that the stress at the joint between the top of the V-shaped pier and the lower flange of the main beam changes abruptly, indicating that the V-shaped pier exerts additional stress on the steel main beam compared with the vertical pier. 1. Stress of the lower flange of the steel beam in each construction stage (MPa). 2. Stress of the upper edge of the concrete slab  
The calculation results of the construction process of the upper edge of the bridge deck are shown in Figure 14. It can be seen that when the mid-span bridge deck is just laid, the longitudinal force of the bridge deck is not stressed. At the end of the construction of in situ cast concrete slabs in all negative bending moment zones, the reserve of compressive stress in the negative bending moment zone reaches the maximum value. At this time, the longitudinal edge of the full bridge concrete slab is under pressure. After secondary loading, the top tensile stress of the V-shaped pier is small, the top compressive stress reserve of the vertical pier is reduced, and the upper edge of the concrete is still under free pressure. It can be seen that the effect of applying pressure stress reserve to the negative bending moment area of a vertical pier top is better than that of the negative bending moment area of a V-shaped pier top when the same construction method is used. It is considered temporarily to be caused by the vertical rigidity of the V-shaped pier. Figure 13: Stress of the lower flange of the steel beam in each construction stage (MPa). (4) Stress of the lower edge of the concrete slab  
The calculation results of the construction process of the lower edge of the bridge deck are shown in Figure 15. From the longitudinal direction of the whole bridge, the lower edge of the concrete slab maintains a low-stress level after the construction with the compaction method.