Study on the Stress Impact of Side-to-middle Span Ratio on Large-span Continuous Rigid Frame Bridge in Mountain Areas

The article used the displacement method to derive the cross-sectional bending moment and beam end rotation formula of continuous rigid frame bridge model,compared the change of internal force for this model under different parameter values,and in combination with the practical engineering examples,it analyzed the relationship among the side-to-middle span ratio of continuous rigid frame bridge,the internal force of its pier beam,the beam-end rotation,and the deflection from the perspective of structural stress,and proposed the reasonable suggestions for the value taking of side-to-middle span ration in the same type of bridges.