Design Parametric Analysis And Research Of Large-span Continuous Rigid Frame Bridge

Continuous rigid frame bridge has many advantages，such as the bending moment ofmidspan and bearing is uniform，structural force is reasonable，Cantilever construction isunlimited by space，driving is comfortable，so it is used widely in bridge onstruction. But thedesign parameters of continuous rigid frame bridge such as depth-span ratio、side thanacross、box girder inferior curve is according to the experience of analogy or with thealgorithm trying sure in the past，these methods have some limitations. on the basisof summarizing the design parameters of previous long span continuous rigid frame bridge，The thesis do further research for the depth-span ratio and the wall thickness piers of alongthe bridge of continuous rigid frame bridge.The thesis taking shanxi a three span continuous rigid bridge as the background，Analysis the change of internal force and stress of key section wih the constant load、prestressed load、whole system of warming load and temperature gradient load，and comparethe stressd and internal force under different load conditions；By changing the root height ofthe box girder and span ratio and the central height of the box girder and span ratio，Analysisthe change of internal force and stress of key section wih the constant load and whole systemof warming load，based on paramrtric analysis， use the grid search method，find the optimalheight-span ratio by using optimization theory；by changing the thickness of along the piers，Analysis the change of internal force wih the constant load、whole system of warming loadand temperature gradient load. under different the thickness of along the piers，Analysis andcompare the change of internal force and stability of the biggest cantilever construction phaseunder different load condition.