Study On Structural Systems And Mechanical Properties Of Ground-anchored Concrete Cable-stayed Bridge With Single Inclined Pylon

In this paper,based on the science and technology project of Guizhou Provincial Transportation Department,which is the research of the key technology on the construction of the ground-anchored concrete inclined pylon cable-stayed bridge with inclined pylon named Furong River Bridge(project number :2016-123-048).By ensuring that the main beam's elasticity supporting force provided by cables is unchanged,and the reasonable range of the anchorage box's location,the reasonable range of the inclined pylon's angle,the reasonable range of the stay cable's angle,and the layout mode of cable plane are studied by the system of plane intercrossing forces.The following research work is carried out around the structural system and structural parameters of Furong River Bridge.(1)The rationality of structural design of cable-stayed bridge with single pylon is analyzed.The resultant force's direction of each structural system of cable-stayed bridge with single pylon is analyzed by mechanical characteristics,and the rationality of structural design of cable-stayed bridge with single pylon is discussed by the influence of resultant force.Additionally,the structural system of the constructed cable-stayed bridge with single tower is analyzed and verified,then some suggestions on the structural design of the cable-stayed bridge with single pylon are given.(2)The reasonable range of the anchorage box's location of cable-stayed bridge is studied.The formulas of material amount of anchor cables are derived and the influencing rule of the anchorage box's location on material amount of anchor cables is obtained.Using the finite element software to analyze the effect of the anchorage box's location on static characteristic of this structure,the curves of the main beam's and tower's the bending moment,deflection,and the maximum cable force are obtained.Based on the analysis results,the reasonable range of the anchorage box's location of the cable-stayed bridge is determined.(3)The reasonable range of the inclined pylon's angle of cable-stayed bridge is studied.The formulas of material amount of all cables are derived and the influencing rule of the inclined pylon's angle on material amount of all cables is obtained.Using the finite element software to analyze the effect of the inclined pylon's angle on the structural strength,stiffness,and completion cable forces,the curves of the main beam's and tower's stresses and deflection,and influence values of completion cable forces are obtained.Based on the analysis results,the reasonable range of the inclined pylon's angle of the cable-stayed bridge is determined.(4)Using the finite element software to analyze the effect of beam/pylon rigidity ratio on static characteristic of this structure,the curves of the main beam's and tower's the inner force,deflection,and the maximum cable force are obtained.Conclusions are drawn to optimize the structural design of the similar cable-stayed bridges.(5)The research on the layout mode of cable plane,the reasonable range of the pylon's height and the stay cable's angle is carried out.The formulas of cost of all cables and the pylon are derived,and the influencing rule of cable plane's layout mode,the pylon's height and the stay cable's angle on cost of all cables and the pylon is obtained.Using the finite element software to analyze the effect of cable plane's layout mode,the stay cable's angle and the pylon's height on static characteristic of this structure,the influencing values of the main beam's and tower's the inner force and deflection are obtained.Based on the analysis results,the cable plane's layout mode,the reasonable range of the pylon's height and the stay cable's angle are determined.