Research On The Design Parameters And Mechanical Behavior Of Cable-Tower Anchorage Zone Of Rail-Road Cable-Stayed Bridge With Span Length Over 1000 M

Long-span rail-road cable-stayed bridge has the advantages of good structural rigidity,good wind resistance,relatively low cost,is the preferred bridge type for the design of rail-road bridge.With the span of rail-road cable-stayed bridge is increasing,and even breaking the kilometer-class,but there is a lack of systematic study on the main design parameters and cable anchor structure.In this paper,aimed at the standard of live load,the main design parameters and the performance of anchorage zone of cable-stayed bridge,the following research work has been done.Firstly,summarizes the development and structural characteristics of the rail-road cable-stayed bridge,summarizes the structural analysis theory of cable-stayed bridge,the finite element theory,geometric nonlinear theory of cable-stayed bridge and local analysis theory,the relevant theories are introduced and the necessary carding.Secondly,this paper uses the finite element software to establish the spatial finite element calculation model of cable-stayed bridge,which is based on the a rail-road cable-stayed bridge with span length over 1000 m.The distribution of cable force,the vertical displacement and stress of main truss botttom chord under the cable-stayed bridge of the reasonable finished dead state,the first twenty modes of the cable-stayed bridge were calculated.Study on the live load standard of rail-road cable-stayed bridge with span length over 1000 m,analyzes the the influence of different loading length to the vertical displacement and force of the main grider and the displacement and internal force of tower and the force of cable.Thirdly,considering the main design parameters of the bridge,such as the arrangement of side span auxiliary pier,span ratio,tower beam span ratio,high span ratio of main girder and wide span ratio of main girder,the static and dynamic characteristics of the structure are studied when the design parameters are changed in a certain range,comparative analysis of the sensitivity of the main design parameters to the static and dynamic characteristics of cable-stayed bridges,and summarizes the main design parameters on the influence of rail-road cable-stayed bridge with span length over 1000 m.Fourthly,select the anchorage zone segment model which bearing the largest horizontal component,study the deformation and stress of steel anchor girder and steel corbel under in 1.1 times of cable force,and the stress state of each steel plate is analyzed in detail;analyzes the effect of stiffened plate of steel anchor beam web in the transmission of cable force,and studies on the stress state of the connection position of the top plate,the bottom plate and the web of the steel anchor beam under the different number,thickness and width of the stiffened plate.Based on the study of the live load standard,the main design parameters and the static behavior of the anchorage zone of cable stayed bridge,the conclusions can be used as reference for the same type of bridge design.