Designing Parameter Study Of Spatial Cable Plane Self-anchored Suspension Bridge With Single Tower

Self-Anchored Suspension Bridge is a kind of elegant bridge.The main cable anchors on the stiffening girder directly,so it doesn't need to build a huge anchor ingot,and can save a lot of cost.It's suitable for building in poor geological conditions of region.The main cable gives a large horizontal pressure force to the stiffening girders,lets them get the free prestressing force.In addition,the spatial cable plane system as a new kind of structural style,its main cable and suspender form a three-dimensional cable system.The main cable and stiffening girder are more cohesive.The cable enhances the effect on the bondage of stiffening girder,improves the lateral stiffness and stability.Therefore,in recent years,spatial cable plane system gets gradually the favour of the bridge builders,and has been widely applied in the Self-Anchored Suspension Bridge engineering.Spatial Cable Plane Self-Anchored Suspension Bridge with Single Tower is complex loading,and the calculation theory is not perfect enough.At this stage,what should we research and complete is that how to make the system more reasonable in terms of force through adjusting the structure design parameters,making the system bridge more scientific and more evident in the design.This paper uses Songyuan Tianhe South Branch Bridge as the engineering background,the finite element model was established based on Midas Civil,analysis of the main design parameters what have impact on the static and dynamic characteristics of Spatial Cable Plane Self-Anchored Suspension Bridge with Single Tower.In this paper,the research content and conclusions include:(1)The finite element model of Spatial cable plane system and parallel system were set up respectively,under the action of dead load,live load and temperature load,through calculating the structural internal force and deflection value,comparing the difference of structural static characteristics.And then use the eigenvalue analysis and choose Lanczos method to calculate the main vibration mode and natural frequency of structural vibration,through comparing the difference of lateral vibration,torsional vibration,vertical vibration of the two systems,so as to explore the difference of static characteristics of the two systems.It found that the lateral stiffness and horizontal carrying capacity of the spatial cable plane system are superior to the parallel system,and the vertical stiffness of two kinds of systems have no difference.(2)These main structural design parameters,such as tensile stiffness of the main cable and boom,the rise-span ratio,the distance between booms,the bending stiffness of stiffening girder and dead load degree,have a significant impact on the structural static and dynamic characteristics.This paper firstly adopts the single variable method to change the single design parameter value,and secondly calculates the structural internal force and deflection value under the action of dead load and live load,finally analyze the effect which the change of parameters have on structural static characteristics.And then use the eigenvalue analysis and choose Lanczos method to calculate the main vibration mode and natural frequency of structural vibration,through analyzing the effect which the change of the parameters have on the structural dynamic characteristics,revealing the inner link between design parameters and structural characteristics,so as to provide convenience for the optimization design.