Stress Analysis Of Anchoring Process Of Steel Anchor Beam Of Concrete Cable Tower Of Cable-Stayed Bridge

Cable-stayed bridge is a kind of high-order statically indeterminate system structure.the pylon is the main load-bearing component,and it is also the key part of the control design and construction of the long-span cable-stayed bridge.The span of the cable-stayed bridge is getting larger and larger,and the requirements for the control accuracy and construction accuracy of the tower are also increasing.The way to transfer the huge cable force to the concrete tower column is a problem that needs to be solved.Moreover,due to the influence of the opening of the stay cable on the tower on the weakening of the cross section of the tower,the force of the anchorage zone of the tower is more complicated.In this paper,the Jiayu Yangtze River Highway Bridge is used as the engineering background to analyze the force of the cable tower.The research focuses on the stress variation of the Steel anchor beam-steel leg combination cable-stayed anchorage structure under different connection modes,and the influence of different prestressed steel beam arrangement on the stress of the cable tower.The main research contents are as follows:(1)Introduce the theory and calculation method of reasonable design state and geometric in the calculation of cable-stayed bridge.The finite element software Midas civil is used to analyze the full bridge of Jiayu Bridge to get the full bridge force displacement conditions and the stress changes in the North Tower at different stages.(2)The influence of the different connection modes of steel anchor beam-steel legs on cable tower is analyzed.There are various connection methods between the steel anchor beam and the steel legs during the tension cable tensioning process.The single-stage spatial finite element model of the cable-stay anchorage zone was established by Midas FEA,and the stress changes of steel anchor beam and steel legs in various parts under four different connection modes were compared.(3)The stress analysis of the anchorage zone of the cable tower under three different prestressed tendon arrangements is analyzed.Change the layout shape only without changing the original parameters.The three kinds of prestressing arrangements are used to analyze the stress of the cable tower under the action of the three prestressing arrangements and the cable tension.It provides theoretical support for the selection of prestressed steel bundles in the anchorage zone of Jiayu Bridge cable tower.And it provides a reference for the selection of prestressed arrangement of similar pylons in the future.