A certain railway swing bridge is a three-dimensional asymmetric and extremely special-shaped steel box girder bridge.The width at both ends of the bridge is very different,and the steel box girder has a special structure.The process of dropping steel box girder involves the mutual coordination of forces between the beam body,tower tower,stay cables and steel brackets.Taking the special-shaped steel box girder as the research object,a numerical model was established,and numerical simulation analysis was carried out on each construction step of stay cable tensioning and bracket removal to determine a reasonable frame dropping sequence.Research shows that using temporary pylon and installing stayed cables to assist the main beam in stress are necessary and reasonable measures during swing construction.The reasonable demolition sequence is to first remove the brackets near the beam end in the middle,and then gradually remove the mid-span brackets towards the middle pier.After the stayed cables are fully tensioned,the brackets at the side piers and middle piers are removed.The structural stress and deformation are within a reasonable range during the frame lowering process.
万方数据
维普
