Construction Control Studies Of Steel Pipe Concretes Stiffness Skeleton Of Railroad Handbasket Arch Bridge

The evolution of construction control techniques of steel tube Arch-bridge is represented in detail in this thesis, and problems of steel skeleton lifting to be solved are summarized. To avoid the defects of two cable-force calculating method:moment equilibrium and FEM "Zero-displacement", a new method which integrates cable parts (cable elements) and steel tube frames (beam elements, truss elements) as a whole analytical model is presented to simulate lifting and setting up of steel tube frame, and optimum cable forces can also be provided by this method. A set of optimum cable forces before closure of two parts of steel tube frames, which can qualify forward setting-up and backward removal analysis of frames, are calculated by several times iterative computation procedures of this method. The level and stress control data are provided by this method. It proves that such method can assure good closure conditions and accurate control datum. Theoretical temperature effects datum which is of good instruction to selection of closure time and closure temperature are calculated by temperature effects simulation.The support conditions of arc springing are identified and improved to guarantee setting-up of frames with the aid of stress measurement of steel tube at arc springing. Plenty of theoretical data assure the safety and stability of structures and tension of cables. The measurements of steel tube stress, frame level and cable forces are in good accordance with theoretical control results. It proves that such method applied in this thesis is correct, the simulating results are accurate. The steel tube frame of arc rib is set up well.The single point stress and average stress of steel tube are normal during concrete filling of bottom 4 steel tube, and the level and stress measurements are in good accordance with computation results. During the concrete filling of topper 4 steel tube, the level and stress measurements are in good accordance with computation results. The difference of sum measurement level and sum theoretical level of frame can be compensated in next construction stages...