Pre-camber Setting For Double-deck Cable-stayed Bridges

Cable-stayed bridge is made of the tower, cable, beam combination system of thebridge, due to the existence of the stay cables of cable-stayed bridge become the highorder statically indeterminate structure. Double-deck cable-stayed bridge on the lineardemand is very high, so the design of the double-layer cable-stayed bridge is a throughsetting camber in advance to control the double-deck cable-stayed bridge to bridge linemeet the design line problem. How to determine reasonable into bridge state ofcable-stayed bridge, and how to determine reasonable construction state ofcable-stayed bridge is involved in camber setting scheme is reasonable.Double-deck cable-stayed bridges between upper and lower two layers willproduce significant influence, this led directly to double cable-stayed bridge is largerthan that of ordinary single force and structural deformation of cable-stayed bridge ismuch more complicated. In this paper, based on a bridge as the analysis object,Sichuan province Mianyang NO.1Bridge, to analysis the pre-camber of thedouble-deck cable-stayed bridges:1. Introduces the development history of cable-stayed bridge, expounds thedefinition and calculation in the process of the camber and the influence of variousfactors on the pre camber setting.2. Using large-scale finite element analysis software MIDAS/Civil finite elementmodels of Sichuan province Mianyang NO.1Bridge, through the analysis of themodel calculation constant load, the construction phase load, transverse wind load ofthe load, load, and settlement of bearing in the upper pedestrian bridge and the lowerthe car on the bridge deflection, the pedestrian bridge is obtained by rules of loadcombinations and dealership maximum pre camber of the bridge. Because the upperfootbridge material structure and force form the uniqueness of the pedestrian bridgetransverse linear changes significantly, according to the results of the finite elementsoftware calculation according to the similar calculation, in the process of the cambercalculation of pedestrian bridge transverse prestressing values.3. The use of mathematical software MAPLE, the dealership bridge girder camberbeforehand programming calculation, the calculation of the results of MIDAS/Civil,and get a certain cable-stayed bridge across the pre-camber to calculate generalprocedures. 4. Partial of double-deck cable-stayed bridge tower, upper pedestrian bridge andthe lower the car to the mutual influence between the bridge are analyzed andconcluded.