Study For Spatial Mechanical Behaviorof Cable-Stayed Bridge With Separate Steel Box Girder

The cable-stayed bridge is an indeterminate structure with high degrees and its force is more complex. The cable-stayed bridge is developing from single desk to double desk. The increase of the number of box girder inevitably results in the necessary cross-linking between the two box girders, so that the components of cable-stayed bridge with twin desks is more prominent and its transverse force becomes more complicated. Due to the increase in the number of box girder will result in the increase of cable plane, the force characteristics of cable-stayed bridge with twin desks is Particularly obvious. Study for the sPatial properties of multiple cable plane cable-stayed bridge with twin desks precisely and pecial mechanical characteristics will be conducive to multiple cable plane cable-stayed bridge with twin desk, making it a reasonable state. Moreover, multiple cable plane cable-stayed bridge with twin desk will be better guided in terms of design, construction and construction monitoring work. This shows that the study of multiple cable plane cable-stayed bridge with twin desk contains great theoretical and engineering application value. The thesis mainly focuses as follows:(1) The effect of asymmetric lifting in the framing lifting and the overall lifting to the girders and the main tower was studied respectively. And the optimal lifting program of cable-stayed bridge with four cable planes and seParated twin-decks was raised.(2) The four scheme was proposed for the inside and outside cable force distribution. The change of stress in main girder, crossbeam, tower, tower offset and the change of transverse slope in beam are studied in the four scheme so as to ultimately make the optimal scheme for the inside and outside cable force distribution.(3) The finite element sPace model was built up by MIDAS/Civil to study the optimal time of installation and dismantling of temporary beams of Jia Shao Bridge.