The Construction Control Simulation Calculation Of Higher-Lower Tower Cable-Stayed Bridge

The cable-stayed bridge is an indeterminate structure with high degrees, the construction method is closely related to the internal forces state and shape of the bridge. Because of the influence of various undefined factors, the structure force and deformation in the construction stage is a complicated stochastic process. So the construction control of large-span cable-stayed bridges becomes an important research subject. The construction control simulation analysis of cable-stayed bridge is an accurate process of simulation analysis the force and deformation of construction and completion stages through reasonable model namely and taking effective structural analysis method. No matter what control theory is used in the actual construction, taking felicitous simulate analysis method is the key to ensure the precision of construction control and the construct progress.The second Wujiang Bridge in Fu Ling is a higher-lower tower cable-stayed bridge, this paper taking this bridge as background, by using large scaled finite element analysis software Midas/Civil to establish dimensional finite element models, analytical calculated the construct process. The main contents and conclusions of this thesis are as follows:(1) The reasonable design state is determined by the minimum bending energy method and cross interaction matrix, the results are satisfactory. It indicates that determine the reasonable design state of cable-stayed bridge comprehensive consideration this two theoretics is an ideal method.(2) The initial cable forces are gained by the forward iteration method, then modified the difference using least square method. The finished cable forces are consistent to that of the target state basically. get through a few of iteration, the maximum error was 1.2%. This indicated determinate the construct state of cable-stayed bridge by it are reasonable and effective.(3) Based on the structural feature of the front-support hanging-basket, analysis the stress under kinds of condition. After comprehensive consideration the stress of the hanging-basket and safety of the main girder, the range of batched tensioning force are determinate.(4) For the structure which constructed using cantilever method, for the sake of the line shape meets requirements, one of the important contents of construction control is confirm the elevation of main beam segments. This paper calculated the theoretical value, it is the target value of construction control.(5) The construction of cable-stayed bridge is a process influencing by several parameter. For the sake of finding the main aspect during the construction control, this paper analysis the sensitivity of some parameters, the result indicates the beam weight, the initial tensioning force, the shrinkage and crape of concrete are prominence, so these parameter must be control strictly during the construction.