Study On Reasonable States Cable Force Of The Double-Tower Cable-Stayed Bridge With Asymmetrical Type And Program

the structure system of the high and low towers cable-stayed bridge, takes single central cable plane and asymmetrical type, is novelty ,and the strength behavior of two-towers cable-stayed bridge is different from other traditonal two-towers cable-stayed bridges. In order to understand the strength behavior characteristic like this type the rational completion state.At the same time ,compile the cable-stated static program to solve the problem.this paper taking this bridge as background, by using finite element analysis software Midas/Civil to establish dimensional finite element models, analytical calculated the rational completion state.The main contents and conclusions of this thesis are as follows:1) The reasonable dead loads state is determined by the minimum bending energy method and cross interaction matrix, then modified the difference using least square method. This paper applied to determine the state under live loads.It indicates that determine the reasonable design state of cable-stayed bridge comprehensive consideration these theoretics is an ideal method.2) The initial cable forces are gained by the forward iteration method, then modified the difference using the difference method. The finished cable forces are consistent to that of the target state basically. Get through a few of iteration, this indicated determinate the construct state of bridge by it are reasonable and effective.3) The rational completion state of cable-stayed bridge is a process influencing by several parameter. For the sake of finding the main aspect ,this paper analysis the sensitivity of some parameters, the result indicates the beam weight, geometric non-linearity,the shrinkage and crape of concrete and temperatureare prominence, so these parameter must be considered during the rational completion state .4) Based on plane bar finite element, Ideal completed structure is deterinined by erect matrix method with choosing the strain energy of the structural system as optimum aim. Ideal state of construction is determined by forward-running analysis. Based on these theories and methods, construction control of cable-stayed Analysis System is developed by using object oriented programming tools, Visual Basic and Visual Fortran as tool. This program make the reasonable state of cable-stayed bridge become more convenience at any time.