Study On Composite Structure Of New Cable-stayed Bridge With Giant Wheel

Cable-stayed bridge is a cable-supported structural system consisted of pylon, girder and cable. Because of the advantage of perfect load-carrying performance, large-spanning ability, structural novelty and diversity pattern, it has been developed quickly and applied widely. Giant wheel as a pleasure facility has been rapidly expanded in the world since the first giant wheel comes into the world in Chicago in 1893. The bridge and the wheel have been united into one structure in the subject investigated of this paper. And a creative structural system has come into being—the composite structure of new cable-stayed bridge with giant wheel. Around the new structural system, the following work has been done.The history and the trend of development of the cable-stayed and giant wheel have been presented. And present state of the study on the static, dynamic and aseismatic behavior of cable-stayed is analyzed. Then the background and the main work of this paper are put forward. Base on the analysis of the source of geometric nonlinear factors of cable-stayed, the method coped with each geometric nonlinear factor is presented. Also the method of solving the nonlinear equations is discussed.The influence of geometric non-linearity on the static characteristic of the composite structure of new cable-stayed bridge with giant wheel has been studied. A three-dimension model incorporating the sag of cable, large displacement of structure and the effects of beam-column has been developed. The comparison of two supporting systems is done and a rational one is confirmed. Base on the confirmed supporting system, the effect of each nonlinear factor on the behavior of the whole structure is discussed under the action of a certain load case.Analysis on dynamic characteristic of the composite structure of new cable-stayed bridge with giant wheel has been performed. The process of achieving the dynamic characteristic of the structure by finite element method is deduced. And the implementation way in ANSYS is advanced. A model for dynamic analysis is established and then the natural frequency and vibration mode of the new cable-stayed bridge, the giant wheel and thewhole structure is obtained. Also the trait of the dynamical performance of the structure is discussed.Seismic response analysis on the composite structure of the new bridge with giant wheel incorporating the geometric non-linearity has been done. Three methods for analyzing the structural response under the action of earthquake are summarized. And the emphasis is put on the procedure of the time-history method, which includes the input of seismic wave, the establishing and solving of vibration equations. Also the method of realizing method in ANSYS is brought forward. Then the seismic response of the composite structure is analyzed by inputting Tianjin wave in the longitudinal direction and the displacement and force response of the structure is achieved.Analysis of the new cable-stayed bridge with giant wheel during construction is made. The general analytical method of cable-stayed during construction is overviewed—forward process analysis and backward process analysis. Then based upon the principle of the backward process analysis, analysis of the structure in a certain state during one construction procedure is done and the existed problem is indicated. Also an improved measure is put forward. At last the construction method of the giant wheel is discussed.