Three Dimensional Mechanical Characteristics Simulation Analysis Of Single Tower Cable-Stayed Bridge

Cable-stayed bridge is a composite structure which consists of three principal components namely towers, girders and inclined cables. Inclined cables are the main bearing carrier, and the pre-tension of Inclined cables influence the stiffness, inner force and deformation of the whole structure directly. So how to use simulation analysis for construction sequences according to the construction program to get the reasonable initial cable forces is the key to gain reasonable inner force and evaluation of the structure in finished dead state. However, it is difficult to get reasonable initial cable forces because the cable-stayed bridge is a kind of structure with many redundant degrees.Compare with other form of beam bridges, the cable-stayed bridges have their own dynamic characteristics caused by wind, earthquake and moving motor load. Through the dynamic analysis, it can reveal the structure inner force and deformation under the effect of vehicles more truly and figure the structure response caused by earthquake action.What's more, transverse beams can't be neglected in design. The correct analysis and computation has been an important part in the entire design. This thesis focuses on single tower rigid-frame system cable-stayed bridge and analyzes the influence of middle transverse beam's stiffness on the inner force of the structure.On basis of other people's work, this paper takes Sanya Hongsha Bridge for example and use three dimension finite software to study the three problems mentioned above. The main contents and conclusions of this thesis are as follows:(1) Reasonable cable tension in the finished dead state gained by use minimum bending moment of the girder and influence matrix method.(2) The simulation analysis for construction sequences proved the problem that there is a big discrepancy between the results from backward analysis and forward analysis. Then it used forward iteration method to adjust the initial cable forces. Finally a set of reasonable initial cable forces have been gained.(3) The inherent vibration features of this bridge get from the inherent vibration analysis.(4) The seismic response spectrum analysis indicated that the bottom of tower and location which girder connect to the tower is the key part of vibration-resistant; More...