Fatigue Research Of The Cable Under Truck Loading And Analysis Of The Anchorage Zone Of Cable Tower On Partially Cable-stayed Bridge

Partially cable-stayed bridge is also named low pylon cable-stayed bridge, which emerges up as a new conception of bridge styles, with low pylon, rigid beam and concentrative cable as its special characteristic. Partially cable-stayed bridge is a style between continuous bridge and cable-stayed bridge, of which structure and system are very variable, with a good combination of flexibility and stiffness. Since the first partially cable-stayed bridge named Odawara Port Bridge completed in Japan in 1994, the bridge style becomes fashionable and favor of bridge engineers in Japan and other countries because of its particular predominance.As a new bridge style,however, the theory of design and calculation is not yet perfect, and the analysis of key part is not yet deep.Therefor,analyzing the mechanical capability of partially cable-stayed bridge, especially doing deep research on its key part has important academic significance and applied value to offer gist and reference for the design of partially cable-stayed bridge.The thesis is accomplished in the very background.The author takes the main bridge of He Ma Xi extra-long bridge of Jiang-Zhu thruway for example, which is a partially cable-stayed bridge with twin tower and single cable plane, takes use of MIDAS to establish a model of the whole bridge, in the service stage, analyses the alternating stress of cables under the vehicle load, the fatigue situation of cables, forecast the life span of partially cable-stayed bridge based on the fatigue of cables by linear accumulative damnification theory, and analyses the allowable stress in design of partially cable-stayed bridge. From the anchorage zone of cable tower, which is key mechanical part of partially cable-stayed bridge,the author uses ANSYS to establish run-through touching model of cable and tower, researches the impact of balanceable pull, imbalanceable pull,cable angle and able saddle radius of the cable beside the main tower on the anti-slippage capability by analyzing the ant-slippage capability of the anchorage area of cable tower.According to the result of the analysis, the thesis draws a conclusion of forcasting method of the life-span of partially cable-stayed bridge based on cable fatigue, offers gist and reference for the fatigue and life-span design of the cables of partially cable-stayed bridge, brings forward some feasible opinions of anti-slippage measures design of cables of run-through cable tower anchorage of partially cable-stayed bridge.