Long-span Cable-stayed Bridge Deck Linear Adjustment Technology Research

Cable-stayed bridge as a strong spanning ability, economic and beautiful bridge style,which has been rapidly developed in recent years. According to the incomplete statistics, in the past 50 years, the whole world built more than 300 seats of long-span cable-stayed bridges. Due to the structural characteristics, the using the complexity of the conditions as well as the unperfectly of the maintenance technology of the cable-stayed bridge, all of these lead to a variety of diseases appeared in the stayed bridges. Among these numerous diseases, changes of bridge deck line in the operational phase is the most serious one. Bridge deck line in cable-stayed bridge in the operation process has extremely important significance, both the bridge's structure safety and life and the driving comfort and safety will be directly related to the change of bridge deck line.The cable-stayed bridge's development and the primary diseases in the operational phase of oblique stayed bridge as well as the main reasons which caused these diseases were briefly described in this paper. Based on describes above the text and the engineering example of the Second Chang Jiang River Bridge in Wuhan, this paper proposed nonlinear stochastic static analysis method on account of the BP neural network of the oblique pull bridge. And then analysis and research the the main factors and the influence rules which affected Large span cable stayed bridge. and on the other hand, according to the training,this paper obtained the adjusted BP neural network of Wuhan Yangtze River Bridge midspan deflection and introduced a new method-- fuzzy iterative algorithm based on neural network for determining cable stayed bridge of reasonable cable force. This paper took the Wuhan Yangtze River Bridge as example to calculate cable stayed bridge Rational Completion Cable Force, and then took the force compared with the other forces obtained by the zero displacement and bending energy methods. And then analyzed of its advantages and disadvantages. This paper researched that the cable force values in neural network considered along with the time changed played a guiding role in the operational phase of the cable stayed bridge cable force adjustment simultaneously. At last,this paper presented the implementation schemes of the Wuhan Yangtze River Bridge Deck alignment adjustment according to the front of the theories, and the theory calculation shows that, this project could fully and effectively solve the problems of the shifting of cross middle and lower torsion as well as the cable support tower.