Finite Element Analysis On Construction Process Of The Yellow River Bridge In Xi Gu

Combined with construction of fast, large spanning capacity and more economic and other advantages in the China girder cable-stayed bridge, has been widely applied in recent years, it can be said, composite beam cable-stayed bridge is one of the bridge of large span bridge is more competitive. Due to the complex structure of composite beam cable-stayed bridge is an indeterminate the cantilever erection construction, coupled with the unique technology, the cable force in the construction of the linear control, structure adjustment, construction assembly weight and construction load and design of bias and other factors, will be on the final shape of the bridge status and affect the distribution of stress. Because the main beam frame, beam, concrete bridge deck and other components in advance is a good pre prefabricated field, then the field of cantilever assembly, high strength bolt connection, therefore, strict construction control has become the key of composite beam cable-stayed bridge construction. In this paper, the west the Yellow River Bridge Based on the project, the following research has been done on the composite girder cable-stayed bridge static performance in the whole process of construction:Access to relevant literature, understand the origin, development and classification of combined beam of cable-stayed bridge, also introduces the characteristics of steel and concrete composite beam, the classification and the composite girder cable-stayed bridge the development status at home and abroad. The cable-stayed bridge is an indeterminate structure, construction stage stress are relatively complex, and has carried on the summary to the construction stage of the stress characteristics of the cable-stayed bridge and the law. Detailed description of the analysis of numerical method and construction process of the finite element equation.In XiGu of Lanzhou the Yellow River bridge engineering project as the background, according to the theory of the cable-stayed bridge structure design and construction stage, and its mechanical characteristics of cantilever erection construction technology, with the help of Midas Civil 2012 universal bridge finite element software, the establishment of the whole process of construction of the west the Yellow River Bridge finite element model, using the forward analysis method to determine the completion state reasonable, got into the moment, the state of the bridge under the force of cable and cable force. According to the least square method and the reasonable finished bridge state is minimum, so as to modify the initial cable force, and then a new round of forward calculation, until convergence, obtained the initial tension of cable bridge.On the construction process of the bridge static analysis of the system, analysis of the main tower, the vertical displacement of the cantilever erection construction of the main tower stress, vertical displacement of main girder, girder internal force, the stress of the main girder, bridge deck stress and the variation of cable force. And through the analysis of the various construction stages of structural displacement, internal force and stress changes, results show that: meet the requirements of the standards in the construction stage, structural safety, a main girder, tower and bridge deck bridge state should meet the requirement of bridge cable force, cable. In addition, under normal use, the two kinds of load combination, The bridge is calculated respectively in these two kinds of combination of action effects of load cases, the stress of the main girder, bridge deck stress, the main tower stress and safety factor of cable to meet the requirements of the relevant regulations, the structure stress is safe.