Study Of Mechanical Properties On Steel And Concrete Composite Cable-Pylon Anchorage Zone Of Cable-Stayed Bridge

Modern cable-stayed bridge is developing towards the direction of long span. As the span increases, the pylon becomes higher and higher. This makes the work of design and construction, especially concrete pouring become rather difficult. On the other side, using the steel pylon which has better mechanical performance will greatly increase the construction cost. So it is more economical and rational to use the steel-concrete composite pylon in cable-stayed bridge. Generally speaking, pylons of cable-stayed bridge using this kind of structure can be divided into two main styles:steel anchor beam, and steel anchor box.Anchorage zone of pylon that using steel anchor box exists many problems. Such as big load, small space, complex structure, numerous path of force transfer, uneven distribution of stress, complex failure mechanism and so on. This paper studied the mechanical properties of such kind of anchorage zone based on the project of Sutong Bridge.The thesis first introduces the1:1segment model experiment of the33th segment of Sutong bridge’s anchorage zone, describes the experiment procedure and results, then uses international finite element software ANSYS to establish the element model, calculate its displacement, stress and mechanical properties under design cable tension, and finally contrasts and analyses the calculation result with model test result, clarifies the anchorage zone that using steel anchor box’s stress characteristics and the transfer mode of cable tension.In the next section, in order to verify the safety of the use of single segment test result to analysis the real bridge, multi-segment finite element model of cable pylon was established and calculated. By comparing the calculation results of multi-segment and single segment, it can be seen that all the single segment’s calculation results are bigger than the multi-segment’s. So it is safe to use single segment model as a representative of real bridge’s force condition.The calculation results and conclusions provided by this paper have a reference value for the design of cable-pylon anchorage zone of Sutong Bridge and also offer significance for other similar anchorage zones’design and research.