| Continuous rigid frame bridge has been widely used for it's convenience in construction. In practice, this kind of bridge could not be arranged symmetrically because of the landform and other factors; it needs to be arranged asymmetrically, so this kind of bridge is different from symmetry structure, such as structural stress, deformation of bridge, reinforcing bars, in construction and so on.Si nan yantou river bridge is a continuous rigid frame bridge which is under construction, the span arrangement and the height of the pier is asymmetry.This paper is regarding the real project as the research example to focus on stress and deformation performance of the Asymmetric span continuous rigid frame bridge, and compare with a symmetric span continuous rigid frame bridge which is same in main span and whole span. Compare with the cross-deflection, main tensile stress of the web plate, normal stress in span, we can get the general characteristic on the force and deformation of the asymmetric span continuous rigid frame bridge, then define the proportional limit of the asymmetric span division on the asymmetric span continuous rigid frame bridge.The following is the main work.(1) Based on the Midas/Civil software platforms, building its model by unit method simulation the process of bridge construction, and considered creep and shrinkage of the prestressed concrete to analysis the contact load and deformation of this bridge.(2) Build some model which has similar distributed steel, load on bridge, the same stage of construction but in different span, lead on certain conditions to assume so as to simplify the analysis. Then we can get and compare with the result in controlling some factors, such as cross-deflection, the main tensile stress of the web, the stress in bottom beam of the middle spans.(3) For the degree of the asymmetric arrangement of the span in continuous rigid frame bridge, we make a definition of the proportional limit of the asymmetric span division. |
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