Effect Of Shrinkage And Creep On Self-Anchored Suspension Bridge

Because the self-anchored suspension bridge adopts reinforced concrete or prestressed concrete members and its cables are anchored on the stiffening girder, the shrinkage and creep of stiffening girder and bridge tower should induce the changes of internal forces of cables and hangers, which results in the redistribution of action effects and reactions and the transformation of structure state. So the influence of concrete shrinkage and creep must be taken into account in the design of structure.The thesis briefly presents the mechanism of shrinkage and creep, carries on the analysis and compare on domestic patterns of shrinkage and creep and the analytical methods of structural effects of shrinkage and creep; the initial strain method is adopted in the thesis to deduce the finite element expression of shrinkage and creep effects on the structure while taking the age of loading into account, and programme be written by FORTRAN language; the thesis carries on the discussing of the key problems in the effects of shrinkage and creep using this programme, the analysis indicates the differences between the new code and old code, the second effects of creep have great influences on the structure, the time steps while calculating the effects of shrinkage and creep should be reasonable, and the end time of shrinkage and creep is related to the idiographic types of structure.The thesis takes the two patterns of self-anchored suspension bridge with single tower as examples to carry on the structure analysis of shrinkage and creep effects after bridge finished. One is hung in single span and the other is hung in two spans. The results indicate that the shrinkage and creep effects have greater influences on the shape of the self-anchored suspension bridge; adding the age of concrete can effectively control the adverse influence of shrinkage and creep to the structure; it is a long-term course of shrinkage and creep influence on the structure, the reasonable end time of shrinkage and creep should be determined according to the idiographic types of structure; the ways of setting pre-eccentricity of main saddles or adjusting the lognitudinal position of main saddles can be applied to control the adverse influence of shrinkage and creep to the bridge tower effectively.