Effect of Shrinkage and Creep on Self-Anchored Suspension Bridge
|School||Southwest Jiaotong University|
|Course||Bridge and Tunnel Engineering|
|Keywords||Self-anchored suspension Concrete Shrink Creep Initial Strain Method Redistribution|
Because self- anchored suspension bridge main cables are anchored in the stiffening beam , using reinforced concrete or prestressed concrete members self-anchored suspension bridge, and the bridge tower stiffening girder shrinkage , creep inevitably lead to the main cable and sling force changes , resulting in structural internal force and the fulcrum reaction force redistribution and structural linear changes in the structural design must be considered when the impact of shrinkage and creep . In a brief paper on the mechanism of creep and shrinkage elaborate , based on the old highway bridge on the domestic norms shrinkage and creep mode and structural effects of shrinkage and creep analysis methods were analyzed and compared ; thesis initial strain method, derived considering concrete loading age structure effects of shrinkage and creep finite element analysis of expressions and using FORTRAN language computer program ; thesis self programming on the shrinkage and creep effects analysis of a number of key issues were discussed , analysis shows that the new norms and old specifications are quite different creep secondary effects have a significant impact on the structure , shrinkage and creep effects analysis and calculation time step should be a reasonable value , shrinkage and creep termination time for a specific form and structure . Thesis, a single-span suspension single tower self-anchored suspension and a single tower and two self-anchored suspension span suspension program , for example, after the bridge into the structural shrinkage and creep effects analysis, research on the effects of shrinkage and creep of concrete structures affected. The results showed that concrete creep and shrinkage effects on the self-anchored suspension line than on the more significant the impact force ; increase the age of the concrete can be more effective in controlling shrinkage and creep adverse effects on the structure ; concrete creep and shrinkage the impact of the structure is a long process, should be based on the specific form of the structure to determine a reasonable calculation of creep and shrinkage effects of termination time ; single-span suspension for single-tower self-anchored suspension or unequal span self-anchored suspension bridge, you can By setting the saddle to the main bridge into a pre- biased amount or adjusted after the bridge saddle longitudinal position of the main ways to effectively control the shrinkage and creep of concrete on the bridge tower adversely affected.