Research Of The Effect On Shrinkage And Creep Of Concrete Of Self-anchored Suspension Bridge

In the context of reducing national energy consumption and infrastructure investment,concrete materials are increasingly being used in the self-anchored suspension bridge which isthe new tpye in recent years. As main cables of the self-anchored suspension bridge areanchored to the girder, there is always tremendous pressure on the main beam during thewhole construction and operation process. Concrete shrinkage and creep effects on theself-anchored suspension structure properties effects seem more apparent. Therefore, theconcrete shrinkage and creep characteristics on specific environment and componentmaterials have been tested; the study of concrete shrinkage and creep effects of theself-anchored suspension bridge has been carried on. The main contents are as followings:First of all, by the means of concrete shrinkage and creep mechanism and the affectingfactors, detailed analysis of shrinkage and creep of self-anchored suspension bridge as well asthe other adverse effects of the concrete structure are made in the essay.Secondly, through on-site model test and compared to several concrete shrinkage andcreep law of development and convergence trends on the basis of the existing norms ofshrinkage and creep strain of the mathematical expression, the concrete shrinkage and creepprediction model is made by using of1stOpt numerical analysis procedures so as to fit out tocalculate the correct design and construction control of shrinkage, creep parameters, state ofthe real bridge as well as improve long-term forecast accuracy.Then, through the establishment of independence, self-anchored suspension bridgetowers finite element model, the specific impact of the bridge suspension bridge structureanalysis of performance of three main factors of the two self-anchored suspension bridge andthe force of the linear parameters are made, the influence of three major factors of the maincable and stiffening girder alignment and internal forces are revealed. Two bridge-shapedconcrete calculation shrinkage and creep loading time and the termination age of therecommended value are proposed by the comparison of the main tower displacement, boomforce and reaction force of law, comparative analysis of shrinkage and creep of concreteself-anchored suspension bridge for the two effects.Finally, on the basis of test result of on-site components and a combination of twoself-anchored suspension of the finite element method, the main beam for long-term effectiveprestress state analysis of the impact is drawn out and then proposed method of reducing theloss of prestress is stated so as to verify the effectiveness of the above method.