Analysis Of Long Term Deflection Factors Of Long-span Prestressed Concrete Continuous Rigid Frame Bridge

The long-span prestressed concrete continuous rigid frame bridge has gained advantages in the construction of large-span bridges in China due to its scientifically accepted,convenient construction,smooth passage,ideal stiffness environment and ideal performance.More use.In the process of analysis,based on the construction of such bridges,the Midas finite element method is used to carry out targeted research activities on the influencing factors of the downward deflection,so as to guide the subsequent engineering practice activities.The key points in the analysis of the paper are:(1)Analyze the basic evolution information and trends of rigid frame bridges,and also carry out targeted analysis work on the problem of downward deflection.(2)Exploring the basic principles of shrinkage and creep and the prediction schemes adopted by various countries,using a variety of standardized model schemes to organize the effects of shrinkage and creep on the deflection parameters of the overall bridge.(3)Study the influence of prestress loss on the overall deflection parameters,the key factors are the effects of elastic compression and relaxation.(4)Based on the effective reduction analysis of the section,local and full bridge stiffness data,the influence of the crack on the overall deflection parameters can be discussed.(5)Study the influence of various non-deterministic factors in the construction process on the deflection,covering the effects of actual loading age,self-weight,settlement and operation.