Creep Of Concrete To Continuous Rigid Frame Bridge Camber Influence Research

Concrete creep is an inherent property of the concrete itself. From the concretebegan to bear load to the bridge from the stage of history, it runs through the wholeprocess of construction and use of bridge. Due to many factors affect the creep itself,the mechanism of complex bridge structure itself can not be ignored, nearly a centuryhas been subject to close attention from the engineering sector. Pre-camber is theamount of the offset beam bridge in its long construction and use due to variouscauses under the scratch in the formwork of the segments of the construction process,pre-raise. Concrete creep deformation compared to elastic deformation, creep undertorsion values in the project should lead to a high degree of attention. Article as astarting point, a study of concrete creep and under the influence of pre-cambersettings.First, abrief introduction to the nature of creep-depth discussion and summary ofinternal and external factors that affect creep, creep of the bridge and the impactmechanism;Then, introducing several international creep calculation method and calculationprinciples, methods and steps to make more effective and simple age adjustedeffective modulus method and finite element analysis method described in detaildescribed, several different creep coefficient of the structure and principles of thecalculation model;Then, the application of large bridges, finite element analysis softwareMIDAS/Civil Shandianjiang Bridge calculation model and creep model calculationsusing different bridge model under the influence of pre-camber values, the variouscalculated results with the construction process measured data were compared, thatour country highway reinforced concrete and prestressed concrete bridge designspecifications (JGT D62-2004) under the model with the actual situation is moreconsistent but still need to adjust the conclusions put forward how to choos the modeland make adjustment methods;Finally, the impact of China highway reinforced concrete and prestressedconcrete bridge and culvert design specitications (JGT D62-2004) in the creepcoefficient calculation model parameters from the perspective of the impact ofpre-camber, application Shandianjiang Bridge MIDAS/Civil computational model for instance checking,draw strength grade of concrete, environmental humidity and loadage larger conclusion, these parameters should be presented in the site visits,computational analysis and construction control more stringent treatmentrecommendations that considered thorough enough JGT D62-2004 model, the modelchanges in the future should this be taken into account recommendations.