The Research On The Calculation And Analysis Method And Application Of Creep Of Prestressed Concrete Bridge

With the constant development of bridge construction in the modern society, analytical investigation on the structural internal force of prestressed concrete bridge has also become gradually matured. In the analysis of bridge structure, however, the influence of creep on the stress-strain of prestressed concrete bridge cannot be ignored. The research subject of this article is to propose a correction method on the calculating method of creep of common domestic specification.Although creep will exert beneficial or adverse impact on the performance of structure or component, the specific effect and degree of influence on creep cannot be qualitatively judged if excluding the influence of creep or ignoring the calculation method simply. On the one hand, excessive changes will occur on the structure or component of prestressed concrete as a result of creep. And the loss of prestress will greatly increase the adverse influence. On the other hand, the creep deformation calculation of preset bridge camber is regarded as a very important content to deal with the linear control and calculation of large-span prestressed concrete bridge. Therefore, it is a good direction of research in terms of calculation and analysis of creep so as to reasonably select a calculation pattern of creep and apply it into the creep analysis of structure correctively and effectively.On such basis, the following studies are conducted in this article: In the view of internal force analysis of prestressed concrete bridge, this article organizes the research results in related to the creep of component and structure at home and abroad, expounds the mechanism and influence factors created by creep, and summarizes the influence of creep's computing theory, calculation mode and creep on the stress changes and bridge line of component and structure. Based on analyzing the important influential factors of creep, this article probes into the sensitive issue of component creeping parameter. More specifically, it mainly analyzes the parameter sensitivity of creep, and studies the influence of parameter sensitivity of creep on the stress and linear structure of component.Based on the means of finite element analysis, and in combination of four creep calculation modes, this article calculates the creep of rigid frame bridge in the actual engineering, and analyzes the data obtained from four specifications. Besides, by applying the stress and displacement data, this article calculates the difference value corresponding to the element stress or displacement result of node of each group from four specification calculation results, and summarizes the influence of four specifications on the corresponding proportion of creep coefficient. Finally, according to the statistical result, the curves of four specification creep coefficients are fitted as a creeping coefficient curve. Based on the creep coefficient formula of JTGD62-2004 specification, this article compares the fitting creep coefficient curve to creep coefficient curve of original specification, so as to find out the required function relation, and takes it as the expression formula of correction factor.