Simplified Mode Of Temporary Consolidation And Closure Error With The Linear Bridge On Effect Of PC Continuous Bridge Cantilever Construction

In the PC continuous beam bridge construction process, often need to ensure bridge construction control line of the main beam. In this paper, with three-span continuous beam for engineering background, using bridge proprietary software Midas/civil establish bridge structures’ computational analysis model. For control of cantilever placing construction,pier-girder temporary consolidation relevant issues, additional pressure on the structure and re-calculated after linear effects for Bridge have a certain amount of analysis and exploration. Mainly to complete the following work and draw relevant conclusions:(1)On the basis of access to relevant information, understanding the development process of continuous prestressed concrete beam bridge and cantilever placing construction features, and for the construction of temporary consolidation, determine and implement measures of counterweight make a investigation.(2)For temporary consolidation force analysis problems in the computational model, through the study of temporary consolidation of simulation method in the rod system model, exploring its impact of the structural state in the different construction stages.(3)On the basis of calculation and analysis of the temporary consolidation of the elastic support stiffness, with the corner of the main beam stiffness reference, Discussion temporary consolidation stiffness’ and the pier rigidity’s affect of the main beam deformation during the conversion of the system. The results show that temporary consolidation is an elastic connection, articulation and consolidation is its two limit state, when the pier with beam’s angle stiffness ratio is large, the impact of bridge piers can not be included calculating in the construction control.(4)On the basis of forced closure on the analysis of the role of engineering measures, for relative height’s phenomenon of the two ends of the closure section during the construction. according to two kinds of closure order, Respectively the corresponding force is calculated,and derive the corresponding bridge beam deformation equation after being forced into a bridge closure. And through an engineering instance,those are verified with finite element, The results show that closure error is greater, the force required for the construction is larger, and beam line is more largely affected after being forced into a bridge.(5)Through the establishment of a numerical model of forced closure, To investigate linear structural changes due to the impact of closure error during bridge closure phase, two dead load pavement stage, after three years of creep. The results show that consistent displacement trend on the symmetrical cross-section after being become bridge, that is increasing with time; Beam’s line is largely affected because of closure errors on the bridge closure phase, after two dead load is applied, its impact is reducing, three years after the completion of shrinkage and creep, linear changes of the beam have been becoming stable, and the main beam’s displacement abnormal value caused by the closure error still exists, it will not be alleviated or eliminated due to creep of concrete.Through analysis and comparison of the two closure order, we discovery that closing the main span after closing the first side span, the beam linear within the main span is affected greater than the side span; while closing the side span after closing the first main span, the beam linear within the side span is affected greater than the main span.