Construction Control And Transverse Internal Force Analysis Of Wide Cross Section Single Box Single Chamber Continuous Beam Bridge

In order to meet the needs of traffic modernization, highways and bridges tend to be multi-lane, and the lateral width of single bridge is rising. Meanwhile, for the improvement of bridge structural simplification and construction convenience, among prestressed concrete beam bridges at home and abroad, those which adopt the formation of large cantilever single box single chamber wide box section fit for wide bridges are becoming more and more. For prestressed concrete continuous beam bridges by cantilever construction, especially wide cross-section single box single chamber continuous beam bridge, in the process of construction, there exist lots of uncertainty factors which would lead to the big difference between structure construction, finished bridge state and design requirements. Therefore, it’s quite essential to do the construction control of wide cross-section single box single chamber continuous beam bridge well. Simulation analysis of the construction phase of the bridge construction control is carried out by the finite element plane trussing calculation. In order to fully understand mechanical characteristics of wide cross-section single box single chamber continuous beam bridge, it is necessary to make the transverse internal force analysis.This paper takes the host bridge of QingMei Bridge in MuDanjiang city as the engineering background, focuses on the research on geometric deformation control, stress control, and closure construction control in construction control of wide cross-section single box single chamber continuous beam bridge, and makes an analysis on the transverse internal force characteristics of wide cross-section single box single chamber continuous beam bridge combined with some other different cross-section forms. As follows:(1) In the process of construction monitoring, the paper makes the construction process simulation analysis by formal analysis method using Midas/Civil finite element analysis software on the structural characteristics of host bridge of QingMei Bridge. The prediction method based on LS-SVM which is not commonly applied in the construction monitoring of continuous beam bridge is employed in the prediction of elevation error. Good prediction effects have been achieved. Compared with grey system theory and BP neural network prediction results, the prediction accuracy based on LS-SVM is higher, which indicates that it’s feasible for this method to be applied in construction control. This paper makes a detailed discussion on stress monitoring results, and then stress changes characteristics in the construction process of wide cross-section single box single chamber continuous beam bridge are captured. This paper elaborates the key issues in closure construction control.(2) When performing transverse internal force analysis, this paper does the lateral bending moment calculation on mid-span section,1/4section of host bridge mid span of QingMei Bridge and three kinds of continuous box girder section based on mid-span section by using elastic support framework method, and then comprehensively analyzes the transverse internal force state of wide cross-section single box single chamber continuous box beam bridge according to transverse bending moment calculation results of different sections.This paper adopts effective methods in the analysis of implementation of construction monitoring and transverse internal force, and good results have been achieved. This paper provides references and basis for the analysis of construction control and transverse internal force of wide cross-section single box single chamber continuous beam bridge.