Research On Construction Control And Transverse Stress Analysis Of Multi-span Asymmetric Continuous Girder Bridge

In recent years,with the focus of transportation development gradually shifting to rural area,the development of bridge construction and the improvement of prestressing technology,in order to overcome the difficulties like complicated terrain and landform,and poor engineering and hydrogeological conditions,multi-span asymmetric continuous beam bridge was more and more widely used in engineering.The characteristics of this bridge – large span,large number of span,asymmetry – lead to the deflection,stress and other parameters of the main beam structure changing as construction progresses.In order to ensure the bridge linearity of the continuous beam bridge and the safety and stability of the structure in engineering,it is important to do stress analysis during construction and after completion of the bridge.This paper researched on Chudu Avenue Crossing Haizi Lake Bridge.Theoretical analysis,modeling calculations and data verification were used to study the construction control and force analysis of a multi-span asymmetric continuous beam bridge.The main research contents and conclusions are as follows:(1)The finite element software Midas / Civil was used to carry out the whole bridge modeling and calculation analysis according to the construction background and related design parameters of Chudu Avenue Crossing Haizi Lake Bridge.Through the analysis of the calculation results,the force and deformation characteristics of the asymmetrical section P1-P5 pier during construction were found.The relationship between the deflection and stress of the bridge during construction was summarized.Meanwhile,the actual measured values during the bridge construction were compared,and the correctness of the calculation model was verified.An analytical model and data support were provided for related research in this paper.(2)The change law of concrete shrinkage and creep on the stress of prestressed concrete continuous beam bridge during operation were studied,analyzed,and compared with the effects of shrinkage and creep on a three-span symmetrical prestressed concrete continuous beam bridge.The relationship graphs of deflectiontime,stress-time and other parameter developed over time on the multiple sections were obtained.The research results have positive significance for the in-depth study of concrete shrinkage and creep theory.(3)The finite element software Ansys was used to model the bridge deck.The technical problems of double-connected bridge decks deformed by various loads during operation was studied,especially the key technical issues of lateral stress and deformation in the case of the second-phase dead load,temperature load and the most unfavorable vehicle load.The internal influence relationship between corresponding parameters was obtained to provide references for the design and construction of similar bridges.(4)Sensitivity analysis of impact parameters of multi-span asymmetric continuous girder bridge structure’s was implemented on the model of Chudu Avenue Crossing Haizihu Bridge generated by Midas / Civil.The influence of the adjustment of the model design parameters on the stress of the main beam,the rear bridge deck and other components of the bridge during construction was studied.The internal relationship between parameter changes and force effects was revealed.The foundation for further research on correction and feedback control in similar bridge construction control was laid.