Research On Construction Monitoring And Temperature Effect Of Prestressed Concrete Continuous Rigid Frame Bridge

Recently, with rapid development of the national economy and the modernization of transport, the bridge performance requirements become more extensive. Prestressed concrete continuous rigid frame bridge has become the leading type of the widest longspan bridge in china, due to minimum structural deformation, rigidity, driving comfort, less expansion joints, simple maintenance and seismic capability. Moreover, the construction method of the bridge is relatively simple. Compared to the same span arch bridge, it cost lower. Therefore it is particularly suitable for undulating terrain mountainous geography. In order to ensure the safety of the construction and the connection between the design idea and the completion state, bridge construction monitoring has been included in the important work of the bridge in construction management. In this paper, the author will study in construction monitoring and temperature effects of concrete continuous rigid frame bridge according to the theory combined with the actual project. The main contents are as follows:1. Based on summarizing the method of construction control for various bridge, adaptive control method used in Prestressed Concrete Continuous Rigid Frame Bridge construction control is researched. The whole process of construction is simulated and analysised via Midas/Civil finite element software.Formal calculation method is used to simulate and analyse the construction process. And the least squares method is used to identificate and correct parameter error.2. The sensitivity of main design parameters are analysised for cantilever site pouring prestressid concrete continuous rigid frame bridge construction process. And the main model parameters are tested and regulated pertinently according to analysis of various parameters on the influence of the structural state.3. Deflection and strain observation points are arranged to implement the alignment and stress monitoring in bridge engineering.The comparison between the measured data and the theoretical date is analysised to validate the simulation accuracy and construction monitoring and analysis results.4. Under the engineering background of Guian Bridge, the sunshine temperature effect on the structural alignment and stress is analyzed in the cantilever construction of the prestressed concrete continuous rigid frame bridge, the temperature effect on the structural alignment and stress is analyzed in the finished bridge state According to the results of the analysis,the most suitable temperature of closure for this bridge is put forwarded.