Linear Research Control Of Long-span Prestressed Concrete Continous Rigid Frame Bridge

At present, a lot of long-span bridge construction by the cantilever constructionmethod, but the cantilever construction process more time long, cold in wintertemperature in northeast China, from the economic into consideration, long-spanbridge cantilever construction can be divided into two years period, the suspension ofconstruction in winter, the current domestic few winter to suspend the construction oflong-span Bridges, long-span continuous rigid frame bridge with the winterconstruction monitoring and seldom research literature. Domestic has been built in thestage of long-span continuous rigid frame bridge is in use across constantlydownwarping phenomenon caused more and more people to the attention of the maingirder elevation control in the construction process, main girder cantilever segmentsduring winter break in the creep and shrinkage of concrete prestressed loads ofelevation changes affect the subsequent elevation control beams, joining into thebridge linear, closure segments elevation and the elevation of using phase, for largespan continuous rigid frame bridge construction in the process of the linearmonitoring is very important.Based on changbai mountain international tourism resort north bridgeengineering bridge no.1(main span prestressed concrete continuous rigid framebridge) based on the project, mainly to complete are: the content of the finite elementanalysis software of structure analysis and calculation, and the comparative analysisof calculation results through different software; And adopt formal analysis method tocalculate the each segment of the girder elevation design, simulation analysis duringthe winter break girder elevation changes; And stent preloading test by hanging basket,established the hanging basket of the relationship between the deformation and loadcurve, in construction process to analyze the causes of deformation of hanging basketerror, fixed hanging basket deformation value and tracking measurement in theconstruction process, to ensure that the correct guiding the model level; Set up thebottom of the beam and beam top elevation control network, effective to monitor the main girder elevation, in construction process to influence the parameters of the maingirder elevation correction, ensure the girder elevation in manageable; Relying on theproject for the bridge static and dynamic load test, test the stress and deflection ofbridge control section and Bridges inherent structural parameters, to ensure the qualityof bridge construction, and used as a bridge during the matters needing attention areput forward.By relying on engineering effective monitoring, ensure the smooth closure of thebridge finally into bridge accord well with those of linear and design linear; Throughto the main girder elevation changes before and after the winter break of actualmeasurement, to determine the winter the influence of the large continuous rigidframe bridge girder linear; Through the project into bridge static and dynamic loadtest, ensure the quality of the construction of the bridge. By relying on engineeringconstruction monitoring process and results of analysis and research, get some usefultheory can offer Suggestions to the construction of the same kind of Bridges.