Reserach Of Construction Control Technology For Long-span Continuous Rigid Frame Bridge In Plateau-cold Region

With the development of economy, the bridge’s span and constructionrequirements are also rising as the important traffic lifeline project in modern life. Inmany types of bridges, continuous rigid frame bridge is a bridge to use more. Not onlybecause of its large span, but also construction is convenient and the technology ismore mature.In recent years, with the continuous progress of the constructiontechnology of continuous rigid frame bridge, cantilever pouring are widely used inpractical engineering as a continuous rigid frame bridge construction method.In the process of the cantilever construction, the bridge structure has changedfrom static structure to the process of hyperstatic structure, so in the constructionprocess should pay attention to the construction process monitoring on the bridgelinear, internal force and deflection and other factors, in order to meet therequirements of bridge structures. With the increase of continuous rigid frame bridgespan, the effection of temperature changes to the internal force and alignment of thebridge deflection. Especially the influence of solar radiation and temperature changesin the bridge structure are larger. For the cantilever casting of long span continuousrigid frame bridge, the temperature change effect when closure is extremelyimportant.Based on the above reasons, this thesis simulates and analyses usingMIDAS/CIVIL software on the background of black river bridge. the main contents ofthis paper are as follows:1） The modeling analysis of the black river bridge is carried out byMIDAS/CIVIL software, firstly, carry on static analysis on it to achieve the stressstrain situation in different construction conditions.2）Since the Black River Bridge is located at Qinghai alpine areas, the effect oftemperature changes in the process of construction to the construction progress islarger. through calculation and analysis of the closure temperature of Black RiverBridge using MIDAS/CIVIL software in this paper.3）The actual monitoring of black river bridge, and the analysis of monitoring data, verify the accuracy of monitoring results.