Construction Monitoring And Research Of Long-Span Rigid Continuous Frame Arch Bridge

The rigid continuous frame arch bridge has the advantages of large rigidity,beautiful appearance and strong ability to span,so it has been widely used in the constructions of high-speed railway in our country.The rigid continuous frame arch bridge is a combination of rigid continuous frame bridge and arch bridge,which not only possesses the advantages of rigid continuous frame bridge and arch bridge,but also has certain superiority in structure stress and service performance.In recent years,there are many successful examples of long-span rigid continuous frame arch bridge in our country,but the research on its monitoring technology is relatively weak.Regard the construction of the newly-built railway of the Shangqiu to Hefei to Hangzhou of the Fuyang main bridge(85+150+85)m rigid continuous frame arch bridge as background,paper carry on the practice and research to its construction monitoring,the main contents are as follows:(1)The MIDAS / CIVIL software is used to calculate the construction process of the Fuyang main bridge,then according to the results of the analysis obtain the construction segment of the formwork placing elevation and related data of the Fuyang main bridge.(2)The construction monitoring on the site of the Fuyang main bridge is carried out.By comparing the measured data of each construction stage with the theoretical one,it is concluded that the structural variant and internal force are within the error.And the alignment of the completed bridge is in line with the design requirements.The construction monitoring achieves good results.(3)Studying the effect of sunshine temperature on the main beam of the rigid continuous frame arch bridge and analyzing the effect of sunshine temperature on the maximum cantilever phase and on the closing phase of main beam.(4)Using the MIDAS/FEA software to study the local stress distribution of zero block in the rigid continuous frame arch bridge.Analyzing the local stress distribution of zero block in the maximum cantilever phase and the operating phase.The monitoring results of the Fuyang main bridge are as follows: grasp the rigid continuous frame arch bridge during the construction process of structural variant and internal force change rule,and provide a theoretical basis for on-site construction;the larger temperature difference of sunshine will have more pronounced effect on the main beam's structural variant and internal force,and the effect of sunshine temperature should be avoided as much as possible during the monitoring;The result of zero block stress analysis comes up with locations of possible cracks on the zero-block.