Continuous Rigid-frame Bridge Construction Monitoring Analysis

In recent years,With China's comprehensive national strength and the rapid development of transport,Have built a lot of prestressed concrete continuous rigid-frame bridge.Because the increase of construction difficulty,Therefore, in the construction process have also been many problems can not be ignored, Construction Monitoring which is particularly prominent deflection and stress.Prestressed concrete continuous rigid-frame bridge construction process control is to ensure the construction quality and safety, Is to ensure that the stress state into the bridge line and an important measure to meet the design requirements.The basket Cantilever continuous rigid-frame bridge construction, construction of the main basis for monitoring the deflection of the structure, stress, temperature, etc. in real-time observation and structural parameters of modified model, To predict the next segment deflection of the construction and structure of stress, achieve the final design of the state to ensure the bridge structure into the bridge line and stress to meet the design requirements.In this paper, Qing Lan Speed Shi Wang River prestressed concrete continuous rigid frame bridge, its highly successful construction monitoring and stress research, the main contents and results are as follows:1,The generation of continuous rigid frame bridge and structural features were analyzed and summarized the domestic and bridge construction monitoring technology development status, pointing out that the implementation of large span bridges the importance and necessity of construction control.2,The use of MIDAS/Civil6.71 bridge dedicated to its finite element analysis software to simulate the bridge construction process analysis, including boundary conditions, weight, construction loads, prestressed load, elastic modulus and other parameters for simulation.3,In the deflection of linear control, construction set is given formula Elevation of proposed closure the main beam control precautions. And management of the gray system model to calculate the error analysis.4,Stress control, to calculate the shrinkage and creep strain and temperature resulting from the measured strain isolated from the strain, which calculated the strain caused by the actual load value.