Reaserch On The Construction Monitoring Of The Prestressed Concrete Continuous Rigid Frame Bridge

In recent years, with the rapid development of our traffic and the increasing capacity of the bridge construction, the prestressed concrete continuous rigid frame bridge,which is the long-span bridge,has received more and more attention and a wide range of applications in bridges field as result of its unique advantages of low cost, comfortable driving conditions, convenient maintenance and high durability. The prestressed concrete bridge construction process is long and complex, in order to ensure the reasonable control of the internal forces, the precision of the closure and the consistency between the bridge line shape and the design line shape, construction monitoring work must be carried out in the bridge construction stage.This paper provides an overview of the prestressed concrete continuous rigid frame bridge structure, mechanical advantages, significance of its monitoring and development overview.Then, it elaborates the contents of construction control, control methods, influencing factors, the composition of construction control system, the way of simulating and analyzing construction process and the necessity of the construction control checking in detail. Through the project of Bazhong Hui Feng Bridge and its actual situation (project overview, structural and construction features), this paper discourses the design of the monitoring program (including construction control system, field testing, and measurements of the line shape, stress, settlement of foundation and temperature field of main beams in real time), timely recording of monitoring results and analysis. Finally,the paper discusses the value of the concrete creep coefficient which greatly influences structures.In the above process, with the help of large finite element software Midas/Civil2010, this paper simulates the actual bridge, introduces the steps of analysis of the construction phase, eigenvalue analysis and the PSC design and analyzes the sensitivity of the parameters. It also scientifically and effectively forecasts the errors of the line shape,and then guide the construction through the grey theory.