Study On Swivel Construction Monitoring And Static And Dynamic Load Test Of T-shaped Rigid Frame Bridge

With the continuous improvement of the national strength and the rapid development ofthe economy, which make our traffic engineering develop fast nowadays. Sometimes, due torestrict of terrain or traffic, the traditional method erecting bridge positions can’t be used, sothe method of bridge swivel construction emerges, avoiding the traffic problems in theconstruction period. The bridge engineers and experts conduct bold innovation and scientificattempt to make this construction method be applied in various types of bridges. Because ofthe advantages of bridge swivel construction, the construction can be completed fast andsafely without affecting the local traffic, which can well meet the needs of modern traffictechnology and economic development. Therefore, the bridge swivel construction will have abroader space for development in both engineering and scientific fields.This paper studies the swivel construction of T-shaped rigid beam bridge, taking theShenyang Fourth Ring Expressway across the Qin-Shen passenger grand bridge as theexample. Studying the mechanical properties in each stage of construction process of thebridge and deflection factor affecting the rigid frame bridge; further verifying the static anddynamic properties by the static and dynamic load tests. In this paper, the main works include:First, using MIDAS CIVIL software to simulate the construction process of the bridge, inorder to make bridge design meet the requirements of the force performance and effectivelycontrol the linear and force of bridge, and to ensure bridge smoothly twist and fold, It isneeded to analyze the force of T-shaped rigid beam bridge throughout the construction phase.Secondly, the various factors affecting bridge deflection are first be analyzed by theory,gradually discussing and analyzing the impact situation of various factors on the deflection.Itis found that the prestressed loss is the main cause making bridge deflection increase, theinteraction of prestressed reinforced relaxation and concrete shrinkage creep will promote theprestressed losses. By calculating the influence of prestressed losses and bridge thin-walledpile stiffness, it can be found that when the prestressing loss is larger, the deflection of mainbeam will be great, and which propose suggest for construction and design of the future Tbeam bridge. Finally, through analyzing the data of static and dynamic load test, andcomparing with computer simulation data, the test results show that: static load tests showthe deformation characteristics and strain characteristics of the bridge span structures arenormal under static load, the overall mechanical properties of the bridge span structures meetrequirements of the highway gradeⅠ load. The deformation characteristics and structuredynamic characteristics(natural frequency, damping, etc.) of the bridge span structures arenormal under dynamic loading, its overall stiffness is good, but also it shows that the materialselected for the structure meet the design requirements, the overall performance and working conditions of the structure are good. which provide relevant information for maintenance,repair and operation health monitoring systems of future bridge.