Analysis Of Construction Monitering Of Cantilever And The Wind Load Effect In The Large-Span Continuous Beam Bridge

The rapid development of the prestressed technique makes the large-span bridges possible. with the deep study of the calculation theory, the creep and shrinkage of concrete and the temperate, the control of bridge construction is more accurate. The technique of large-span bridge construction control should not only comply with the rules of bridge design in linear and stress,but also the requirements of safetyThe prestressed concrete continuous beam bridges are tending to the high pier and large span. Besides, this kind of bridges are usually used in gale area, and the wind load have obvious influence on the construction. The linear and stress of the bridges won’t fit the design and even bring unpredictable consequences to the construction if the wind load will be ignored. Therefore, the study of the influence of the wind load on the continuous beam bridges becoming necessary. So far, the main method for the study of the wind load influence on the bridge section is the wind tunnel experiment.This paper takes the Aierbin bridge which stretches across the Dengsha river as example and introduces the construction monitoring and the monitoring method of the continuous beam bridge. This paper also studies every typical section of the main beam and the structure of the largest cantilever and uses the software of Fluent and Midas-Civil to analyze the gale influence on the bridge sections and the structure of the cantilever. Therefore, the influence of the wind load on the continuous beam bridge can be obtained.(1) Firstly, this paper introduces some basic knowledge about continuous beam bridge including the aim and the content of the construction monitoring. Then it introduces the basic movements for simulating the three-span continuous beam bridge in using the Midas-Civil finite element software. Calculating the stress and the deflection of the bridge in every stage will provide theoretical data for the construction monitoring. The monitoring scheme should be strictly implemented in the construction and actually measure the stress of the beam and the linear in every construction stage. Then comparing the actual data and the theoretical ones is aiming to find the errors and correct them. In the construction, try to use the actual data which are nearly approaching the ideal data is a circulatory process. The theoretical stress, the actual stress, the theoretical displacement and the actual displacement all should be within the allowable limits and finally guarantee the success closure of the bridge.(2) This paper uses Fluent to simulate the changes of the coefficient with the changes of the sectional area and the angles of the wind attack and also give their charts. The stress condition of the main beam can be obtained through the analysis of the wind load of the main bean and this will provide guidance for the design and the construction of the bridge.(3) The stress and the displacement of the largest cantilever under different wind loads can be obtained through simulating the influence of the wind load on the construction process,and the reasons for this will be analyzed and compared. Knowing more about the influence of the wind load on the bridge stress and the displacement in cantilever construction can better provide help for the bridge design.