Parameter Identification Method And Prestressed Bridge Construction In The Control Of Additional Loss

With the development of science technology and traffic enterprise,the continuous rigid frame bridge has been growing up rapidly in the recent years with it's unique predominance of handy construction,economical cost,reasonable internal force and comfortable traveling. It almost has become the first selective bridge style When the main span is in the range from 200m to 300m. But the theories and experience in it are not very perfect because of it's short appearance. There are still several questions in the construction. The paper introduced the importance of prestress losses and its determination in prestressed concrete structures.In recent years the genetic algorithms has become a Striking research topic in china and abroad. It is generally believed that development in this field will bring significant outcomes and great promise for application. Relying on the Caidian bridge,in this paper a genetic algorithm is applied in identifying the pre-stress loss of the long span bridge. A model with some parameters is made to assess the pre-stress loss. Based on the differences between the design value and the survey of the bridge deck elevation in constructing the pre-stressed long span bridge,the model parameters are identified by the genetic algorithm,and the pre-stress loss values of different sections are given. It is demonstrated that the genetic algorithm is efficient and the theoretical results fit well with the stress survey.In this thesis,aim to the beam axis shape be exactitude for design,the internal force of the beam be appeased by design request,the concept of modem cybernetics is applied,genetic algorithms is applied in the construction control of Prestressed Concrete Continuous Rigid Frame' Bridge. It is successful for used in Caidian Bridge in Wuhan. On the bridge construction control technique,attempted a new method.