The Research And Artificial Analysis Construction Controlling Of Longspan Rigid-Frame Continuous Bridge

By taking the Baima River Bridge as a project background, finite element calculative model can be built, and then the construction process of prestressed concrete continuous rigid-frame is simulated and calculated, stress deflection and internal force under each working condition in every construction step can be receive,so a set of theoretic datas are provided for checking and controlling of Baimahe Bridge, and insuring to carry out successfully the construction control of the bridge. During the calculation and analysis in theory, the selection of calculative model and use of calculative parameters should try to reflect the reality of construction process of bridge, so which conduct bridge construction.By sensitivity analysis of many construction paramenters under the largest cantilever state, Bulk density is the first; modulus of elasticity is the second; pipeline deviation coefficient is little smaller; and pipeline friction coefficient is the most unsensitive.Sensitivity analysis of many parameters are researched when the bridge is completed, it is known that prestressed force, self-weight, concrete shrinkage and creep, temperature influence deflection and stress of main girder dramatically.Parameters that influence dramatically must be controlled strictly, and be adjusted during theoretic calculation according to actual parametric characteristics. In this page, the impact of bridge constructione of nvironmental changes in the relative humidity is researched. It is discovered that the greater the relative humidity of ervironment, the small the impact of bridge construction, instead, the impact is greater. The influence of temperature is different from the other parameters, which change with temperature, and influences the deflection of bridge, so must be modified or obviated during the construction. The construction process is very complex for long-span continuous rigid-frame bridge, and bridge status will be influenced by many parameters, so the quality and safety of the bridge can be guaranteed by effective construction control.The introduction and summary of background engineering project are presented in this thesis. By effective construction control, the line font and strain of bridge can be identical with theory value fine when project is completed in order to insure the safety of bridge construction.There are 103 figures,20 tables and 60 reference catalog.