Superstructure Design, Construction And Finite Element Simulation Of Prestressed Concrete Continuous Box Girder Bridge

Prestressed concrete structures is the use of modern high strength materials, modern design theory and construction of advanced construction technology. Such structure has the following features: saving building materials, reducing construction costs, reduce structural weight, improve the mechanical properties of the structure to reduce structural deformation, cracking buildings and enhance the permeability type, and so increase the structural fatigue. It is the expansion of buildings and bridges and other structures of the span, reduce the height of the building floors and a corresponding increase in the number of layers is an effective way to improve economic efficiency.Prestressed concrete continuous beam bridge is a prestressed bridges, it has a good overall performance, structural rigidity, small deformation, seismic performance, particularly the main beam deflection deformation of flat, bridge expansion joints less, ride comfort, etc. advantages. Together with the design and construction of this bridge than mature, construction quality and construction period can be controlled, a small bridge after the maintenance workload. All these factors make this bridge the road, city and railway bridge construction has been widely used. This paper yingchengzi to meihekou Long Beach Freeway Interchange EK0 +372.7 overpass to the upper structure calculation and finite element analysis of the construction process.Dr. bridge analysis software with the finite element analysis to ensure the reliability of the results analysis. The basic idea of the finite element method is to solve the region contiguous to a group of a finite number of discrete and interconnected by a certain way with the unit. As the unit can be connected by a different combination of ways, and the unit itself can have different shapes, it is possible to model complex geometry of the solution domain. Finite element method as numerical analysis, another important feature is the use of each unit assumed in the approximation function to solve the sub-domain on the whole film, said to be seeking the unknown field function, cell function normally within the approximate or unknown field function and its derivative at all nodes in unit value and the interpolation function to express. This way, the problem in a finite element analysis, the unknown field function or its derivative values in each node becomes a new unknown quantity (that is, degrees of freedom). So that a continuous unlimited freedom problem into a discrete finite degree of freedom problem. Upon solving these unknowns, the interpolation function can be used to calculate each unit field function approximation, obviously with the increase of unit flexibility and improved interpolation function, the approximation solution will improve. If the unit is to meet the convergence requirements, approximate solutions will converge to exact solutions of the final. Here with Dr. prestressed hollow slab bridge the upper structure of the finite element simulation.the initial tensile force, tension force and the corresponding prestressing anchorage deformation, stress and strain using dual control, and prestressed steel beam tension steel banding requires a precise, uniform spacing, lashing formwork to be firm, stable, release agent to Brushing uniform requirement for close, pouring the template can not be loose, shifting, missed pulp, the geometry is accurate, no axis deviation.The main work of this paper are:1. Background and bridge OK.2. Bridge superstructure design theory. This part of the bridge superstructure is given reinforcement, internal force, deflection, lateral distribution of the calculation, to ensure the security and stability of the bridge.3. Dr. finite element analysis of bridges. Using finite element analysis software, Dr. bridge on the upper structure of the force analysis, as a theoretical basis.4. Given the construction program. This paper gives a continuous prestressed concrete box beam bridge construction program, and list construction considerations.This more systematic peer Prestressed Box Girder Bridges of continuous theoretical design and its finite element analysis software for structural analysis, engineering design has some guidance for future practical engineering design and calculation of certain reference value.