Finite element analysis method for temperature action on prestressed reinforced concrete continuous rigid frame bridge

Abstract

The invention provides a finite element analysis method for the temperature action on a prestressed reinforced concrete continuous rigid frame bridge. The finite element analysis method is used for analyzing and calculating the stress and displacement distribution in the construction and finished bridge stage under different temperature gradient models, and provides references for designing and optimizing the prestressed reinforced concrete continuous rigid frame bridge. Through calculational analysis based on finite elements and the structural mechanics, the forward-calculation method is adopted for structural distortion and stress analysis according to the actual construction loading sequence of the bridge structure, so that the complex mechanics problem of box girder temperature self-stress, temperature secondary internal force in a prestressed reinforced concrete statically indeterminate structure and secondary stress of the temperature secondary internal force is solved easily, conveniently and efficiently, and the finite element analysis method has important practical value.

Description

technical field [0001] The present invention relates to a prestressed analysis method, in particular to a finite element analysis method for the temperature action of a prestressed concrete continuous rigid frame bridge. The generalized node displacement on each node is obtained by solving the finite element equation, and the generalized node displacement is used on each unit. Displacement, stress, strain and other physical quantities can be obtained by interpolation of node displacement. Background technique [0002] In recent years, the transportation industry has developed rapidly, and the strength of concrete is getting higher and higher. The span of the prestressed concrete continuous rigid frame bridge built by the cantilever segment by segment construction method is getting larger and larger. Due to the poor thermal conductivity of concrete materials, under various temperature changes, considerable stress, deformation, and even temperature cracks will occur inside the...

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Problems solved by technology

[0003] In the existing design practice, due to the complexity of structural analysis, the existing calculation is lengthy. Although the designer subjectively hopes to optimize the structural design as much as possible, on the one hand, there is a lack of effective calculation methods; on the other hand, there is a lack of systematic method guidance Bridge structural design and improved structural design, so that the design optimization of the structure mainly depends on the accumulated engineering experience, which makes the existing design process have greater subjectivity, and the workload is heavy and the design cycle is long. Therefore, it is urgent to optimize the existing On the premise of reducing the calculation amount, the structural deformation and force analysis are carried out according to the actual construction loading sequence of the bridge structure, and the temperature self-stress of the box girder and the temperature in the statically indeterminate prestressed concrete structure are effectively calculated. Secondary internal force and secondary stress

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