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Construction method of one-dimensional finite element model of curved steel-concrete combined box girder

A construction method and technology of combination boxes, which are applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve problems such as constraint torsion and distortion effects that cannot be ignored, and bidirectional interface slip of curved composite beams not considered.

Active Publication Date: 2019-07-16
BEIJING JIAOTONG UNIV
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Problems solved by technology

However, none of the above studies considered the two-way interface slip of curved composite beams. In addition, literature [17] conducted a large number of theoretical analyzes on the torsional and distortion behaviors of curved steel box girders. The proportion of can be up to 34%. It can be seen that for the curved box girder bridge, the restrained torsion and distortion effects cannot be ignored at all.

Method used

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  • Construction method of one-dimensional finite element model of curved steel-concrete combined box girder
  • Construction method of one-dimensional finite element model of curved steel-concrete combined box girder
  • Construction method of one-dimensional finite element model of curved steel-concrete combined box girder

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Embodiment Construction

[0136] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0137] Such as figure 1 with 2 As shown, the construction method of the curved steel-concrete composite box girder one-dimensional finite element model of the present invention comprises the following steps:

[0138] 1 Make basic assumptions:

[0139] (1) The concrete slab has a rectangular cross-section and has the same curvature as the steel beam in the undeformed structure;

[0140] (2) The vertical displacement of the concrete slab and steel beam is always the same;

[0141] (3) The radius of curvature remains constant along the length of the beam;

[0142] (4) The shear connection between the steel beam and the concrete slab is flexible in both tangential and radial directions;

[0143] (5) The section size of the box girder is much smaller than the span, that is, the change of the radius of curvature in the beam width direction is ignored;

[0144...

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Abstract

The invention relates to a construction method of one-dimensional finite element model of a curved steel-concrete combined box girder. The invention provides a theoretical model considering warping, distortion and slippage of a curved steel-concrete combined box girder. Each unit divided by the finite element in the model comprises 22 degrees of freedom, including radial displacement, vertical displacement, tangential displacement, torsion angle and distortion angle of the curved beam, relative sliding of the interface of the steel beam and the concrete slab and the like. A balanced equation of the curved steel-concrete combined box girder is constructed through the virtual work principle, and a rigidity matrix and an equivalent load matrix of the curved steel-concrete combined box girderis given.

Description

technical field [0001] The invention relates to the technical field of bridges, in particular to a method for constructing a one-dimensional finite element model of a curved steel-concrete composite box girder. Background technique [0002] Curved steel-concrete composite box girder has the advantages of light weight, strong spanning capacity, and high torsional rigidity, and has been gradually and widely used in the construction of urban highway overpasses and ramp bridges. Compared with straight beams, the overall center of mass of curved composite box girders is not located on the support line, so it has typical bending-torsion coupling force characteristics under vertical loads such as self-weight and vehicles. When the structure is torsion, the section will undergo obvious longitudinal warping and distortion deformation, and the interface will also have unique longitudinal and lateral sliding behavior. Therefore, the mechanical characteristics of the curved composite b...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23
Inventor 朱力李明杰季文玉李轩
Owner BEIJING JIAOTONG UNIV
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