Optimization method based on dynamic characteristic I-shaped beam section design

An I-shaped beam and section design technology, applied in the direction of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of cracking of the wing plate and web plate, threatening the structural safety, reducing the stiffness of the beam body, etc., to achieve the size of the section Excellent, accurate mechanical analysis, small effect of structural deformation

Inactive Publication Date: 2016-11-30
YANCHENG INST OF TECH
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Problems solved by technology

[0003] At present, many concrete I-beam bridges in operation have serious bridge defects, such as severe cracking of the flange and web, reduced beam body stiffness, and excessive mid-span deflection, etc., which will seriously threaten the safety of this type of structure

Method used

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  • Optimization method based on dynamic characteristic I-shaped beam section design
  • Optimization method based on dynamic characteristic I-shaped beam section design
  • Optimization method based on dynamic characteristic I-shaped beam section design

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Embodiment Construction

[0023] The above solution will be further described below in conjunction with specific embodiments. It should be understood that these examples are used to illustrate the present invention and not to limit the scope of the present invention. The implementation conditions adopted in the examples can be further adjusted according to the conditions of the specific construction and design units, and the unspecified implementation conditions are usually the conditions in routine experiments.

[0024] Specific embodiment mode:

[0025] 1. I-shaped beam vibration control differential equation and natural boundary conditions

[0026] 1.1 Setting of mechanical parameters

[0027] right figure 2 For the I-shaped section beam shown, if the span of the structure is L, in a symmetrical bending state, w(x, t) is the vertical dynamic deflection of the section, and θ(x, t) is the vertical dynamic rotation angle.

[0028] When the I-shaped beam vibrates in a steady state, its various pote...

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Abstract

The invention discloses an optimization method based on dynamic characteristic I-shaped beam section design. The method comprises the steps that deformation potential energy and kinetic energy of an I-shaped beam bridge are obtained at first, then, an energy variation method is utilized for obtaining a governing differential equation and natural boundary conditions of I-shaped beam vibration, a relevant application program is compiled based on this, and fine analysis is carried out on natural vibration characteristics of the structure through Matlab software; finally, the inherent frequency value of the I-shaped beam bridge is used as the criterion, in other words, the inherent frequency value is large, structure deformation potential energy is small, and the I-shaped beam section size is optimal, and the effectiveness of the method is further proved through the structure statics analysis. Due to the fact that mechanical analysis is accurate, the I-shaped beam bridge with the optimized section size is in a good mechanical state, and defects such as beam cracking, stiffness degradation and midspan excessive downwarping can be avoided. The optimization method is clear in mechanical conception and simple in calculation, has a good application value, and is the beneficial supplement for an existing I-shaped beam bridge design theory.

Description

technical field [0001] The invention relates to an optimization method for section design of an I-shaped girder bridge, which belongs to the technical field of bridge engineering. Background technique [0002] Due to the good mechanical properties of the I-shaped beam bridge and its advantages in prefabrication and construction, this type of structure is widely used in medium-span railways, highways and urban viaducts in China. However, the selection of a reasonable section size can keep the I-beam bridge in a good operating state, which not only reduces the maintenance and reinforcement costs of this type of structure, but also effectively improves the applicability and durability of this type of bridge. The design theory of I-shaped girder bridges is not perfect at present, and bridge diseases of this type of structure are still serious in operation. [0003] At present, many concrete I-beam bridges in operation have serious bridge defects, such as severe cracking of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 甘亚南徐兵石飞停张丹许震
Owner YANCHENG INST OF TECH
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