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Assessment method for residual stress relaxation effect of steel box girder top plate-longitudinal rib welding details

A technology of residual stress relaxation and residual stress, applied in special data processing applications, instruments, calculations, etc., to achieve good practical value, efficient calculation, and simple modeling

Active Publication Date: 2019-09-20
南京毕慕智能建筑科技有限公司
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Problems solved by technology

However, most of the calculations only consider the vehicle load, and it is debatable whether the real stress ratio at the weld is much smaller than -1 under the coupled action of welding residual stress and vehicle stress

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  • Assessment method for residual stress relaxation effect of steel box girder top plate-longitudinal rib welding details
  • Assessment method for residual stress relaxation effect of steel box girder top plate-longitudinal rib welding details
  • Assessment method for residual stress relaxation effect of steel box girder top plate-longitudinal rib welding details

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0032] This embodiment provides a method for evaluating the residual stress relaxation effect of steel box girder roof-longitudinal rib welding details under the action of vehicles, such as figure 1 As shown, the method includes the following steps:

[0033] Step 1. Establish a solid model of the roof-longitudinal rib, and use the finite element analysis software ANSYS to perform a simulation analysis of the residual stress of the roof-longitudinal rib welding details on...

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Abstract

The invention discloses an assessment method for residual stress relaxation effect of steel box girder top plate-longitudinal rib welding details under a vehicle-mounted effect. The method comprises the following steps: establishing a top plate-longitudinal rib solid model, and carrying out simulation analysis on top plate-longitudinal rib welding detail residual stress by using finite element analysis software; verifying a simulation result through a top plate-longitudinal rib test piece residual stress experiment; embedding the top plate-longitudinal rib solid model into the steel box girder shell unit model to obtain a steel box girder solid-shell model; loading a verified simulation result serving as an initial load to the steel box girder entity-shell model, and setting a material cyclic plasticity constitutive relation; and on the basis, applying a vehicle load to the steel box girder entity-shell model, and obtaining the top plate-longitudinal rib welding detail residual stress relaxation degree through calculation. The method can be used for objectively and accurately evaluating the residual stress relaxation level of the steel box girder top plate-longitudinal rib welding details under the vehicle-mounted effect, and is greatly helpful for the anti-fatigue design of a large orthotropic steel bridge deck and the fatigue life prediction of the welding details.

Description

technical field [0001] The invention belongs to the field of fatigue analysis and design of steel bridge decks of long-span bridge structures, and in particular relates to a method for evaluating the residual stress relaxation effect of steel box girder roof-longitudinal rib welding details under the action of vehicles. Background technique [0002] Orthotropic steel decks are the preferred deck structure for long-span bridges. However, with the increase of the service life of bridges, fatigue problems of steel bridge decks generally appear, causing significant economic losses and adverse social impacts. Therefore, the fatigue design of orthotropic steel bridge decks is particularly important. The fatigue design codes of steel bridges at home and abroad generally use the S-N curve of welding details for fatigue design, that is, the main factor of fatigue design is the stress amplitude, and the influence of the stress ratio is ignored. This is because, due to the high weldi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23G06F2119/06Y02P10/20
Inventor 钟雯
Owner 南京毕慕智能建筑科技有限公司
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