Determination method for steel bridge structure detail S-N curve considering welding residual stress

A residual stress and curve technology, applied in the field of determining the S-N curve of steel bridge structure details, can solve the problems of consuming manpower, material resources and financial resources, and achieve the effect of anti-fatigue design safety and shortening the test cycle

Active Publication Date: 2017-08-29
WUHAN UNIV OF TECH
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Problems solved by technology

For these new structural details, it is often necessary to verify their fatigue resistance through full-scale or

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  • Determination method for steel bridge structure detail S-N curve considering welding residual stress
  • Determination method for steel bridge structure detail S-N curve considering welding residual stress
  • Determination method for steel bridge structure detail S-N curve considering welding residual stress

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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0031] In a preferred embodiment of the present invention, as Figure 6 As shown, a method for determining the S-N curve of steel bridge construction details considering welding residual stress includes the following steps:

[0032] S1. Obtain the welding residual stress σ of the structural details of the steel bridge res ;

[0033] S2. Obtain the material S-N curve correction formula considering the welding residual stress:

[0034] S201, select the S-N curve of the material: lgN+mlgσ=C (1), in the formula, N is the fatigue number, σ is the fatigue strength, and m and C are constants related to...

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Abstract

The invention discloses a determination method for a steel bridge structure detail S-N curve considering welding residual stress. The method includes the following steps that the welding residual stress of steel bridge structure details is acquired through a thermal-structural coupling analysis method; the influences of mean stress on structure fatigue strength are considered through a Goodman formula, and a material S-N curve correction formula considering the welding residual stress is derived; the fatigue life of structure detail weld toes under different stress level fatigue loads is calculated according to the material S-N curve considering the welding residual stress, the corresponding relationship between structure detail nominal stress and the fatigue life of the weld toes is established, and the steel bridge structure detail S-N curve considering the welding residual stress is acquired. The influences of welding residual stress specific values on steel bridge structure detail fatigue characteristics are considered, the anti-fatigue design of a steel bridge is safer, and traditional full-size or reduced-scale fatigue model tests consuming a large quantity of manpower, material resources and financial resources are avoided.

Description

technical field [0001] The invention belongs to the technical field of bridge and culvert engineering in the transportation industry, and in particular relates to a method for determining the S-N curve of steel bridge structural details in consideration of welding residual stress. Background technique [0002] Due to the uneven heating and cooling of the welding process during the welding construction of the steel bridge, welding residual stress will inevitably be generated. Their existence is often an important factor in the formation of welding cracks, which will significantly reduce the strength and fatigue life of the structure. However, the nominal stress S-N curves of some typical structural details given in the current codes do not consider the specific value of the welding residual stress, because there are great differences between the actual structural welding materials, welding processes, structural dimensions, etc., and the test members in the codes , so that the...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23
Inventor 刘沐宇邓晓光卢志芳罗洪界
Owner WUHAN UNIV OF TECH
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