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

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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Problems solved by technology

For these new structural details, it is often necessary to verify their fatigue resistance through full-scale or scaled-scale model fatigue tests, which consumes a lot of manpower, material resources and financial resources.

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