An evaluation method for fatigue performance of steel pipe welded intersecting joints

Abstract

The invention relates to an evaluation method for fatigue performance of a steel pipe welding intersecting joint. The area of the contact face of a welding line in the steel pipe welding intersecting joint and a main pipe and the area of the contact face of the welding line in the steel pipe welding intersecting joint and a branch pipe are adopted as evaluation indexes of the fatigue performance of the steel pipe welding intersecting joint; and the area of the contact face of the welding line in the steel pipe welding intersecting joint and the main pipe and the area of the contact face of the welding line in the steel pipe welding intersecting joint and the branch pipe are calculated and compared, and the small value is taken for evaluating the fatigue performance of the steel pipe welding intersecting joint. According to the evaluation method, all current evaluation indexes for the fatigue performance of the steel pipe welding intersecting joint can be comprehensively taken into consideration, and the fatigue performance of the steel pipe welding intersecting joint is evaluated more reasonably.

Description

technical field [0001] The invention relates to the field of steel pipe welding, in particular to a method for evaluating the fatigue performance of welded intersecting joints of steel pipes. Background technique [0002] Steel pipe welding intersecting joints have the characteristics of clear force transmission, good mechanical performance, strong bearing capacity, light and beautiful building appearance, and are widely used in bridges, buildings and other fields. However, with the increase of the service life of steel pipe welded intersecting joints, especially in the environment of long-term repeated live load, the fatigue problem of steel pipe welded intersecting joints is prominent. Concrete-filled steel tube truss arch bridges—Yajisha Bridge and Shitanxi Bridge were opened to traffic for 10 years and 16 years respectively, and fatigue cracking of steel tube welded joints appeared. [0003] The current evaluation indicators for the fatigue performance of welded interse...

AI Technical Summary

Problems solved by technology

However, when a single index is used to evaluate the fatigue performance of steel pipe welded intersecting joints, the potential cross-relationship between various evaluation indexes is ignored, that is, changing one of the evaluation indexes will cause changes in other evaluation indexes

For example, when the ratio β of the diameter of the branch pipe to the diameter of the main pipe is used for evaluation, the ratio γ of the diameter of the main pipe to the wall thickness of the main pipe will change

Therefore, the current evaluation method uses a single index to evaluate the fatigue performance of steel pipe welded intersecting joints, which cannot fully grasp the fatigue performance of steel pipe welded intersecting joints, and may appear contrary to the designer's expectations for the fatigue performance of steel pipe welded intersecting joints

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